Free Online Calculators

Instant answers for health, finance & life — lightning fast, mobile-friendly

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Health Calculators

Body Mass Index

Daily calorie needs

Navy method

Pregnancy calculator

Daily hydration

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Investment growth

Monthly payment

US & China

Future planning

Monthly installment

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Cloudflare edge network — <50ms globally

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Designed for thumbs, works perfectly on any screen

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Formulas sourced from WHO, peer-reviewed research