Free Online Calculator: Basic and Scientific

Keyboard Shortcuts — Basic & Scientific Calculator

How to Use the Online Calculator?

Basic, scientific, and scientific calculator—everything you need to know to use the calculator effectively, with concrete examples at every step.

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📱 How do you use the Simple (Basic) Calculator?

The basic calculator lets you quickly perform everyday calculations: adding up a bill, dividing to split a cost, or calculating percentages for a store discount. It’s simple, fast, and requires no special knowledge.

Choose the Mode — Basic or Scientific

At the top of the calculator, two buttons let you choose the calculation mode. The active button is displayed in blue; the inactive button is gray. For simple calculations, Basic mode is always sufficient.

Basic Mode — When to Use It

Basic — For everyday calculations: groceries, paychecks, bills, sales tax, splitting expenses with friends.

Scientific Mode — When to Use It

Scientific — For advanced calculations: trigonometry, square roots, logarithms, powers. Used in academic studies or engineering.

💡 Tip: If you’re calculating the total of a bill, a tip, or a discount, stay in Basic mode. Scientific mode is reserved for technical calculations.

The Display Screen

The black screen at the top of the calculator displays the numbers you enter and the results of your calculations in real time. It also shows the operation in progress before you press the equals button.

How It Works

Each number you enter appears immediately on the screen. When you select an operation (e.g., +), the screen stores the first number. After you enter the second number and press =, the final result is displayed.

Example: You type 5 + 3 → the screen first displays 5, then 3, and after pressing =, it displays 8.

🧮 Tip: If the screen displays a result you don’t recognize, it may be a carryover from a previous calculation. Press AC to start over.

Calculator Size (S, M, L)

In the top right corner of the calculator, three buttons let you change its size. Both the calculator and the notepad change size together. By default, size M (Medium) is selected.

S — Small size

The S button reduces the size of the calculator and the notepad. Useful on a smaller screen or to take up less space on the screen.

Used for: Saving space on the page, quick reference.

M — Medium size (default)

The M button displays the calculator and notepad at their standard size. This is the default size when the page opens.

Used for: Comfortable everyday use, balancing readability and space.

L — Large size

The L button enlarges the calculator and notepad for better readability, especially on large screens.

Used for: Better visibility of buttons and text; comfort when using a computer.

Undo and Redo

These two buttons let you navigate through your action history, just like in standard office software.

Undo

Click the Undo button to return to the previous step and correct an action performed by mistake.

Used for: Going back after an accidental entry or deletion.

Redo

Click the Redo button to restore the last action you undid and return to the next state.

Used for: Restoring an action after accidentally using Undo.

The Memory Buttons (MC, MR, M+, M−)

The memory buttons allow you to temporarily save a number and reuse it later in another calculation without having to retype it. Very useful when performing a series of related calculations.

MC — Memory Clear

Completely clears the number stored in memory. After pressing MC, the memory is empty.

Example: You have stored 100 in memory. You no longer need it → press MC → the memory is cleared.
Used for: Starting with a clean memory before a new series of calculations.

MR — Memory Recall

Displays the number currently stored in memory on the screen so you can use it in the current calculation.

Example: You have stored 250 in memory. Later, you want to add it to 80 → press MR → the screen displays 250, then + 80 = → result: 330.
Used for: Reusing an intermediate result in a subsequent calculation.

M+ — Memory Plus (Add to Memory)

Adds the number displayed on the screen to the number already in memory. Allows you to accumulate multiple values without retyping.

Example: Memory = 20. You calculate 15 + 10 = 25, then press M+ → the memory changes from 20 to 45.
Used for: Adding partial results, such as the total of several separate receipts.

M− — Memory Minus (Subtract from memory)

Subtracts the number displayed on the screen from the number already in memory.

Example: Memory = 100. You display 30 and press M− → the memory changes to 70.
Used for: Deducting expenses from a saved budget, calculating a balance after deduction.

Essential Buttons

These buttons control number entry and allow you to correct or reset a calculation in progress. It’s important to know them before you begin.

