Free Online Health Calculators — TDEE, BMI, Macros & Women's Health

YourBodyMetrics provides science-backed calculators for fitness, nutrition and women's health. Calculate your TDEE, BMI, BMR, body fat, macros, due date, ovulation and more. No signup required — all calculations run in your browser.

Fitness and Nutrition

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TDEE Calculator
Total daily calories burned
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BMI Calculator
Body mass index and healthy range
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BMR Calculator
Calories burned at rest
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Body Fat Calculator
US Navy method estimate
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Macro Calculator
Protein, carbs and fat targets
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Ideal Weight
4 formula average target
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Calorie Deficit
Daily target and goal timeline

Women's Health and Pregnancy

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Due Date Calculator
Due date and pregnancy milestones
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Ovulation Calculator
Fertile window and ovulation date
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Pregnancy Weight Gain
Healthy gain by trimester
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Baby Growth Calculator
WHO weight and height percentile
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Period Calculator
12 month period schedule

Science-Backed Health Calculators

Every calculator on YourBodyMetrics uses validated formulas trusted by dietitians, personal trainers, and medical professionals. The fitness calculators use the Mifflin-St Jeor equation for BMR and TDEE, the US Navy circumference method for body fat, and four established clinical formulas for ideal weight. The women's health calculators follow WHO Child Growth Standards, Institute of Medicine pregnancy guidelines, and standard clinical methods for cycle and fertility tracking.

All tools work in both imperial and metric units, are fully mobile optimised, and give instant results with no signup required. Your data never leaves your device.

Where to Start

For fitness and weight goals, start with the TDEE Calculator to find your daily calorie burn, then use the Macro Calculator to set your protein, carb and fat targets. For weight loss, the Calorie Deficit Calculator tells you exactly when you will reach your goal weight. For women's health, the Ovulation Calculator and Period Calculator give you a complete picture of your cycle, while the Due Date Calculator covers everything you need through pregnancy.