About Health Calculators

health.xaygo.com is a free, fast, and privacy-friendly collection of health calculators. Every calculation runs entirely in your browser — no data is sent to any server, no account is required.

Tools on this site

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BMI Calculator

Body Mass Index with WHO weight categories and a visual gauge. Imperial & metric.

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Calorie Calculator

Daily TDEE using the Mifflin-St Jeor formula with calorie targets by goal.

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Body Fat Calculator

U.S. Navy circumference method — no calipers, just a tape measure.

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Due Date Calculator

Pregnancy EDD via LMP, conception date, or IVF transfer date, with milestone timeline.

Our principles

Free forever — no paywalls, no sign-ups.
Privacy-first — all calculations run locally in your browser. No health data is transmitted or stored.
Informational only — results are estimates based on established formulas. Always consult a qualified healthcare provider for medical decisions.
Standards-based — BMI uses WHO thresholds; calories use Mifflin-St Jeor; body fat uses the U.S. Navy method; due date uses Naegele's rule.

Part of the Xaygo family

health.xaygo.com is one of several free tools by Xaygo Labs. Visit xaygo.com for developer utilities or calc.xaygo.com for financial calculators.

Contact

Questions or feedback? Email us at [email protected].