Percentage Calculator
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Calculate what percentage one value represents of another total. The total must not be zero.
Square Root Calculator
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Find the principal square root of a non-negative number. Results are displayed to six decimal places.
KM to Miles Converter
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Convert a non-negative distance from kilometres into miles using the conversion factor applied by this calculator.
Fraction Calculator
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Add, subtract, multiply or divide two fractions or decimal values. Enter fractions in a format such as 1/2.
Percentage Change Calculator
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Calculate the percentage increase or decrease from an original value to a new value.
Area Calculator
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Calculate the area of a square, rectangle, circle or triangle using the required dimensions.
About the Math Calculators
This page contains six calculators for common mathematical and measurement tasks. Enter the required figures and select the relevant calculation button to display the result.
The calculation functions run through JavaScript in your browser. They do not require an account or software installation.
Calculated results may be rounded for display. Review important
measurements and figures before relying on them for professional,
academic, construction or financial decisions.
Common Uses
- Checking marks, ratios and percentage-based comparisons.
- Reviewing square-root calculations for mathematics exercises.
- Converting road, travel, walking or running distances.
- Adding, subtracting, multiplying or dividing fractions.
- Comparing an original value with a later value.
- Estimating the area of basic geometric shapes.
Formulas Used
Percentage:
value ÷ total × 100
Square root:
the principal square root of the entered non-negative number
Kilometres to miles:
kilometres × 0.621371
Percentage change:
(new value − original value) ÷ original value × 100
Square area:
side × side
Rectangle area:
length × width
Circle area:
π × radius²
Triangle area:
½ × base × height
Practical Calculation Tips
- Check that all values use the same measurement unit.
- Do not enter zero as the total in the percentage calculator.
- Use non-negative numbers for square roots and distance conversion.
- Enter fractions in a format such as 1/2 or use a decimal value.
- The original value in percentage change must not be zero.
- Area results are shown in square units based on the units entered for the dimensions.
- Recheck source figures when the result will be used for an important decision.
Try Other FreeToolsPoint Tools
Frequently Asked Questions
Do I need to create an account?
No. The calculators on this page do not require account registration or login.
Are the entered values uploaded?
The calculation functions in this page process the entered values through JavaScript in your browser. The calculator functions do not include a command that sends those figures to FreeToolsPoint.
Why does the area calculator show different fields?
The required dimensions depend on the selected shape. A square and circle need one value, while a rectangle and triangle require two values.
Why does the percentage calculator reject a zero total?
A percentage cannot be calculated by dividing a value by zero.
Why does the percentage-change calculator reject a zero original value?
The formula divides the difference by the original value. Division by zero is undefined.
How are fraction results displayed?
The current calculator converts the entered fractions into numbers and displays the result as a decimal to six places.
How are area units determined?
The calculator does not select a measurement unit. The result uses the square of whichever unit you entered, such as square metres or square feet.
Can I use the calculators on a mobile device?
Yes. The page layout is designed to adjust to mobile phones, tablets and desktop screens.
Can I suggest a correction or another calculator?
Yes. Send feedback to support@freetoolspoint.com .