Looking for accurate and free health calculators ? Our collection of tools helps you measure key fitness metrics like BMI, BMR, TDEE, and body fat percentage in just a few clicks. Whether you want to lose weight, gain muscle, or maintain a healthy lifestyle, these calculators give you instant, reliable results — no ads, no sign-up, completely free.
Health Calculators
Free, private, no data stored.
BMI
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Category
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Healthy Range
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How it works
BMI = weight (kg) / (height (m))². <18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, ≥30 obese.
BMR Calculator (Mifflin–St Jeor)
Metric units. No data stored.
BMR (kcal/day)
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Daily Calorie Needs (TDEE)
Mifflin–St Jeor BMR × activity multiplier.
BMR (kcal)
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TDEE (kcal/day)
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Suggested Macros (P/F/C)
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How it works
We compute BMR with Mifflin–St Jeor, then multiply by activity. Macro split shown is 30/25/45 by calories.
Body Fat % (US Navy)
Metric units (cm). For women, hip is required.
Body Fat %
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Category
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How it works
US Navy method (metric): male uses log10(waist − neck), female uses log10(waist + hip − neck), both with log10(height).