AC — Clear everything and start over

The AC button immediately clears everything on the display and resets the calculator to zero. Useful when you’ve made a mistake and want to start over.

Example: You started typing 250 + 30 but made a mistake at the beginning → press AC to clear everything and retype from the start.
Used for: Correcting a completely wrong calculation, or starting a new calculation with no trace of the previous one.

± — Change the sign of a number

The ± button flips a positive number to negative, or a negative number to positive, with a single press.

Example: You type 5 and then press ± → the screen displays −5. Press it again → it returns to 5.
Used for: Calculating losses, debts, subzero temperatures, or subtracted values.

% — Percentage

Automatically calculates a percentage of a number without having to divide by 100 manually.

Example 1: 20% discount on an item priced at 150 € → type 150 × 20% → result: 30 € discount.
Example 2: 20% VAT on €500 → result: €100 in VAT.
Used for: Discounts, VAT, interest, commissions, tips.

← — Delete the last digit

The ← button deletes only the last digit entered, without clearing the entire calculation. Perfect for correcting a small typing error.

Example: You meant to type 258 but accidentally typed 2589 → press ← once → the screen now displays 258.
Used for: Correcting only the last digit without starting over.

0 to 9 — Entering Numbers

The 0 through 9 keys are used to enter numbers. Press the digits in order to form the desired number.

Example: To enter 786, press 7, then 8, then 6.
Used for: Entering any whole number into a calculation.

. — Decimal point (decimal numbers)

The . button lets you enter numbers with decimals.

Example: To calculate 12.5 + 1.5 → type 12.5, then +, then 1.5, then = → result: 14.
Used for: Prices (e.g., 3.99 €), measurements (e.g., 1.75 m), precise quantities.

Mathematical Operations

These six buttons cover all the basic mathematical operations. They are always used between two numbers: enter the first number, select the operation, enter the second number, then press =.

+ — Addition

Adds two numbers together to get their total.

Example: You bought one item for 35 € and another for 48 € → type 35 + 48 = → result: 83 €.
Used for: Totaling expenses, adding quantities, calculating a budget.

− — Subtraction

Subtracts one number from another to find the difference or what’s left.

Example: You have 200 € in your pocket and you spend 75 € → type 200 − 75 = → result: 125 € remaining.
Used for: Calculating a remainder, savings, a loss, or an account balance.

× — Multiplication

Multiplies two numbers to get their product. Useful for repeating a quantity multiple times.

Example: You buy 6 bottles at €2.50 each → type 6 × 2.5 = → result: €15.
Used for: Calculating a total based on a quantity, an area (length × width), or an hourly wage.

÷ — Division

Divides one number by another to find a share or a quotient. Perfect for dividing something equally.

Example: A restaurant bill of 120 € for 4 people → type 120 ÷ 4 = → result: 30 € per person.
Used for: Dividing a sum, calculating a unit price, converting units.

= — Display the final result

Pressing = starts the calculation and displays the result on the screen. This result is automatically saved in the history at the bottom of the page.

Example: Type 9 + 1, then = → the screen displays 10.
Used for: Finishing each calculation and getting the final answer.

🧮 Complete example: Calculate 3 ÷ 5 → press 3 ÷ 5 = → result: 0.6. This result represents 60% of 1, or €0.60, or 60 cm, depending on the context.

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🔬 How to Use the Scientific Calculator?

The scientific calculator is designed for advanced calculations in mathematics, physics, chemistry, and engineering. It includes all the functions of a basic calculator, plus trigonometric and logarithmic functions, powers, roots, and mathematical constants.

Enable Scientific Mode

Click the Scientific button at the top of the calculator. The button turns blue and new keys appear. All basic functions remain available.

🔬 Tip: Scientific mode works just like basic mode—enter your number, select the function, and press =. There are no different steps.

DEG / RAD / GRAD Mode (Angle Units)

This button lets you choose the unit used for trigonometric calculations. With each click, the mode changes in the following order: DEG (degrees) → RAD (radians) → GRAD (grades) → then back to DEG.

