Free Calculator
300 free online calculators across 15 categories
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Free Calculator - Free online calculators for everyday math and money

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We built 240+ free calculators so you never need a spreadsheet for life's math. Mortgage payments, compound interest, BMI, age, discounts, tips, taxes, and unit conversions, plus developer tools and 148 professional calculators for engineering, finance, and quality work. Everything runs in your browser with results as you type. No account, no signup, and it works on every device. We also offer a calculator API and MCP server so AI assistants can calculate too.

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Hey Product Hunt! We are launching Free Calculator, a collection of 240+ free calculators for everyday math and money. Mortgage payments, compound interest, BMI, tips, taxes, unit conversions, and 148 professional calculators for engineering and finance. No account or signup, results appear as you type, and everything works on any device. We also built a calculator API and MCP server for developers and AI assistants. Tell us which calculator we should add next.