BMI Calculator
Calculate your Body Mass Index in metric or imperial units and see which WHO weight category it falls into.
Open Calculator →Army Body Fat Calculator
Estimate body fat percentage using the official US Army circumference-based formula (AR 600-9).
Open Calculator →Blood Alcohol Content (BAC) Calculator
Estimate blood alcohol content using the Widmark formula. For education only — never a substitute for not driving after drinking.
Open Calculator →BMR Calculator
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation.
Open Calculator →Body Fat Calculator
Estimate body fat percentage from tape-measure circumferences using the US Navy method.
Open Calculator →Body Surface Area Calculator
Calculate body surface area (BSA) using the Mosteller formula.
Open Calculator →Calories Burned Calculator
Estimate calories burned during an activity using its MET value, your weight, and duration.
Open Calculator →Fat Intake Calculator
Calculate a recommended daily fat gram range from your daily calorie target.
Open Calculator →Height Calculator
Predict a child's approximate adult height from both parents' heights using the mid-parental height method.
Open Calculator →Lean Body Mass Calculator
Calculate lean body mass and fat mass using the Boer formula.
Open Calculator →Macro Calculator
Split a daily calorie target into protein, carb, and fat grams by percentage.
Open Calculator →Target Heart Rate Calculator
Calculate moderate and vigorous exercise heart rate zones using the Karvonen formula.
Open Calculator →TDEE Calculator
Calculate Total Daily Energy Expenditure from BMR and activity level.
Open Calculator →Anorexic BMI Calculator
Calculate BMI and see where it falls against WHO categories and a historical low-weight reference used in past eating-disorder diagnostic criteria.
Open Calculator →GFR Calculator
Estimate glomerular filtration rate (eGFR) and CKD stage from serum creatinine, age, and sex using the 2021 CKD-EPI equation.
Open Calculator →Healthy Weight Calculator
Find the WHO-defined healthy weight range for your height in metric or US customary units.
Open Calculator →Ideal Weight Calculator
Compare four classic ideal body weight formulas — Devine, Robinson, Miller, and Hamwi — from your height and sex.
Open Calculator →Overweight Calculator
Calculate BMI and see how much weight sits above the healthy-range ceiling for your height.
Open Calculator →Calorie Calculator
Calculate maintenance and goal-adjusted daily calorie targets using the Mifflin-St Jeor equation and your activity level.
Open Calculator →Carbohydrate Calculator
Convert daily calories and a carb percentage into grams of carbohydrate per day, checked against the recommended range.
Open Calculator →Body Type Calculator
Estimate your body frame size, small, medium, or large, from your height-to-wrist ratio.
Open Calculator →Bra Size Calculator
Estimate your bra band and cup size from band and bust measurements using the standard add-4 method.
Open Calculator →One Rep Max Calculator
Estimate your one-rep max from a submaximal lift using the Epley and Brzycki formulas side by side.
Open Calculator →Pace Calculator
Solve for pace, time, or finish distance in a running calculation from any two known values.
Open Calculator →Protein Calculator
Estimate your recommended daily protein intake in grams based on body weight and activity level.
Open Calculator →Shoe Size Conversion
Convert shoe sizes between US Men's, US Women's, UK, EU, and centimeters using a standard sizing chart.
Open Calculator →Weight Watcher Points Calculator
Estimate the classic 1997 WeightWatchers Points value for a food from calories, fat, and fiber. Not affiliated with WW.
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