DEG / RAD / GRAD — How It Works

The currently active mode is displayed in small text at the top left of the calculator screen, so you always know which unit your angles are calculated in.

DEG — degrees (0° to 360°), the most common system used in middle school, high school, and college.
RAD — radians (0 to 2π), used in mathematical analysis and physics.
GRAD — grades (0 to 400 gr), used in surveying and civil engineering.

Example: sin(90°) = 1 in DEG mode. The same calculation yields a different result in RAD or GRAD mode, since the angle is no longer expressed in the same way.
Used for: All angle calculations—geometry, physics, surveying, and cartography.

F-E — Scientific Notation

F-E — Scientific Notation

The F-E button displays a number in scientific (exponential) notation, which is useful for very large or very small numbers.

Example: 1,000,000 → 1E+6. 0.000001 → 1E-6.
Used for: Physics, astronomy, chemistry, molecular biology.

mod — Modulo

mod — Modulo

The mod button calculates the remainder of a division.

Example: 10 mod 3 = 1. 25 mod 4 = 1. The result represents the remainder after division.
Used for: Divisibility, cryptography, programming, cyclic scheduling.

Ans — Last Answer

Ans — Last Answer

The Ans button automatically retrieves the last calculated result, so you don’t have to re-enter it.

Example: 5 + 5 = 10, then Ans × 2 = 20.
Used for: Performing a series of calculations that depend on the previous result.

x² — Square

x² — Square (multiply by itself)

Calculates the square of a number, that is, the number multiplied by itself.

Example: 5² = 5 × 5 = 25. The area of a square with a side length of 5 cm is 25 cm².
Used for: Areas of squares and rectangles, physics formulas (kinetic energy: ½mv²).

x³ — Cube

x³ — Cube (3rd power)

Calculates the cube of a number, that is, the number multiplied by itself three times.

Example: 3³ = 3 × 3 × 3 = 27. The volume of a cube with a side length of 3 cm is 27 cm³.
Used for: Volumes of cubes, capacity calculations, formulas in chemistry and physics.

xʸ — Custom power

xʸ — Custom Power

Raises a number to any power you choose. Type the number, then xʸ, then the power, then =.

Example: 2 xʸ 10 = 2¹⁰ = 1024. Useful in computer science and for calculating compound interest.
Used for: Exponential growth, bank interest, computer science calculations.

eˣ — Exponential

eˣ — Exponential with base e

This function calculates e raised to the power of x, i.e., natural exponential growth.

Example: e² ≈ 7.389. e³ ≈ 20.086.
Used for: Mathematics, statistics, and finance—calculations involving continuous growth.

10ˣ — Power of 10

10ˣ — Power of 10

Calculates 10 raised to the power you enter. Allows you to quickly write very large or very small numbers.

Example: 10³ = 1,000. The speed of light is approximately 3 × 10⁸ m/s.
Used for: Physics, chemistry, astronomy, scientific notation.

( ) — Parentheses

( ) — Parentheses (order of operations)

Parentheses are used to define the order in which operations are performed. The content inside parentheses is calculated first.

Example: 5 + 3 × 2 = 11. (5 + 3) × 2 = 16.
Used for: Any complex formula where the order of calculation is important.

√x — Square root

√x — Square root

Calculates the square root of a number—that is, the number that, when multiplied by itself, equals the result.

Example: √25 = 5, because 5 × 5 = 25. A square room measuring 36 m² has sides of √36 = 6 m.
Used for: Geometry, the Pythagorean theorem, statistics (standard deviation).

n! — Factorial

n! — Factorial

Calculates the product of all integers from 1 up to the entered number.

Example: 5! = 5 × 4 × 3 × 2 × 1 = 120.
Used for: Probability, combinatorics, arrangements, permutations.

ln — Natural logarithm

ln — Natural logarithm (base e)

Calculates the natural logarithm of a number, to base e (≈ 2.71828).

