Free Online Health Calculators - BMI, BMR, Body Fat & More

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BMI Calculator

Free online BMI calculator. Calculate your Body Mass Index instantly. Supports imperial (lbs/ft) and metric (kg/cm). Includes BMI categories and healthy weight range.

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BMI Prime Calculator

Calculate BMI and BMI Prime — the ratio of your BMI to the normal upper limit. BMI Prime of 1.0 or less means healthy. Free online BMI Prime calculator.

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BMR Calculator

Free online BMR calculator. Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. Find your maintenance calories for weight management.

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Body Fat Calculator

Free online body fat calculator. Estimate your body fat percentage using measurements or the US Navy method. Track your fitness progress.

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Calorie Calculator

Free online calorie calculator. Calculate your daily calorie needs based on age, height, weight, activity level, and fitness goals. Includes macro breakdown.

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Macro Calculator

Calculate your daily macronutrient needs — protein, carbs, and fat — based on BMR, activity level, and weight goal. Free macro calculator for diet planning.

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Pregnancy Due Date Calculator

Free online pregnancy due date calculator. Estimate your due date based on last menstrual period or conception date. See weekly pregnancy timeline.

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Sleep Cycle Calculator

Calculate optimal bedtime or wake-up time based on 90-minute sleep cycles. Wake up refreshed at the end of a cycle. Free sleep cycle calculator.

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Water Intake Calculator

Free online water intake calculator. Calculate how much water you should drink daily based on your weight, activity level, and climate. Stay hydrated.