BeadCalc is a free collection of online calculators for the numbers in everyday life: what a mortgage really costs, how savings grow, how many calories a day actually maintains your weight, what you need on the final exam, when the baby is due. No accounts, no paywalls, no "premium" tier — the answer appears the moment you type.
Why "BeadCalc"?
The site is named after the beads of the abacus. For thousands of years — in China as the suanpan, in Japan as the soroban, in Rome as the hand abacus — beads on rods were how humanity calculated. The abacus never ran out of battery, never showed a pop-up, and never gave a wrong answer unless its operator did. It is a good standard for a calculator website, and a reminder that the tools change but the arithmetic does not.
How we make sure the math is right
Every calculator on this site follows the same discipline. The formula is printed on the page, in the open. A complete worked example with real numbers sits beneath the calculator, computed independently — if the tool and the example ever disagree, we treat it as a bug. Before publication, each calculator's engine is tested against independently calculated reference values, including edge cases like leap years, zero interest rates and payments that barely cover interest. Where a method is an estimate (body fat percentage, calorie needs), the page says so and gives its typical accuracy.
What BeadCalc is not
BeadCalc results are estimates for education and planning. They are not financial advice, medical advice, tax preparation or a substitute for the figures on an official document. Lenders calculate with additional fees and day-count conventions; doctors use measurements we cannot take; tax law has credits and deductions beyond any single calculator's scope. Use our numbers to understand, compare and prepare — then confirm the final figure with the professional or institution responsible.
How the site is funded
BeadCalc is free to use and is supported by advertising. Ads never affect results, rankings on the page, or the order of tools — the math is the math. Our Privacy Policy explains exactly what data is and is not collected.
Questions, corrections and suggestions are genuinely welcome at our contact page. A calculator site lives or dies on being right, so if you spot a number that looks off, telling us is the most useful thing you can do.