Health tools

9 free health tools, all running in your browser.

Estimate your body fat percentage using the US Navy method with just a tape measure. No calipers or special equipment needed.

Calculate pregnancy due date from last period, conception date, or dating scan.

Estimate target heart-rate zones using maximum heart rate, Karvonen HRR, or lactate-threshold methods.

Calculate daily protein, carbohydrate, and fat targets based on your goals

Estimate ovulation window from cycle length

Estimate possible bedtimes and wake times using 90-minute intervals

Estimate calories from step count, body weight, stride, and activity pace.

Estimate VO₂ max with a resting-heart-rate calculation or one of four field tests.

Estimate daily fluid amounts from age, weight, activity, and environmental factors.

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