Health Calculators
Practical health and fitness tools to help you plan, track, and make better daily decisions.
Fitness
BMI Calculator
Estimate body mass index from height and weight.
Calorie Calculator
Estimate BMR and daily calorie targets with multiple formulas and activity levels.
Body Fat Calculator
Estimate body fat with U.S. Navy or BMI methods, plus category guidance.
BMR Calculator
Calculate BMR with multiple formulas and estimate daily calorie needs by activity level.
Ideal Weight Calculator
Estimate ideal weight with Devine formula.
Pace Calculator
Compute running pace, speed, and race time projections.
Army Body Fat Calculator
Estimate body fat % and compare to screening thresholds.
Lean Body Mass Calculator
Estimate lean body mass using the Boer formula.
Healthy Weight Calculator
Show healthy weight range based on BMI 18.5-24.9.
Calories Burned Calculator
Estimate calories burned from MET, body weight, and time.
One Rep Max Calculator
Estimate one-rep max from lifted weight and reps.
Target Heart Rate Calculator
Compute training heart-rate zone using the Karvonen method.
Pregnancy
Pregnancy Calculator
Estimate due date and current gestational age from LMP.
Pregnancy Weight Gain Calculator
Estimate recommended weight gain range based on BMI.
Pregnancy Conception Calculator
Estimate conception date from an expected due date.
Due Date Calculator
Estimate due date from LMP or conception date.
Ovulation Calculator
Estimate ovulation day and fertile window.
Conception Calculator
Estimate likely conception date window from cycle timing.
Period Calculator
Predict upcoming period start dates.
Other
Macro Calculator
Convert macro percentage split into grams per day.
Carbohydrate Calculator
Estimate carbohydrate grams from calories and carb ratio.
Protein Calculator
Estimate daily protein needs from body weight and activity.
Fat Intake Calculator
Estimate fat grams from calorie target and fat ratio.
TDEE Calculator
Estimate total daily energy expenditure.
GFR Calculator
Estimate eGFR with 2021 CKD-EPI creatinine equation.
Body Type Calculator
Classify body type from BMI and waist-to-hip ratio.
Body Surface Area Calculator
Calculate body surface area using Mosteller formula.
BAC Calculator
Estimate blood alcohol concentration with Widmark equation.