Health Calculators
Free BMI, calorie, macro, water intake, and pregnancy due date calculators. All calculations run instantly in your browser — nothing stored.
BMI Calculator
Body mass index, category, and healthy-weight range from height and weight.
Open tool →Calorie Calculator
Daily calorie target (TDEE) from weight, activity, and goal — Mifflin-St Jeor.
Open tool →Water Intake Calculator
Daily water target in ounces and liters from weight, climate, and activity.
Open tool →Macro Calculator
Protein, carbs, and fat targets per day based on goal — cut, maintain, bulk.
Open tool →Due Date Calculator
Pregnancy due date and trimester from last menstrual period (Naegele's rule).
Open tool →Body Fat Percentage
Body fat % via the U.S. Navy circumference method — neck, waist, and hip.
Open tool →Ideal Weight Calculator
Ideal body weight via Devine, Hamwi, Robinson, and Miller formulas.
Open tool →Heart Rate Zones Calculator
Max heart rate and training zones 1-5 for endurance, fat-burn, and tempo work.
Open tool →Pregnancy Week Calculator
Exact weeks and days pregnant today plus current trimester from LMP.
Open tool →Ovulation Calculator
Most fertile days and ovulation date from cycle length and last period.
Open tool →