About CalcArcade

CalcArcade is a collection of free online calculators built and maintained by DigiOrbitz. The goal is simple: give people a fast, clear calculator for everyday numbers, and show the formula, the assumptions and a worked example so you can check the result yourself.

What you will find here

198 calculators across 12 categories, from loan payoff and compound interest to concrete volume, GPA, percentages and unit conversions. Where a result depends on rates, rules or health estimates, the page says so, names its source and shows when it was last reviewed.

How we keep results correct

Every calculation lives in one shared code library and is covered by automated tests that compare results against known published values and hand-checked examples. See the methodology page for details, and contact us if you think a result is wrong.

What we are not

We are not a financial adviser, lender, tax preparer, medical provider or engineering firm. Calculators give estimates for general information. Please confirm important figures with the relevant professional or institution.