About ToolCalcu

ToolCalcu is a collection of free online calculators and converters. Each one puts the result first and the method right beside it, so you can see how the answer was reached and decide whether it fits your situation.

Every calculator documents its formula, a worked example you can check by hand, and the assumptions and limits behind it. Results are general information and are not professional advice.

The calculators cover everyday questions about pay and work, percentages and statistics, geometry, cooking conversions, fitness and travel, shopping and technology. They run in your browser: the numbers you enter are used to compute the result on your device.

How the site works

The mathematics of each calculator is kept separate from the web page and tested with known cases, extreme values and invalid input. The methodology page explains this in detail, along with how rounding, sources and corrections are handled.

What the results mean

The tools give estimates from the numbers you provide. They do not replace the advice of a professional or the rules that apply to your country, employer or school.

• Read the methodology and corrections policy
• Contact