This page is available in English.

About CalcKiwi

CalcKiwi is a free collection of more than 170 online calculators for everyday and professional tasks: loans and mortgages, taxes and salaries, dates and time zones, health and fitness, math and statistics, and engineering tools such as the Modbus register and subnet calculators.

How it works

Every calculation runs directly in your browser. The numbers you enter are not sent to our servers, so results appear instantly and your data stays on your device. Each calculator explains the formula it uses and answers common questions below the tool.

Accuracy

We test the formulas against known reference values, but results are estimates for information purposes. For important financial, medical, legal or engineering decisions, check the numbers with a qualified professional. See our Terms of Use for details.

Languages

The interface is available in English, Ukrainian, Russian, German, French, Spanish, Italian, Portuguese, Chinese and Arabic. Choose a language at the bottom of any page.

Free to use

CalcKiwi is free and does not require an account. The site is supported by advertising; see the Privacy Policy for how ads and cookies work.

Feedback

Found an error or missing a calculator? Contact us — corrections and suggestions are welcome.