Example: ln(e) = 1. ln(1) = 0.
Used for: Bacterial growth, radioactive decay, financial calculations, thermodynamics.

log — Logarithm to base 10

log — Logarithm to base 10

Calculates the logarithm of a number to base 10: “What power of 10 is this number?”

Example: log(100) = 2, because 10² = 100. log(1000) = 3, because 10³ = 1000.
Used for: Sound measurement (decibels), the Richter scale, pH in chemistry, acoustics.

sin — Sine

sin — Sine

Calculates the ratio of the opposite side to the hypotenuse in a right triangle.

Example: sin(30°) = 0.5 — this means that in a triangle with a 30° angle, the opposite side is half the length of the hypotenuse.
Used for: Calculations of height, slope, sound waves, and electrical signals.

cos — Cosine

cos — Cosine

Calculates the ratio of the adjacent side to the hypotenuse in a right triangle.

Example: cos(60°) = 0.5 — in a triangle with a 60° angle, the adjacent side is half the length of the hypotenuse.
Used for: Calculations involving horizontal distance, projection, navigation, and architecture.

tan — Tangent

tan — Tangent

Calculates the ratio of the opposite side to the adjacent side in a right triangle.

Example: tan(45°) = 1, tan(0°) = 0 — at 45°, the two sides are equal.
Used for: Calculating a slope, a roof pitch, and an angle of ascent.

π — Pi

π — Pi (circular constant)

π is the constant that represents the ratio of a circle’s circumference to its diameter. Its value is fixed: 3.14159…

Example: Area of a circle with radius 5: π × 5² = 78.54.
Used for: Calculations involving circles, cylinders, spheres, waves, and oscillations.

e — Euler's number

e — Euler’s number (natural constant)

e is a fundamental mathematical constant equal to 2.71828…, the base of the natural logarithm.

Example: Principal invested at 100% continuous interest over 1 year: 1 × e ≈ 2.718 times the initial principal.
Used for: Exponential growth, biology, finance, wave physics.

sinh, cosh, tanh — Hyperbolic functions

sinh — Hyperbolic sine

Calculates the hyperbolic sine of a number, used in functions based on the exponential curve rather than the circle.

Example: sinh(1) ≈ 1.175.
Used for: Physics, engineering, the shape of suspended cables (chains).

cosh — Hyperbolic cosine

Calculates the hyperbolic cosine of a number.

Example: cosh(1) ≈ 1.543.
Used for: Physics, engineering, thermodynamics.

tanh — Hyperbolic tangent

Calculates the hyperbolic tangent of a number.

Example: tanh(1) ≈ 0.762.
Used for: Statistics, neural networks, engineering sciences.

2nd Button — Advanced Functions

The 2nd button activates the secondary and advanced functions of the scientific calculator. After pressing this key, new functions become available in place of the usual functions: absolute value, inverse functions, advanced roots, specialized logarithms, inverse trigonometric functions, and inverse hyperbolic functions.

|x| — Absolute value

|x| — Absolute Value

The |x| button calculates the absolute value of a number—that is, its distance from zero, which is always positive.

Example: |-5| = 5.
Used for: Distances, deviations, error calculations.

1/x — Inverse of a number

1/x — Inverse of a number

The 1/x button calculates the inverse of a number, that is, 1 divided by that number.

Example: 1/4 = 0.25.
Used for: Electronics (parallel resistors), optics, frequency calculations.

ʸ√x — yth root

ʸ√x — yth root

This function calculates the yth root of a number.

Example: ³√27 = 3.
Used for: Advanced mathematics, solving equations.

2ˣ — Power of 2

2ˣ — Power of 2

This function raises 2 to the power of x.

Example: 2³ = 8.
Used for: Computer science (bytes, powers of 2), binary growth.

log₂x — Base-2 logarithm

log₂x — Logarithm to base 2

This function calculates the base-2 logarithm of a number.

Example: log₂(8) = 3.
Used for: Computer Science, Information Theory, Algorithms.

