Health
Health and wellness calculators using reference formulas: BMI, calories and more. Informational — not medical advice.
Tools in this category
Daily water intake calculator Find out how much water to drink daily from your weight, activity level and climate. Get the amount in liters and 250 ml glasses. Free, instant. Macro calculator Macro calculator: split your daily calories into grams of protein, carbs and fat by goal (balanced, keto, low-carb, high-protein). Free and private. Sleep calculator (cycles) Find the best time to go to bed or wake up based on 90-minute sleep cycles, so you wake up between cycles feeling rested, not groggy. Free tool. Pregnancy calculator Estimate your due date with the Naegele rule, plus current weeks and days of pregnancy, your trimester and how many days are left. Free and private. BMI calculator Work out your BMI from weight and height (kg/cm or lb/ft), see your WHO category and the healthy weight range for your height. Free, no sign-up. TDEE calculator Estimate your TDEE and basal metabolic rate with the Mifflin-St Jeor formula, plus daily calories to maintain, lose or gain weight. Free tool. Calories burned calculator Calculate calories burned by activity with the MET formula: your weight, exercise and minutes. Running, walking, cycling, swimming and more. Free. Blood glucose converter (mg/dL and mmol/L) Convert blood glucose between mg/dL and mmol/L both ways, with a fasting reference table for normal, prediabetes and diabetes ranges. Free and instant. Ovulation and fertile days calculator Estimate your fertile days, ovulation date and next period with the calendar method, using your last period and cycle length. Free, private and instant. Body fat calculator Estimate your body fat percentage with the US Navy method: sex, height, neck and waist (plus hip). Get your category by sex instantly. Free. Ideal weight calculator Find your ideal weight range from your sex and height: the healthy BMI range plus the Devine, Robinson and Miller reference formulas. No sign-up. Daily protein intake calculator Work out how many grams of protein you need per day from your body weight and goal: sedentary, active, fat loss or muscle gain. Free, instant, private. Heart rate zones calculator Find your maximum heart rate with 220 − age and the Tanaka formula, plus your 5 training zones in beats per minute, using the Karvonen method with resting HR. Running pace calculator Work out your running pace in min/km and min/mile, plus time and speed, from any two of distance, time and pace. Includes 5K, 10K, half and marathon splits. Body surface area (BSA) calculator Work out your body surface area (BSA) in m² with the Mosteller formula from height and weight, and compare it against Du Bois. Free, in your browser. One-rep max (1RM) calculator Estimate your one-rep max (1RM) with the Epley and Brzycki formulas from the weight lifted and reps. Includes a training load percentage table.