What are the BMI categories?

The standard BMI categories for adults are: Underweight (BMI below 18.5), Normal weight (18.5–24.9), Overweight (25.0–29.9), and Obese (30.0 and above). These thresholds may vary slightly by age, sex, and ethnicity. For children and teens, BMI is interpreted using age- and sex-specific percentiles.

What are the limitations of BMI?

BMI does not directly measure body fat. It can misclassify people with high muscle mass as overweight (e.g., athletes), and it doesn't account for fat distribution, bone density, or age-related changes. It is also less accurate for very tall or very short individuals. Always consult a healthcare professional for a comprehensive health evaluation.

What is a healthy BMI for adults?

A BMI between 18.5 and 24.9 is considered healthy for most adults. To stay in this range, you can calculate your healthy weight range: multiply your height in meters squared by 18.5 (lower bound) and 24.9 (upper bound). For example, a person 1.70 m tall should weigh between 53.5 kg and 71.9 kg for a healthy BMI.

Does BMI differ for men and women?

The BMI formula is the same for both men and women, but the meaning can differ. Women naturally have more body fat than men at the same BMI. Some health professionals use different reference ranges or supplement BMI with other measurements like waist circumference for a more accurate health assessment.

Body Mass Index (BMI) Calculator

2on / / Calculators / Fitness and Health Calculators / BMI Calculator

BMI Calculator

Calculate your Body Mass Index (BMI) to assess your weight relative to your height. Enter your height and weight to get your BMI and weight category instantly.

Unit System

Age

Gender

Height

Weight

Frequently Asked Questions

BMI (Body Mass Index) is a numerical value derived from your weight and height. The formula is: BMI = weight (kg) / height² (m). For example, a person who is 70 kg and 1.75 m tall has a BMI of 22.9. In imperial units: BMI = (weight in lbs × 703) / height² (inches). It provides a simple way to classify weight categories.

Most Popular Fitness and Health Calculators

All Time

Body Fat Calculator - Estimate Your Body Fat Percentage

1035 hits

Calorie Calculator - Daily Calorie Needs & TDEE

1010 hits

Ideal Weight Calculator - Find Your Healthy Weight Range

982 hits

Waist-to-Hip Ratio Calculator - Check Your Health Risk Level

970 hits

Water Intake Calculator - Daily Hydration Needs by Weight & Activity

897 hits

New

Target Heart Rate Calculator Calculate your target heart rate zones for fat burn, cardio, and peak performance. Based on age and resting heart rate using the Karvonen formula.

View Page

Popular Today

Body Fat Calculator Calculate your body fat percentage using the U.S. Navy method. Enter your measurements to estimate body fat and fitness category.

View Page

Related Fitness and Health Calculators

Ideal Weight Calculator Calculate your ideal body weight based on height, age, and gender using Hamwi, Devine, and Robinson formulas.

Calorie Calculator Free calorie calculator to find your daily calorie needs using the Mifflin-St Jeor formula. Calculate TDEE based on age, weight, height, and activity.

Body Fat Calculator Calculate your body fat percentage using the U.S. Navy method. Enter your measurements to estimate body fat and fitness category.

Water Intake Calculator Calculate your daily water intake based on weight, activity level, and climate. Get personalized hydration recommendations in liters and ounces.

Fitness Goal Timeline Calculator Estimate how long it will take to reach your fitness goal. Calculate your timeline based on current stats, target, and weekly effort.

Other Calculators You May Like

Age Calculator Free online age calculator. Calculate your exact age in years, months, days, hours and minutes. Find out how old you are and when is your next birthday.

Date Difference Calculator Free online date difference calculator. Calculate the exact time between two dates in years, months, days, hours, and minutes. Find working days, total weeks, and detailed time analysis.

Day of the Week Calculator Free day of the week calculator. Find out what day of the week any date falls on - past, present, or future. Perfect for planning events, checking historical dates, and finding birth day of the week.

Business Days Calculator Free online business days calculator. Calculate working days between two dates, excluding weekends. Perfect for project planning, deadline calculations, and business scheduling.

Week Number Calculator Free online ISO 8601 week number calculator. Find out which week of the year any date falls on. Perfect for project planning, scheduling, and calendar management.