∛x — Cube root

∛x — Cube root

This function calculates the cube root of a number—that is, the number that, when multiplied by itself three times, equals the given number.

Example: ∛125 = 5.
Used for: Volume calculations, cube dimensions, chemistry of solutions.

rand — Random number

rand — Random number

The rand button generates a random number between 0 and 1 each time it is pressed.

Example: Possible result: 0.384721. The result changes each time it is used.
Used for: Mathematical simulations, statistics, random experiments.

logᵧx — Logarithm to a custom base

logᵧx — Logarithm to base y

This function calculates the logarithm of x to base y.

Example: log₂(32) = 5.
Used for: Advanced mathematics, computer science, and science.

sin⁻¹ — Arc sine

sin⁻¹ — Arc sine

This function calculates the angle whose sine is known—the inverse of the sine.

Example: sin⁻¹(0.5) = 30°.
Used for: Finding an unknown angle based on known measurements in a triangle.

cos⁻¹ — Arc cosine

cos⁻¹ — Arc cosine

This function calculates the angle whose cosine is known—the inverse of the cosine.

Example: cos⁻¹(0.5) = 60°.
Used for: Geometry, navigation, architecture.

tan⁻¹ — Arc tangent

tan⁻¹ — Arc tangent

This function calculates the angle whose tangent is known—the inverse of the tangent.

Example: tan⁻¹(1) = 45°.
Used for: Calculating slope, inclination, and angle of ascent.

sinh⁻¹, cosh⁻¹, tanh⁻¹ — Inverse hyperbolic functions

sinh⁻¹ — Inverse hyperbolic sine (arsinh)

This function calculates the inverse hyperbolic sine of a number.

Example: sinh⁻¹(1) ≈ 0.881.
Used for: Physics, engineering, cable and chain calculations.

cosh⁻¹ — Inverse hyperbolic cosine (arcosh)

This function calculates the inverse hyperbolic cosine of a number.

Example: cosh⁻¹(2) ≈ 1.317.
Used for: Physics, engineering, thermodynamics.

tanh⁻¹ — Inverse hyperbolic tangent (artanh)

This function calculates the inverse hyperbolic tangent of a number.

Example: tanh⁻¹(0.5) ≈ 0.549.
Used for: Statistics, neural networks, engineering sciences.

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📝 Calculation Notepad

The notepad is a space next to the calculator where you can freely write notes, then save or export your calculations and comments.

Edit

Edit

Click the Edit button to write freely in the notepad. Then click Save to save your notes.

Used for: Adding personal comments, organizing your calculations by category.

CSV

CSV — Export to Excel

Click the CSV button to download your calculation history in CSV format, which is compatible with Excel and Google Sheets.

Used for: Accounting, budget tracking, data analysis.

PDF

PDF — Export for printing

Click the PDF button to download your calculation history in PDF format, ready to print or share.

Used for: Quotes, invoices, archiving, printable reports.

Delete

Delete — Clear All

Click the Delete button to clear the entire calculation history from the notepad at once.

Used for: Starting a new session with a clean notepad.

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Use the physical keyboard or the on-screen keyboard

There are two ways to enter your calculations. The on-screen keyboard, displayed on the screen, works with mouse clicks or taps on a touchscreen. The numeric keypad on your physical keyboard works the same way: each key corresponds directly to a number or an operator. The Enter key replaces the "=" key to confirm the calculation. Both methods produce the same result. Choose the one that works best for your device.

What is an online calculator used for in everyday life?

Much more than just a calculation tool, the online calculator meets a wide range of practical needs—from weekend grocery shopping to business invoicing. Here are the most common uses.

Managing Your Budget and Expenses

Keeping track of your personal finances has never been easier. This free calculator lets you add up your purchases, estimate rent, or plan your monthly expenses in just a few seconds.

Total for the trip: 5 items at €3.50 + €12.90 + €7.20 + €1.80 + €4.60 = exactly €30.00.

