Calculators that show their working.

What makes it different

Every calculator shows the formula it uses and works through it with your own numbers, so you can follow the answer instead of trusting a black box. Calculations run in your browser and update as you type. You don't need an account to use any of them.

What you'll find

• Math & Algebra: Percentages, fractions, roots, equations and the scientific keypad. (25 calculators)
• Finance & Investment: Mortgages, loans, interest, savings and what money becomes over time. (25 calculators)
• Business & Tax: Margins, markups, tax, pay and the ratios a business runs on. (25 calculators)
• Health & Fitness: Body measures, energy, training and pregnancy dates. Estimates, not medical advice. (25 calculators)
• Construction & Geometry: Materials for a job, and the areas and volumes of every shape. (25 calculators)
• Physics & Engineering: Motion, energy, force, electricity and heat. (25 calculators)
• Statistics & Probability: Describe data, test it, and count the chances. (25 calculators)
• Everyday & Conversions: Dates, time, units, grades and the sums of an ordinary day. (25 calculators)

Or browse all 200 calculators on one page, or press ⌘K anywhere to search.

How the answers are checked

Each calculator has its own set of worked examples with known answers, 875 in total across the site, and they are run automatically before every release. A release goes out only when every one of them passes. Formulas follow their standard published definitions, and each calculator's notes explain its assumptions and limits.

Results are estimates for information. Health results are not medical advice and money results are not financial advice; for decisions that matter, check with a qualified professional.

Accounts and history

If you sign in, the answers you work out are saved to your history with their inputs and your notes, so you can find, edit or delete them later. Signing in is optional. The privacy policy explains exactly what is stored.

Get in touch

Found a wrong answer, want a calculator added, or have a question? Write to contact@calculatorverse.online, or see the contact page.