Health Tools
20 free health calculators — body metrics, fitness, nutrition. Instant results, no signup.
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Body Metrics
8BMI Calculator
Body Mass Index with WHO category — underweight, normal, overweight, obese.
Ideal Weight Calculator
Devine, Robinson, and Miller formulas for ideal body weight — side by side.
Body Fat Calculator
US Navy method (waist + neck + hip) and BMI method side-by-side.
Lean Body Mass Calculator
LBM estimate using the Boer formula — weight minus fat mass.
Waist-Hip Ratio Calculator
Cardiovascular risk indicator — waist circumference ÷ hip circumference.
Calorie Calculator (TDEE)
Daily calorie needs using Mifflin-St Jeor + activity level.
Protein Calculator
Daily protein target by weight, activity, and goal.
Water Intake Calculator
Daily hydration needs by bodyweight + exercise + climate.
Fitness & Exercise
6One Rep Max Calculator
Estimate your 1RM from any rep set using Epley, Brzycki & Lombardi formulas — plus a strength % chart.
Calories Burned Calculator
Calories burned during exercise — uses MET values for 18 common activities + your bodyweight.
Running Pace Calculator
Pace, speed, and split times from any distance + time — works for both km and miles.
Heart Rate Zone Calculator
Your 5 training zones using the Karvonen formula — accounts for your resting heart rate, not just age.
VO2 Max Calculator (Cooper Test)
Estimate your VO2 max from a 12-minute all-out run, with age- and gender-adjusted fitness rating.
Steps to Calories Calculator
Convert daily steps into calories burned and distance covered — accounts for your weight & height.
Nutrition
1General Health
5BMI Calculator for Children
Pediatric BMI with rough CDC percentile category for children and teens aged 2–19.
Pregnancy Due Date Calculator
Estimated due date from last menstrual period, conception date, or IVF transfer date.
Blood Pressure Calculator
AHA blood-pressure category — normal, elevated, stage 1, stage 2, or hypertensive crisis.
Sleep Calculator
90-minute REM cycle bedtimes and wake times — wake at the end of a cycle, not in the middle of one.
Age Calculator
Exact age in years, months, days, hours, and minutes — plus countdown to next birthday.
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