About

Everything Calculator is a free collection of online calculators covering finance, health, geometry, maths, science, and everyday tasks. Our goal is simple: give you a fast, accurate answer — and show the working so you actually understand it.

What makes us different

Most calculators just spit out a number. Every calculator here also explains the formula, walks through the steps, and gives a worked example, so it doubles as a quick way to learn the maths behind the result.

How the calculators work

All calculators run entirely in your browser using standard, well-established formulas (for example, the Mifflin-St Jeor equation for BMR, WHO categories for BMI, and standard amortisation for loans). Nothing you type is sent to a server.

Important note

Results are educational estimates and are not professional advice — please read our Disclaimer.

Get in touch

Suggestions for a new calculator, or found a mistake? We'd love to hear from you — see our Contact page.