Health

Calculate your BMI (body mass index) and see how it compares to WHO recommendations.

Find your BMR and TDEE (maintenance calories), then see exactly how many calories to eat to lose, maintain, or gain weight.

Estimate your baby's due date from your last period, conception or ultrasound — plus current week and trimester.

Estimate your fertile window, ovulation day and predicted next period from your last period date and cycle length.

Calculate your body fat percentage with three methods — US Navy, RFM and BMI — from a single set of measurements.

Calculate your running pace (min/km), speed, splits and predicted race times for 5K, 10K, half marathon and marathon.

Estimate how much water to drink each day from your body weight, activity, climate and life stage — with a drinking schedule and how you compare to others.

Estimate your ideal body weight using four named formulas (Devine, Robinson, Miller, Hamwi) plus the healthy BMI range — a more specific companion to a plain BMI calculator.

When to sleep or wake up, aligned to 90-minute sleep cycles.