Online Calculator
Use the Online Calculator for basic arithmetic, percentages, roots, powers, trigonometry, logarithms, factorials, memory functions and calculation history directly in your browser.
Quick Access to Other Tools
Use the Free Online Calculator
Select Basic or Scientific mode, enter a number and choose the required operation. Arithmetic calculations can also be entered using the supported keyboard keys.
About the Online Calculator
The FreeToolsPoint Online Calculator combines a basic arithmetic calculator and a scientific calculator in one browser-based interface.
Basic mode provides addition, subtraction, multiplication, division, percentage, square root, square, decimal and memory controls. Scientific mode adds cubes, factorials, trigonometric functions, logarithms, exponentials, pi, reciprocal and absolute value.
Calculations are displayed immediately and recent operations are shown in the history area. Up to ten calculations are kept during the current page session.
Basic Arithmetic
Add, subtract, multiply and divide positive or negative decimal values.
Scientific Mode
Access roots, powers, trigonometry, logarithms and other advanced functions.
Memory Controls
Store, recall, add to or subtract from the calculator memory value.
Calculation History
Review up to ten recently completed calculations.
Online Calculator Functions
The following table explains how the main calculator buttons process the currently displayed number.
| Button | Function | Important detail |
|---|---|---|
| +, −, ×, ÷ | Arithmetic operations | Division by zero displays an error. |
| % | Percentage conversion | Divides the current displayed value by 100. |
| √ | Square root | A negative input displays an imaginary-number error. |
| x² and x³ | Square and cube | Raises the current value to the second or third power. |
| sin, cos, tan | Trigonometric functions | The current value is interpreted as degrees. |
| log | Base-10 logarithm | Requires an input greater than zero. |
| ln | Natural logarithm | Requires an input greater than zero. |
| eˣ | Exponential function | Calculates the mathematical constant e raised to x. |
| π | Pi | Replaces the current value with JavaScript’s Math.PI. |
| 1/x | Reciprocal | Zero displays a division-by-zero error. |
| |x| | Absolute value | Returns the non-negative magnitude of the value. |
| x! | Factorial | Accepts non-negative integers up to 170. |
How to Use the Online Calculator
- Select Basic mode for common arithmetic or Scientific mode for advanced functions.
- Enter a number using the on-screen buttons or your keyboard.
- For arithmetic, choose an operation and enter the second number.
- Select equals or press Enter to display the result.
- For a scientific calculation, enter a value and select the required scientific function.
- Review completed calculations in the history area.
- Select Clear History in Scientific mode to remove all history entries.
Supported Keyboard Keys
- Number keys from 0 to 9.
- Decimal point.
- Plus and minus keys.
- Asterisk for multiplication.
- Forward slash for division.
- Percentage key.
- Enter or equals to calculate.
- Escape to clear the current calculator state.
Online Calculator Memory Functions
The memory indicator appears in the upper-left area of the display. It begins at zero and changes when the memory controls are used.
- MC: Clears the memory value and returns it to zero.
- MR: Places the stored memory value on the calculator display.
- M+: Adds the current displayed number to memory.
- M−: Subtracts the current displayed number from memory.
Online Calculator Examples
Basic Addition
Enter 125, select plus, enter 75 and select equals. The result is 200.
Percentage Conversion
Enter 25 and select the percentage button. The displayed result is 0.25 because the percentage function divides the current number by 100.
Square Root
Enter 144 and select the square-root button. The result is 12.
Trigonometric Calculation
Switch to Scientific mode, enter 30 and select sin. The calculator treats 30 as degrees and displays approximately 0.5.
Factorial
Enter 5 and select x!. The calculator calculates 5 × 4 × 3 × 2 × 1 and displays 120.
Online Calculator Limitations
The calculator uses JavaScript numerical functions. Results may therefore show normal floating-point behaviour for some decimal calculations.
- Number entry is limited to twelve characters.
- Trigonometric functions use degrees rather than radians.
- The percentage button divides the current number by 100.
- Factorials require non-negative whole numbers.
- Factorial inputs above 170 display a value-too-large error.
- Square roots of negative numbers are not calculated as complex numbers.
- Calculation history is limited to ten entries.
- The calculator does not provide symbolic algebra, differentiation, integration or graphing.
Online Calculator Privacy
Calculator operations, the memory value and calculation history are managed through JavaScript in the browser. The calculator code does not contain a command that uploads the entered calculations to FreeToolsPoint.
History and memory are not saved in localStorage. They are reset when the page is refreshed or closed.
The wider website may separately use hosting logs, analytics, cookies or advertising services. Those activities should be explained in the main FreeToolsPoint Privacy Policy and Cookie Policy.
Online Calculator Frequently Asked Questions
What calculations can the Online Calculator perform?
It supports arithmetic, percentages, roots, squares, cubes, trigonometric functions, logarithms, exponentials, reciprocals, absolute values and factorials.
Does the calculator use degrees or radians?
The sine, cosine and tangent functions interpret the current number as degrees.
How does the percentage button work?
It divides the currently displayed value by 100. For example, entering 25 and selecting percentage displays 0.25.
What do MC, MR, M+ and M− mean?
MC clears memory, MR recalls memory, M+ adds the current number to memory and M− subtracts it from memory.
How many calculations are stored in history?
The calculator keeps up to ten recent calculations during the current page session.
How do I clear the calculation history?
Switch to Scientific mode and select Clear History.
Can I use the calculator with my keyboard?
Yes. Supported keys include numbers, decimal point, addition, subtraction, multiplication, division, percentage, Enter, equals and Escape.
Can the calculator divide by zero?
No. Attempting division by zero displays an error message.
Can it calculate the square root of a negative number?
No. The current calculator does not calculate complex numbers and displays an imaginary-number error.
Are my calculations saved or uploaded?
The calculator runs through JavaScript in the browser. History and memory are not permanently saved and reset when the page is refreshed or closed.