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Health Calculators

Simple health calculators — start with a Body Mass Index (BMI) calculator that works in both metric and imperial units.

7 tools · 100% client-side · nothing is uploaded

⚖️BMI

Calculate your Body Mass Index (BMI) in metric or imperial units and see the standard weight category. Free online.

🔥BMR

Estimate your Basal Metabolic Rate (BMR) and daily calorie needs with the Mifflin-St Jeor equation. Free online.

📊Body Fat

Estimate body fat percentage using the U.S. Navy circumference method. Free online body fat calculator.

🏃Pace

Calculate running pace per km and per mile, plus speed, from distance and time. Free online pace calculator.

😴Sleep

Find the best bedtimes or wake-up times based on 90-minute sleep cycles. Adjustable cycle length and fall-asleep time. Free sleep cycle calculator.

💧Water Intake

Estimate your recommended daily water intake from body weight and activity. Metric and imperial. Free online water calculator.

🔥Calories Burned

Estimate calories burned during exercise from the activity's MET value, your weight and duration. Free online calorie burn calculator.
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Privacy: every tool in this category runs entirely in your browser. Your input is never sent to, received by, or stored on any server — no uploads, no tracking.