SteadyCalculator is a free library of online calculators that show their working. Every calculator on this site gives you three things: the answer, the formula behind it, and a worked example with real numbers. If a number matters enough to calculate, it matters enough to check.
The site covers money and finance, math, health and fitness, home and construction, cost estimates, engineering, science, clinical reference tools, business, sports and travel, computing, education and everyday questions, with new calculators added over time.
How we work:
- Every calculator states its formula and, where the result depends on rates or a method, its source.
- Calculations run in your browser. What you type in is not sent to us or stored.
- If you spot an error, tell us through the Contact page and we will check it and fix it.
SteadyCalculator is a calculator library, not professional advice. For tax, legal, medical or financial decisions that matter, use our results as a starting point and confirm them with a qualified professional or the official source.