Health

Most used

• Target Heart Rate CalculatorWork out the upper limit of your training zone from age and resting heart rate using the Karvonen method.
• Treadmill Calorie CalculatorEstimate the calories burned on a treadmill from speed, incline, weight and time using the ACSM equations.
• Waist to Hip Ratio CalculatorDivide your waist by your hip measurement and see where the result sits against the WHO cut-offs for men and women.
• Calorie Deficit CalculatorSee how many weeks a given calorie deficit needs to reach your goal weight, with your metabolism recalculated as you go.
• Pregnancy Week CalculatorCount how many weeks pregnant you are from the first day of your last period, corrected for your own cycle length.
• Calories Burned CalculatorCalories burned walking, hiking, swimming, cycling or running — by time or by distance, scaled to your body weight.
• Body Fat Percentage CalculatorEstimate body fat from neck, waist and height using the US Navy circumference method — no calipers or scales needed.
• Macro CalculatorProtein per kilogram, fat as a share of calories, carbohydrate as the remainder. This page answers the hard part: how many grams of carbs are left.

All, A–Z

• A1C CalculatorTurn an average blood glucose in mg/dL or mmol/L into an estimated A1C with the ADA's eAG equation, and see which reference range it falls in.
• Adult BMI CalculatorEnter height and weight to get your body mass index, the WHO category it falls in, and where you sit on the scale.
• Blood Alcohol CalculatorEstimate blood alcohol in per mille with the Widmark formula, from German standard servings, body mass and the hours since the first drink.
• BMR CalculatorYour basal metabolic rate from Mifflin-St Jeor, the revised Harris-Benedict equation or Katch-McArdle — three published equations, one page.
• Body Shape CalculatorEnter bust, waist, high hip and hip and read off the FFIT body shape from NC State's apparel research: hourglass, spoon, triangle and four more.
• Cycling Calorie CalculatorCalories burned on a bike from weight, speed and time. Speed selects the intensity band, because air resistance grows faster than pace.
• FFMI CalculatorWork out fat-free mass index from height, weight and body fat, with Kouri's height adjustment, and compare it against published athlete figures.
• Free Water Deficit CalculatorThe free water deficit in hypernatremia, from body weight, patient group and the gap between current and target sodium.
• HOMA-IR CalculatorHOMA-IR from fasting glucose and insulin, with the right divisor for mg/dL or mmol/L. An orientation value, not a diagnosis.
• Ideal Weight CalculatorCompare the Devine, Robinson, Miller and Hamwi estimates of ideal body weight for your height and sex.
• One Rep Max CalculatorEstimate your one-rep max from a set you already lifted, using Epley, Brzycki, Lombardi, O'Conner or Lander.
• Prostate Volume CalculatorProstate volume from three ultrasound or MRI diameters, using the ellipsoid formula. A size estimate, not a diagnosis.
• Rucking Calorie CalculatorCalories burned rucking, from the Pandolf load-carriage equation: body weight, pack weight, pace, grade and terrain.
• Running Pace CalculatorYour pace in minutes per kilometre from a distance and a finish time — with the standard race distances and their target paces below.
• TDEE CalculatorEstimate your total daily energy expenditure from the Mifflin-St Jeor equation and an activity factor you pick yourself.