15% discount: Item priced at €89.90 — enter 89.90 × 15% = €13.49. Final price: 89.90 − 13.49 = 76.42 €.

To take your revenue projections a step further, an online revenue simulator for small businesses can be a useful complement to your calculator.

Support for Studies and Work

Whether you're a middle school student, a high school student, or a corporate executive, the online calculator lets you instantly check a result in math, physics, or chemistry—without leaving your browser.

Sales margin: Product sold for €250 (excluding tax), cost price €175. Calculation: (250 − 175) ÷ 250 × 100 = 30% margin. Essential for setting your rates as a freelancer.

Perform accounting or billing calculations

Sales tax, invoice totals, bank balances—these are all tasks where a calculator becomes an invaluable tool for both professionals and individuals.

20% VAT: €1,500 (excl. tax) × 1.20 = €1,800 (incl. tax). To find the amount excluding tax: €1,800 ÷ 1.20 = €1,500 (excl. tax).

When these calculations become repetitive, an online accounting service like Swapn can automate your daily VAT, invoicing, and bookkeeping, saving you valuable time.

Why choose an online calculator over a mobile app?

Downloading an app takes time, storage space, and sometimes even requires an account. A web calculator, on the other hand, opens right in your browser—no hassle, no wait, no compromises.

No downloads, no installation

Launch Chrome, Firefox, Safari, or Edge, go to the page, and start calculating right away. No files to download, no storage space used, and no updates to manage. The tool is ready in less than two seconds—just like those online business plan generators that you can use right away, without any hassle.

Compatible with PCs, tablets, and smartphones

The display automatically adjusts to the size of your screen thanks to its responsive design. Whether you use a mouse or your finger, both navigation methods work with the same precision. And once the page has loaded, the calculator remains fully functional even if your internet connection is unstable.

Free, with no ads or registration required

No need to create an account, no usage limits, and no ads to click through. Your calculation data is neither stored nor transmitted to any external server. Calculate freely, as often as you like, with complete privacy.

How do you calculate a percentage using an online calculator?

It couldn't be easier: enter your base amount, press ×, enter the desired percentage, and then confirm with the % key.

Example: To find 15% of 200, type 200 × 15%—the calculator displays 30 directly, without any intermediate steps.

Can you calculate sales tax using an online calculator?

Yes, exactly. To calculate the total amount (including tax) from a price excluding tax, simply multiply by 1.20 if the tax rate is 20%. To find the price excluding tax from the total amount, do the reverse: divide by 1.20.

Example: 1,500 € (excluding tax) × 1.20 = 1,800 € (including tax). Conversely: 1,800 € ÷ 1.20 = 1,500 € (excluding tax).

To better understand how VAT applies based on your legal status, see our guide on VAT for micro-businesses.

How can I perform a calculation online without downloading an app?

Simply open your browser, go to a free online calculator, and start calculating. Enter your numbers using the keyboard or the on-screen virtual keys, then confirm with "=" or the Enter key. No downloads, no installation, no registration—the tool is available right away.

Does the numeric keypad on the keyboard work for online calculations?

Yes, the numeric keypad is fully compatible. The keys 0 through 9, as well as +, −, ×, ÷, and Enter, work directly on the online calculator. If the keys aren't responding, check to make sure the Num Lock key is turned on on your keyboard.

All Types of Online Calculators

Here is a clear overview of the different types of online calculators available today, depending on your needs:

A simple online calculator is the most basic type, used for common operations such as addition, subtraction, multiplication, and division. It is ideal for quick, everyday calculations.

The Scientific Calculator is more advanced and can solve complex equations, as well as mathematical, trigonometric, and exponential functions. It is very useful for students and professionals.

"Scientific calculator" is a general term that often refers to simple calculators used for all basic mathematical calculations.

Finally, a modern online calculator can combine multiple features into a single interface, offering a comprehensive and convenient solution for all types of calculations.

Why Use Our Online Calculator?

