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Online Health Calculators

Filter health calculators by result

Filter by the result you want: view BMI, body-fat and body-measurement references, plan target body fat and weight-loss time, set daily energy and nutrition targets, or estimate caffeine, sugar, and water intake.

All Tools

14 tools available. Select one to open it here.

Macro Calculator

Calculate daily protein, fat, and carbohydrate targets from calories, weight, and your preferred allocation rule.

Carbohydrate Needs Calculator

Enter daily calories, weight, goal, training volume, and carbohydrate percentage to estimate daily carbohydrate grams, calories, and a reference range.

BMI Calculator

Calculate BMI, a healthy weight range, and adult screening categories from your height and weight.

Ideal Weight Calculator

Compare four classic ideal-weight formulas and the adult BMI reference range using your height and sex.

Body Fat Goal Calculator

Enter your current weight, body fat percentage, and daily calorie deficit to estimate your target weight, amount of fat you need to lose, and the time frame.

Waist-to-Hip Ratio Calculator

Enter sex, waist circumference, and hip circumference to calculate WHR and view common WHO adult reference cutoffs and measurement guidance.

Waist-to-Height Ratio Calculator

Enter waist circumference, height, and optional age to calculate WHtR, view a continuous adult reference band, and compare waist size with half your height.

Body Fat Calculator (U.S. Navy Method)

Estimate body fat percentage, fat mass, and lean mass from sex, height, weight, and body circumferences using the classic U.S. Navy method.

TDEE Calculator

Enter sex, age, height, weight, and activity level to estimate BMR, TDEE, and a maintenance-calorie range, with steps and training minutes to check the activity factor.

Calorie Deficit Calculator

Enter TDEE, select fat loss, maintenance or muscle gain mode, and instantly calculate target calories, daily difference, theoretical weekly change and planning range.

Caffeine Intake Calculator

Enter drink servings, volume, and caffeine per serving to estimate daily caffeine, source shares, and an adult reference comparison.

Sugar Intake Calculator

Enter daily calories and sugar sources to calculate added sugar, free sugars, and their share of energy.

Weight loss time calculator

Enter your current weight, target weight, and weekly weight loss rate to estimate the weeks required, target date, and planning range.

Water Intake Calculator

Estimate a daily beverage range from your weight, activity and heat or sweating, while keeping total-water AI separate.