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.

Calculate custom target heart rate training zones using Max HR, Karvonen HRR, or Joe Friel Lactate Threshold methods.

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

Estimate ovulation window from cycle length

Find optimal bedtime and wake time by 90-minute sleep cycles

Estimate calories burned from step count using MET-based science. Includes walking pace, stride length, weight, and instant comparison charts.

Estimate your VO₂ max using resting heart rate, Cooper test, Rockport walk, 1.5‑mile run, or step test. Instant rating and normative comparison.

Calculate your personalized daily water intake based on scientific research, considering age, weight, activity, and environmental factors.

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