Health Calculators
BMI, TDEE, BMR, body fat, ideal weight, pregnancy due date, and ovulation calculators. Estimates only — not medical advice. Free, instant, client-side.
BMI Calculator
Calculate body mass index with metric or imperial units and see your BMI category.
BMR & Calorie Calculator
Estimate basal metabolic rate and daily calories (TDEE) by age, sex, height, weight, and activity.
TDEE Calculator
Calculate total daily energy expenditure (maintenance calories) from BMR, activity level, and optional body fat %.
BMR Calculator
Calculate basal metabolic rate with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formulas.
Body Fat Percentage Calculator
Estimate body fat percentage with the US Navy circumference method or a BMI-based estimate.
Ideal Weight Calculator
Estimate ideal body weight with Robinson, Miller, Devine, and Hamwi formulas plus BMI healthy range.
Pregnancy Due Date Calculator
Estimate your pregnancy due date from last menstrual period, conception date, ultrasound, or IVF transfer.
Ovulation Calculator
Estimate ovulation day and fertile window from last period date, cycle length, and luteal phase.
Sleep Calculator
Find ideal bedtimes or wake times based on 90-minute sleep cycles so you wake between cycles.
Macro Calculator
Calculate daily protein, carbohydrate, and fat targets from TDEE, activity level, and your nutrition goal.
Water Intake Calculator
Estimate daily water needs in liters and ounces from body weight, activity, climate, exercise, pregnancy, and breastfeeding.
Running Pace Calculator
Calculate running pace, speed, finish time, and even splits for 1K, 5K, 10K, half marathon, marathon, or custom distance.
Heart Rate Zone Calculator
Find training heart-rate zones 1–5 using 220−age, Tanaka, or Karvonen methods from age and resting heart rate.
Period Calculator
Estimate your next period date, fertile window, and safer days from last period start, cycle length, and period length.