Free, accurate calculators for money, health, and everyday math

CalculatNow is a free collection of calculators for money, real estate, health, math and everyday life. Every tool is built from a named, documented formula, takes its figures from the primary authority such as the IRS, the Social Security Administration, the CDC and the WHO, and is tested against that authority's own worked examples. Where a figure changes from year to year — a tax band, a contribution limit, a mileage rate — the page states the year it applies to, and the calculator and the wording around it are updated together so the two can never drift apart. Nothing is estimated silently: if a tool has to assume something, it says so, and it shows the working rather than only the answer. The site is free, and advertising is what pays for it. There are no accounts and nothing to sign up for, and every calculation runs in your browser, so the numbers you type never leave your device.

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