Health & Fitness Calculators
13 toolsBMI, calories, metabolism and body metrics.
Body & Fitness
BMIBody mass index from height and weight, with healthy-range guidance.BMRBasal Metabolic Rate — the calories you burn at rest — from age, gender, height and weight, with TDEE by activity level and the Mifflin-St Jeor, Harris-Benedict and Katch-McArdle formulas.Body FatEstimate your body fat percentage with the U.S. Navy circumference method — from height, neck and waist (plus hip for women), with your ACE category and fat and lean mass, in metric or imperial.Water IntakeFind how much water to drink a day from your body weight and activity — your daily target in litres, millilitres and glasses, using 33 ml/kg plus 355 ml per 30 minutes of exercise. General guidance for healthy adults.CalorieDaily calorie needs for weight loss, maintenance or muscle gain — with BMR, TDEE, macros, water intake and a personalised plan.Weight Loss %Calculate the percentage of body weight lost from your starting weight, plus how much more to lose to reach your goal.Breastfeeding CaloriesEstimate daily calories while breastfeeding — Mifflin-St Jeor BMR × activity plus a lactation add-on (500 kcal exclusive, 330 partial), per CDC and FAO.Heat IndexFind the heat index (feels-like temperature) from air temperature and humidity using the official NWS/NOAA formula, with the Caution to Extreme Danger risk level.TDEEEstimate your Total Daily Energy Expenditure from age, height, weight, sex and activity using Mifflin-St Jeor, with cut, maintain and bulk calorie targets.MacrosCalculate your daily protein, carb and fat grams from BMR, TDEE and a chosen calorie goal using the Mifflin-St Jeor equation and Atwater factors.Protein IntakeFind your recommended daily protein in grams from body weight and activity level, from the RDA baseline to athlete ranges, plus an optional AMDR calorie-share check.BAC CalculatorEstimate your Blood Alcohol Content (BAC) from standard drinks, body weight, sex and time elapsed using the Widmark formula.