Health & Fitness Calculators
Calculators for body mass index, body fat, nutrition, pregnancy, and workout pacing.
BMI Calculator
Calculate Body Mass Index, health category, and healthy target weight range.
BMI Calculator for Kids
Calculate BMI-for-age percentile for children aged 2–12 using CDC growth charts to identify underweight, healthy, overweight, or obese categories.
BMI Calculator for Men
Calculate BMI with male-specific healthy range context, body fat interpretation, and muscle-adjusted analysis for men.
BMI Calculator for Teens
Calculate BMI-for-age percentile for teenagers aged 13–17 using CDC sex-specific growth charts and puberty-adjusted thresholds.
BMI Calculator for Women
Calculate BMI with female-specific body fat context, pregnancy considerations, and age-adjusted interpretation for women.
BMI Weight Loss Calculator
Calculate how much weight you need to lose to reach a target BMI, and estimate how long it will take at a chosen weekly loss rate.
Geriatric BMI Calculator
Calculate BMI with age-adjusted interpretation for adults aged 65 and over, including sarcopenia risk and malnutrition screening.
Calorie Calculator
Estimate daily caloric needs for weight maintenance, loss, or muscle gain (BMR & TDEE).
ABSI Calculator - A Body Shape Index
Calculate A Body Shape Index (ABSI), a mortality risk predictor based on waist circumference relative to BMI and height.
Adjusted Body Weight Calculator
Calculate Adjusted Body Weight (AdjBW) for accurate medication dosing and clinical nutrition in obese or underweight patients.
BAI Calculator - Body Adiposity Index
Calculate Body Adiposity Index (BAI) to estimate body fat percentage using only hip circumference and height—no weight scale required.
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method from neck, waist, and hip measurements — no scale required.
Body Frame Size Calculator
Determine your skeletal frame size (small, medium, large) using wrist circumference or elbow breadth measurements.
Target Heart Rate Calculator
Find your target aerobic and anaerobic heart rate training zones.
Ideal Weight Calculator
Compare your ideal body weight across 4 clinical formulas: Devine, Robinson, Miller, and Hamwi — side by side.
Macro Calculator
Calculate exact daily grams of protein, carbohydrates, and fats for your fitness goal.
Running Pace Calculator
Calculate running pace, splits, distance, and finish times for 5k, 10k, half & full marathons.
Pregnancy Due Date Calculator
Estimate baby's expected due date, current gestational week, and key trimesters.
Protein Calculator
Find your optimal daily protein intake based on body weight and workout intensity.
One Rep Max (1RM) Calculator
Calculate your estimated 1-Rep Max and percentage training loads for strength exercises.
Calories Burned Calculator
Estimate calories expended across over 30 physical exercises and daily activities.
Body Shape Calculator
Determine your body shape (Apple, Pear, Hourglass, Rectangle, Inverted Triangle) using bust, waist, and hip measurements.
BRI Calculator — Body Roundness Index
Calculate Body Roundness Index (BRI), a 2013 elliptical body model that predicts visceral fat and mortality risk better than BMI.
BSA Calculator — Body Surface Area
Calculate Body Surface Area (BSA) using the Mosteller, DuBois, Haycock, or Boyd formulas for chemotherapy and drug dosing.
Draw Length Calculator
Calculate your archery draw length from arm span or height to properly fit a recurve or compound bow.
Bedridden Patient Height Calculator
Estimate full standing height from ulna length, knee height, or demi-span for patients who cannot stand — used in clinical nutrition and drug dosing.
Face Shape Calculator
Determine your face shape (Oval, Round, Square, Heart, Oblong, Diamond) using forehead, cheekbone, jaw, and face length measurements.
FFMI Calculator — Fat-Free Mass Index
Calculate Fat-Free Mass Index (FFMI) to assess lean muscle development and detect potential steroid use, adjusted for height.
Karvonen Formula Calculator
Calculate personalised heart rate training zones 1–5 using the Karvonen formula based on your age and resting heart rate.
Lean Body Mass Calculator
Calculate lean body mass (muscle, bone, organs, water) using the Boer, James, or Hume formula from weight, height, and sex.
Overweight Calculator
Find out if you are underweight, normal, overweight, or obese using BMI and excess weight above your ideal body weight.
Ponderal Index Calculator
Calculate Ponderal Index (PI), a height-cubed alternative to BMI that better accounts for body proportions in tall and short individuals.
RFM Calculator — Relative Fat Mass
Calculate Relative Fat Mass (RFM), a 2018 tape-measure method that estimates body fat percentage more accurately than BMI using waist and height.
Skinfold Body Fat Calculator
Estimate body fat percentage from skinfold caliper measurements using Jackson-Pollock 3-site or 7-site formulas.
Waist to Hip Ratio Calculator
Calculate Waist-to-Hip Ratio (WHR) to assess abdominal fat distribution and cardiovascular disease risk.
Waist to Height Ratio Calculator
Calculate Waist-to-Height Ratio (WHtR) — the simplest universal health screening tool. The rule: keep your waist under half your height.
Weight Loss Percentage Calculator
Calculate the exact percentage of body weight lost and project how long it will take to reach your goal weight.