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Fast, accurate everyday math — 17 smart calculators.
Processing happens in your browser — there is no upload step to trust.
Open a tool and use it. No account, no credits, no watermarked exports.
Every tool page documents its inputs, outputs, limits and failure modes.
Sixteen calculators for the math you actually do: percentages three ways, exact age in years, months and days, BMI with an honest category read-out, loan EMIs with principal-versus-interest breakdowns, unit conversion across eight categories, date differences with business days, discounts with tax, and tipping with per-person rounding.
Each calculator computes live as you type and shows its working — the formula or method is on the page, and edge cases (a zero denominator, a reversed date range, February 29 birthdays) are handled and labelled rather than hidden. Where a result is an estimate, the tool says so.
Nothing you type is submitted anywhere. The calculators are plain TypeScript running in your browser, so they keep working on a plane, in a basement, or anywhere else the signal drops.
The full directory lists every tool on the site with search, category filters and sorting.
Browse all tools