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About CalcHub

CalcHub is a collection of free calculators, converters and tools for everyday life, projects and planning: money, grades, dates, units, health, travel, astronomy and more. Every tool runs as a single page: enter your numbers and the answer updates instantly.

What you can do here

Browse calculators by category, search by name or keyword, or start from the popular tools on the homepage. Each calculator explains how its result is calculated, shows a worked example, and links to related calculators.

Health, tax and financial results are estimates. They are labelled as such on the relevant pages, together with the assumptions behind them.

New tools

New calculators are added regularly. If the one you need is missing, check back soon.