Our online calculator is designed to provide fast, accurate, and easy-to-use calculations on both mobile devices and computers. Whether you want to perform a basic calculation or use an advanced scientific calculator, everything is available on a single page with a modern, seamless interface.

• Instant and Accurate Calculation
• Simple, user-friendly interface
• Built-in basic and scientific calculators
• Compatible with cell phones, tablets, and PCs
• Quick results without downloading
• Calculation history available
• Option to download results as a CSV or PDF file
• Free to use at any time

With our tool, you can easily solve your everyday, school, or work-related math problems in just a few seconds.

Calculation Tool Compatible with Mobile Devices and PCs

Our calculator stands out for its compatibility with all devices, whether mobile phones, laptops, desktop computers, or tablets. It is fully responsive, which means it adapts perfectly to all screen sizes to provide a smooth and comfortable experience. Unlike some platforms where the display is not optimized and results may be difficult to see or hidden, our interface guarantees perfect readability and a clear display.

In addition, the color scheme was carefully chosen to provide a design that is pleasing to the eye and easy on the eyes for users. Everything is designed to ensure maximum user comfort and prevent any difficulties during calculations.

Scientific Calculator vs. Basic Calculator

The basic calculator is ideal for everyday operations such as addition, subtraction, multiplication, and division. It is perfect for quick and easy calculations used at school, at the office, or in everyday life.

The scientific calculator, on the other hand, offers advanced features for students, engineers, and professionals. It allows users to perform complex calculations such as powers, roots, logarithms, trigonometric functions, and mathematical equations.

Simple Calculator

• Addition, subtraction, multiplication, and division
• Quick and easy to use
• Perfect for everyday calculations
• Minimalist and user-friendly interface

Scientific Calculator

• Advanced Mathematical Functions
• Calculating Sines, Cosines, and Tangents
• Power Operations and Square Roots
• Perfect for scientific and technical studies

With our platform, you can use both types of calculators for free on a single page, with no installation or registration required.

Other Free Calculation Tools

Depending on your needs, specialized calculators complement the standard calculator to provide more accurate and faster results.

Online Scientific Calculator

To go beyond the four basic operations, the online scientific calculator takes over. It handles trigonometric functions—sine, cosine, tangent—as well as logarithms, powers, and square roots. A tool designed for high school and college students as well as professionals who perform complex calculations on a daily basis.

Percentage Calculation

Find the percentage of an amount, calculate a discount, determine a percentage increase, or compare two values: a dedicated percentage calculator provides the result with just one click. This is especially useful for estimating your projected revenue before launching your business.

VAT Calculator

Converting from the pre-tax amount to the total amount including tax—and vice versa—based on current French VAT rates (20%, 10%, 5.5%, 2.1%) is instantaneous thanks to a dedicated VAT calculator. Beyond one-time calculations, regular VAT management involves filing periodic returns. Solutions like Swapn help entrepreneurs meet their tax obligations to avoid any errors.

Unit Conversion

Length, mass, temperature, currencies: An online unit converter instantly converts a value from one system to another. No more formulas to memorize or conversion errors—the result appears immediately, regardless of the original unit.

Conclusion

In conclusion, our online calculator brings together everything you need to perform your calculations—whether simple or complex—on a single page. With the basic calculator, you can quickly solve everyday problems: addition, subtraction, multiplication, division, and percentages. With the scientific calculator, you have access to advanced functions—trigonometry, logarithms, powers, and roots—that are useful for academic studies and technical fields.

These two tools have been carefully designed to save you time and provide accurate results in just a few seconds. Each feature is explained step by step, accompanied by screenshots, so that you can use the calculator with ease, regardless of your skill level.

The calculation notepad automatically records the history of each operation, which you can view, edit, and annotate at any time, then export as a CSV or PDF file as needed. The interface is fully compatible with mobile devices, tablets, and computers, ensuring a seamless user experience in any situation.

We invite you to try out these two calculators and share your feedback with us. Your comments help us continuously improve this tool so that it better meets your needs.

FAQ (Frequently Asked Questions)