All Health Calculators
Free health calculators for BMI, BMR, body fat, ideal weight, TDEE, and more. Based on WHO and medical standards.
15 free calculators
BMI Calculator
Calculate your BMI instantly with WHO standards. Find your weight category and healthy weight range. Includes tips. Free bmi calculator, no sign-up required.
BMR Calculator
Calculate your basal metabolic rate (BMR) with the Mifflin-St Jeor formula. See how many calories you burn at rest. Free, science-backed, no sign-up.
Body Fat Calculator
Estimate body fat percentage via the US Navy circumference method. Enter height, neck, waist (and hip for women). Free, science-backed, no sign-up.
Calorie Calculator
Calculate your daily calorie needs using the Mifflin-St Jeor equation. Get personalized targets for weight loss, maintenance, and muscle gain. Free, no sign-up.
Calorie Deficit Calculator
Calculate the exact daily calorie deficit to lose weight at a safe rate. CDC/NIH-aligned, uses TDEE and the 7,700 kcal/kg rule. Free, no sign-up.
Due Date Calculator
Calculate your pregnancy due date using last menstrual period, conception date, or IVF transfer date. Get trimester dates and key milestones. Free & accurate.
Height Calculator
Ideal Weight Calculator
Macro Calculator
Macro calculator for daily protein, carb, and fat targets based on Mifflin-St Jeor TDEE and your goal. Science-backed, free, no sign-up.
Ovulation Calculator
Find ovulation date and fertile window based on last period and cycle length. Track conception with accurate predictions. Free ovulation calculator, no sign-up.
Pregnancy Calculator
Calculate your due date, current week of pregnancy, trimester, and key milestones. Based on last menstrual period or conception date. Free pregnancy tracker.
Sleep Calculator
Find ideal bedtime or wake-up time based on 90-minute REM sleep cycles. Use our sleep calculator to wake up refreshed. Free online tool, no sign-up required.
Sleep Debt Calculator
TDEE Calculator
Calculate TDEE with Mifflin-St Jeor BMR × activity multiplier (1.2–1.9). See maintenance calories and loss/gain targets. Free, science-backed.
Waist-to-Height Ratio Calculator
Calculate your waist-to-height ratio (WHtR). A better cardiometabolic risk marker than BMI for most adults. Instant risk zones + interpretation.