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Free Calculators for the United States

150+ calculators optimized for American standards — US tax brackets, mortgage rates, imperial units, and FDA health guidelines.

Most Popular US Calculators

Built for American Users

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Imperial Units

Feet, inches, pounds, Fahrenheit — default units match US standards.

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US Tax & Finance

Federal tax brackets, 401(k), IRA, Social Security calculations included.

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FDA & CDC Guidelines

Health calculators follow US clinical standards and recommendations.

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