About CalcTidy

CalcTidy is a collection of free calculators and time tools for everyday decisions: what a mortgage will really cost, how many calories you need, what time a meeting falls in another city, or how many days are left until a deadline.

How the tools are built

Every calculator uses the standard published formula for its topic, the same ones used by lenders, health agencies and textbooks, and each page shows that formula so you can check the result yourself. The worked examples on each page are recalculated whenever the formulas change.

All calculations run in your browser. The numbers you type are not sent to a server, stored or shared.

Accuracy

Results are estimates for information and planning. Financial results do not replace a lender’s official disclosure, and health results do not replace advice from a medical professional.

Found a mistake?

If a result looks wrong or a tool is missing something you need, email hello@calctidy.com. Corrections are made quickly.