Health & Fitness Calculators

BMI, calories, body fat, pace and more. · 17 tools

BMI CalculatorWork out your body mass index in metric or imperial units, see your WHO category and the healthy weight range for your height.Body Fat CalculatorEstimate body fat percentage from tape-measure readings with the US Navy method, plus fat mass, lean mass and ACE category.Calorie CalculatorFind your maintenance calories (TDEE) and a daily target to lose or gain weight at a safe weekly rate.Macro CalculatorTurn your calorie target into daily grams of protein, carbs and fat with balanced, low-carb, keto or custom splits.Pregnancy Due Date CalculatorEstimate your due date from your last period, conception, IVF transfer or a dating scan, with gestational age and milestones.BMR CalculatorEstimate your basal metabolic rate with Mifflin-St Jeor, Harris-Benedict or Katch-McArdle and see daily calories at every activity level.Calories Burned CalculatorEstimate calories burned in walking, running, cycling, swimming, gym work and sports using MET values and your weight.Heart Rate Zone CalculatorCalculate five heart rate training zones with the Karvonen method or percentage of max, using Tanaka, Fox, Gulati or a measured maximum.Ideal Weight CalculatorCompare ideal body weight from the Devine, Robinson, Miller and Hamwi formulas with the healthy BMI range for your height.Lean Body Mass CalculatorEstimate lean body mass with the Boer, James and Hume formulas, or exactly from your body fat percentage.One Rep Max CalculatorEstimate your one-rep max from any set with Epley, Brzycki and five other formulas, plus a percentage table for training loads.Ovulation CalculatorPredict ovulation, your fertile window and next periods for up to 12 cycles from your last period and cycle length.Protein Intake CalculatorFind your daily protein target in grams from body weight and goal, from the 0.8 g/kg RDA to muscle-building ranges.Running Pace CalculatorCalculate running pace, finish time or distance, see per-km or per-mile splits and predict race times with Riegel's formula.Sleep Cycle CalculatorFind the best bedtime for your alarm, or the best wake-up time for your bedtime, based on 90-minute sleep cycles.Waist to Hip Ratio CalculatorCalculate your waist-to-hip and waist-to-height ratios and compare them with WHO risk cut-offs for men and women.Water Intake CalculatorEstimate how much water to drink each day from your weight, exercise, climate and pregnancy or breastfeeding status.

Track fitness goals with calculators for BMI, BMR, daily calories, macros, body fat, heart-rate zones and running pace. Each tool explains the formula it uses, such as Mifflin-St Jeor or the US Navy method, so you know where the number comes from.

These calculators provide general information only and are not medical advice. Talk to a qualified health professional before making significant changes to your diet or exercise.

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