Health & Fitness
BMI, calories, body fat, water intake and due date.
These free health calculators give quick, private estimates for everyday fitness questions. Check your BMI with Asian-Indian cut-offs, your BMR and daily calories to lose or gain weight, body fat percentage and ideal weight. Find how much water and protein you need, your heart rate training zones and the best time to sleep or wake up. For expecting parents there are pregnancy due date and ovulation calculators. Your details stay on your device; always follow medical advice.
- BMI Calculator — Body Mass Index in metric or imperial units, with WHO and Asian-Indian cut-offs and your healthy weight range.
- BMR & Calorie Calculator — Find your BMR (Mifflin–St Jeor), daily calorie needs (TDEE) and targets to lose, maintain or gain weight, with a macro split.
- Body Fat Calculator — Estimate body fat percentage with the US Navy tape-measure method, plus fat mass, lean mass and category.
- Ideal Weight Calculator — Ideal body weight by the Devine, Robinson, Miller and Hamwi formulas, alongside the healthy BMI weight range.
- Water Intake Calculator — Estimate how much water to drink each day from your body weight, exercise and climate, in litres and glasses.
- Pregnancy Due Date Calculator — Estimate your due date from the last period (Naegele’s rule, adjusted for cycle length) or conception date, with current week, trimester and scan timeline.
- Ovulation Calculator — Find your fertile window and ovulation day for the next three cycles, shown on a colour-coded calendar.
- Heart Rate Zone Calculator — Work out your maximum heart rate (220 − age or Tanaka) and five Karvonen training zones using your resting heart rate.
- Sleep Calculator — Find the best bedtime or wake-up time based on 90-minute sleep cycles, allowing 15 minutes to fall asleep.
- Protein Intake Calculator — Daily protein needs in grams from your body weight, goal and activity level, with per-meal targets and Indian food sources.