Calculators for the numbers in your life
Mortgage payments, compound interest, calories, grades, due dates — BeadCalc does the math instantly, shows the formula behind every answer, and checks its own work with worked examples. Free, no sign-up, nothing leaves your browser.
Mortgages, loans, interest, taxes, salaries and retirement — the money math of everyday life, done exactly.
BMI, calories, body fat, pregnancy dates and running pace — health numbers estimated with the standard formulas doctors and coaches use.
Percentages, fractions, dates, grades and a full scientific calculator — school, work and everyday arithmetic without the friction.
Anyone can put a form on a web page. The hard part is being right — every time, on the inputs real people actually type. Every BeadCalc tool therefore shows its formula in plain sight, works a full numerical example underneath the calculator, and is validated against independently computed reference values before it is published. If a tool ever disagrees with the example printed on its own page, the page is wrong and we want to hear about it.
BeadCalc is named after the beads of the abacus — for thousands of years the world's calculator. The abacus had no batteries, no ads in the way and no wrong answers. That is the standard we build to.