Calculator category
Fitness & Health Calculators
Free health and fitness calculators for practical estimates, body metrics, exercise, and wellness planning.
31 published calculators in this category.
Use health and fitness calculators as practical estimates
Health and fitness calculators can help with common measurements and planning, but individual results vary. Pay attention to the units, assumptions, and interpretation provided with each tool.
- ✓ Use the correct units and measurements for the calculator.
- ✓ Treat estimates as a starting point, especially for calorie and exercise planning.
- ✓ For medical decisions, use qualified professional guidance alongside any calculator estimate.
Browse fitness & health calculators
Choose a tool below to calculate a result and review the method behind it.
BMI Calculator
Calculate your Body Mass Index (BMI) using metric or imperial units. Get your weight category and healthy weight range.
Open calculator →Calorie Calculator
Calculate your daily calorie needs using the Mifflin-St Jeor formula. Find your BMR and TDEE for weight loss or gain.
Open calculator →Pace Calculator
Calculate running pace from distance and elapsed time.
Open calculator →Ideal Weight Calculator
Estimate a reference weight from height using a BMI-based midpoint.
Open calculator →Period Calculator
Estimate the next cycle day from cycle length.
Open calculator →TDEE Calculator
Estimate total daily energy expenditure from BMR and an activity multiplier.
Open calculator →Ovulation Calculator
Estimate ovulation cycle day from cycle length.
Open calculator →GFR Calculator
Estimate adult eGFR with the race-free CKD-EPI 2021 creatinine equation.
Open calculator →BAC Calculator
Estimate blood alcohol concentration using a Widmark-style model.
Open calculator →Anorexic BMI Calculator
Calculate BMI and flag values below the standard underweight threshold; it is not a diagnosis.
Open calculator →BMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor equation.
Open calculator →Macro Calculator
Estimate daily carbohydrate and fat gram targets from calorie and macro assumptions.
Open calculator →Protein Calculator
Estimate daily protein grams from body weight and a grams-per-kilogram target.
Open calculator →Carbohydrate Calculator
Estimate carbohydrate grams from daily calories and a carbohydrate share.
Open calculator →Fat Intake Calculator
Estimate daily fat grams from a calorie target and fat-share range.
Open calculator →Healthy Weight Calculator
Estimate a BMI-based healthy weight range from height.
Open calculator →Lean Body Mass Calculator
Estimate lean body mass from weight and height using a validated population formula.
Open calculator →Calories Burned Calculator
Estimate calories burned from body weight, MET, and exercise duration assumptions.
Open calculator →Target Heart Rate Calculator
Estimate a maximum heart-rate reference from age.
Open calculator →One Rep Max Calculator
Estimate one-repetition maximum from a lifted load and repetitions.
Open calculator →Weight Watcher Points Calculator
Estimate a simplified points score from entered nutrition and body inputs.
Open calculator →Overweight Calculator
Calculate BMI and compare it with an overweight reference threshold.
Open calculator →Body Fat Calculator
Estimate body-fat percentage from entered body measurements.
Open calculator →Army Body Fat Calculator
Estimate body-fat percentage from body measurements using a screening equation.
Open calculator →Body Surface Area Calculator
Estimate body surface area from height and weight.
Open calculator →Body Type Calculator
Classify a BMI-based body type for educational screening.
Open calculator →Pregnancy Calculator
Estimate weeks remaining from a pregnancy-week input.
Open calculator →Pregnancy Weight Gain Calculator
Estimate a simplified pregnancy weight-gain range by pregnancy week.
Open calculator →Pregnancy Conception Calculator
Estimate pregnancy timing from cycle and gestational assumptions.
Open calculator →Due Date Calculator
Estimate pregnancy timing and remaining days from completed weeks.
Open calculator →Conception Calculator
Estimate a conception timing window from cycle inputs.
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