Health Calculators
9 free tools — no sign-up, instant results.
BMI Calculator
Calculate your BMI (Body Mass Index) with our free online tool. Includes WHO categories, health recommendations, and metric/imperial support.
Water Intake Calculator
Calculate daily water intake based on weight, activity level, exercise, and climate. Shows glasses and bottles needed.
Protein Calculator
Calculate daily protein needs based on body weight and activity level. Based on WHO RDA 0.8 g/kg up to 2.2 g/kg for bodybuilders.
Waist to Hip Ratio Calculator
Calculate your waist-to-hip ratio (WHR) and check cardiovascular risk using WHO standards. Supports cm and inches.
Target Heart Rate Zone Calculator
Calculate your target heart rate training zones from age and resting heart rate. Uses max HR (220-age) and the Karvonen formula for precise cardio zones.
Steps to Distance (Miles/KM) Calculator
Convert your step count into walking or running distance in miles and km, or find how many steps a target distance takes. Based on height and pace.
Baby Growth Percentile Calculator
Calculate your baby or toddler's weight, length, and head circumference percentile for age using CDC/WHO growth chart standards. Free, instant, for ages 0–36 months.
Intermittent Fasting Window & Timer Calculator
Free intermittent fasting calculator and timer. Pick 16:8, 18:6, 20:4, OMAD, 14:10, or a custom schedule to see when your fast ends and your eating window opens.
Barbell Plate Loading Calculator
Enter your target weight and bar type to see exactly which plates to load on each side of the barbell. Supports kg and lb, Olympic and training bars, and custom plate sets.