AllCalcs (allcalcs.tools) is a free collection of online calculators and small browser tools for everyday questions: money, home projects, health and fitness, school, farming, pets and more. There are no accounts, no paywalls and no sign-up forms.
Who runs AllCalcs
The site is owned and edited by Umar Hayat. He decides what gets built, signs off on the formulas and sources a page relies on, and is the person to contact when something is wrong.
Why the site exists
Many calculator sites bury a simple answer under pop-ups, or give a number without saying how it was worked out. AllCalcs tries to do the opposite: every calculator shows the formula it uses, a table of worked examples you can check by hand, and the assumptions behind the result.
How the calculators are made
We use software tools, including AI writing and coding assistants, to help draft explanations and build calculators faster. Software speeds up the work but does not decide what is correct. Formulas are taken from named, published sources, and newer calculators are tested in a real browser against their own worked examples before they go live. The full process is on our How we build and check our calculators page.
What AllCalcs is not
The calculators give estimates for planning and learning. They are not medical, legal, tax or financial advice, and they do not replace a doctor, vet, accountant, engineer or other professional. Please read our disclaimer before relying on a result for an important decision.
Found a mistake?
If a result looks wrong, a source is out of date or a fee or limit has changed, please tell us through the contact page. Include the page address and the numbers you entered. Corrections are checked and, when confirmed, fixed on the page.