About us

Calculators should make decisions clearer

CalculatorCheck is building a focused library of free online calculators for everyday questions—from dates and percentages to personal finance and health measurements.

Our approach

We favor clear labels, visible assumptions, useful explanations, and results that work on any screen. Published calculators are tested against calendar or formula edge cases relevant to their purpose.

Privacy by design

Our calculator interactions run in your browser. You do not need an account, and the values entered into the Age Calculator are not sent to or stored by CalculatorCheck.

A growing library

This first release establishes the directory, categories, search, and reusable calculator format. More tools will be added carefully over time.