Fitness & Health Calculators
Health and fitness calculators to help you track your wellness goals, fitness metrics, nutrition needs, and overall health journey.
Fitness & Health
BMI Calculator
Body mass index from height and weight (metric or US).
Calorie Calculator
Estimated daily calories by sex, age, size, and activity.
Body Fat Calculator
Estimate body fat percentage using US Navy circumference formulas.
Army Body Fat Calculator
2023 Army one-site abdomen tape method with maximum allowable % by age.
Lean Body Mass Calculator
Compare Boer, James, Hume, and Peters LBM estimates from weight and height.
BMR Calculator
Basal metabolic rate and daily calories by activity level.
Pregnancy Calculator
Due date from last menstrual period (280-day rule).
Pregnancy Conception
Conception estimate from due date, LMP with cycle, or ultrasound GA.
Pregnancy Weight Gain
Recommended gain ranges by pre-pregnancy BMI.
Calories Burned Calculator
Estimate calories burned during activities by duration or distance.
One Rep Max Calculator
Estimate maximum weight for one repetition from reps and weight.
Target Heart Rate
Target heart rate zones for exercise intensity based on age and resting HR.
Ideal Weight Calculator
Estimate ideal weight using BMI and clinical formulas plus frame size and current weight comparison.
Pace Calculator
Calculate run pace, speed, and finish time for different distances in kilometers or miles.
Due Date Calculator
The Due Date Calculator estimates the delivery date of a pregnant woman based on her last menstrual period (LMP), ultrasound, conception date, or IVF transfer date.
Macro Calculator
Daily protein, carb, and fat targets in grams based on your calorie goal and macro split.
Water Intake Calculator
Recommended daily water intake based on body weight, exercise, and climate.
Body Surface Area Calculator
Body surface area (BSA) using the Mosteller, Du Bois, or Haycock formulas.
Waist-to-Hip Ratio Calculator
Waist-to-hip ratio and health risk category based on WHO reference ranges.
BAC Calculator
Rough blood alcohol content estimate from drinks, body weight, and time elapsed.
Ovulation Calculator
Estimated ovulation date, fertile window, and next expected period.
Sleep Calculator
Best bedtime or wake-up time based on complete 90-minute sleep cycles.
VO2 Max Calculator
Estimate aerobic fitness (VO2 max) via the Cooper test or heart-rate ratio method.
Steps to Calories & Distance
Convert step count into walking distance and estimated calories burned.