About
CalcHub is a free collection of calculators for everyday decisions — money, measurements, health, study, and time. Every tool aims to be quick to use, accurate, and clear about how it reached its answer.
How the calculators are built
Each calculator is written as a small, self-contained formula that is covered by automated tests. Values are kept at full precision through the calculation and rounded only when they are displayed, so results do not drift.
Every page shows the formula it uses and a worked example, so you can check the method rather than taking a number on trust.
Languages and units
The platform is fully available in English, Spanish, French, Portuguese, and Arabic, including a right-to-left layout for Arabic. Numbers and dates follow the conventions of the language you are reading.
Where a calculation depends on units, both metric and imperial inputs are supported and converted through one shared conversion layer.
What these tools are not
The calculators give estimates for general information. They are not financial, medical, legal, or professional advice, and they cannot account for your full circumstances. For decisions that matter, please confirm the result with a qualified professional.