Proportion Calculator
Solve the unknown number in the proportion by cross-multiplying: a : b = c : x.
Calculate the unknown side of a right triangle a² + b² = c² – hypotenuse or leg.
Calculate the unknown side of a right triangle a² + b² = c² – hypotenuse or leg.
This is an easy calculator designed to help students, teachers, and anyone who needs quick and accurate mathematical calculations. The calculator works entirely in your browser – none of the information you enter is sent to the server, so you can use it with confidence.
The calculator is aimed specifically at students, teachers, and anyone who needs quick and accurate mathematical calculations. The interface is designed to be as clear as possible: enter the required information into the fields and the result will be displayed immediately. The calculator is completely free and does not require registration.
Using it is simple. Enter the information requested by the calculator – such as income, expenses, dates, or other necessary input values – and the calculator will automatically calculate the result. You can freely change the values and see the result update in real-time. All calculations are done with JavaScript code directly in your browser, so the calculator also works without an internet connection after it has been loaded.
The calculator is optimized for both desktop and mobile devices. You can use it on your phone, tablet, or computer. Dark and light modes are supported, minimizing eye strain during use.
The calculator uses established mathematical formulas and produces accurate results based on the input values. Check the results manually for rounding errors in important calculations.
The calculators are updated at least once a year – or immediately when there are changes to relevant guidelines or reference values. The calculators are built to comply with standard practices.
You will get the best results by entering the values as accurately as possible. Try different scenarios – for example, how a small change in the input values affects the final result. This way, you can make better decisions by comparing multiple options side by side. If you are unsure about a value, use a conservative estimate or seek information from an official source.
Yes, all math calculators are completely free.
The calculator uses IEEE 754 floating-point arithmetic, and the results are accurate within the limits of computational rounding. Rounding errors may occur with very large or very small numbers.
Yes, the calculators are suitable for elementary school, high school, and college math assignments. However, always check your institution's rules regarding the use of aids during exams.
No. The calculations are done entirely in your browser and no data is saved.