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Select the tool you need, such as percentage, area, rule of three, or trigonometric functions.
Free Math Tools
Fast Mathematics Tools
Calculate percentages, areas, rule of three, angles, and trigonometric functions from one simple page.
100% FreeNo sign-upInstant resultsMultiple tools
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Ready-to-use tools
Choose your calculation
Calculator
Percentage
Area
Rule of Three
Trigonometry
Angles
Start here: choose a tool, enter your values, and see the result instantly.
Calculator
Type a simple expression and get the result instantly.
Result
20
Area Calculator
Calculate rectangle, triangle, or circle area.
Area
50
Percentage Calculator
Calculate a percentage of a number.
Result
30
Rule of Three Direct
If A corresponds to B, what corresponds to C?
Result
25
Rule of Three Inverse
Calculate inverse proportion between values.
Result
8
Trigonometric Functions
Calculate sin, cos, and tan for angles.
Result
0.5
Radians and Degrees Converter
Convert between degrees and radians easily.
Radians
3.14159265
Popular use cases
Calculate percentages quickly
Calculate rectangle, triangle, and circle areas
Use direct and inverse rule of three
Convert degrees to radians and back
Calculate sin, cos, and tan
Run simple everyday calculations
Built for everyday calculations
Free
Use the tools without creating an account.
Instant
Results update instantly as you enter values.
Practical
Useful for students, work, and everyday math.
How to use
How to use the Mathematics Tools
Choose the math tool you need, enter the required values, and the result will appear instantly on the same page.
02
Enter values
Type the required numbers into the fields for each tool.
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Review the result
The result will appear instantly without refreshing the page.
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Try another tool
Move between the math tools on the same page depending on your needs.
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