Free Health Calculators
Estimate BMI, calories and related metrics for personal tracking. These tools are educational, not medical advice, and keep your numbers in the browser.
BMI calculator
Estimate body mass index and a healthy weight range from height and weight.
OpenCalorie
Daily calorie targets to maintain, lose, or gain weight from BMR and activity.
OpenIdeal Weight
Ideal body weight estimates using Devine, Robinson, Miller, and Hamwi formulas.
OpenBMR calculator
Basal metabolic rate with Mifflin-St Jeor and revised Harris-Benedict.
OpenBody Fat
US Navy tape method for body fat percent, fat mass, and lean mass.
OpenPace
Running pace, speed, and finish times for 5K through marathon.
OpenArmy Body Fat
US Army tape test body fat with age-based maximum standards.
OpenLean Body Mass
Lean body mass from Boer, James, and Hume formulas.
OpenCalories Burned
Estimate calories burned for common activities from MET and duration.
OpenAge
Exact age in years, months, and days between two dates.
OpenBody Type
Frame size from wrist and height, plus apple vs pear shape.
OpenBody Surface Area
BSA with Mosteller, DuBois, and Haycock formulas.
OpenProtein
Daily protein target from body weight and goal.
OpenCarbohydrate
Daily carb grams from calories and diet style.
OpenGFR calculator
CKD-EPI 2021 estimated kidney function (eGFR) and stage.
OpenFat Intake
Recommended daily fat grams from calorie intake.
OpenAge Gap
Age difference between two birth dates.
OpenWeight Watcher points
Classic points from calories, fat, and fiber.
OpenTarget heart rate zone
Training heart-rate zones from age and resting heart rate.
OpenWeight Gain
Calories and surplus needed to gain weight over a set timeline.
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Browse the full catalog on the home page.