Health & Fitness

BMI Calculator

Q: Is BMI accurate for muscular people?

No, BMI does not distinguish between muscle and fat. Athletes or bodybuilders might have a high BMI due to increased muscle mass, not body fat.

Q: What is a healthy BMI range?

For adults, a healthy BMI is between 18.5 and 24.9. This range is associated with the lowest risk of weight-related health issues.

Q: Does BMI apply to children?

BMI is calculated the same way for children and teens, but the result is compared against age- and sex-specific percentiles rather than fixed adult thresholds.

Q: How often should I check my BMI?

Checking your BMI a few times per year is sufficient for most adults. More frequent tracking is useful if you are actively working toward a weight goal.

Calculate your Body Mass Index and find your healthy range by age.

Measurement system

Weight

lbs

0 lbs500 lbs

Height — feet

0 ft7 ft

Height — inches

0 in11 in

Your BMI

25.8

Overweight

Healthy range: 18.5 – 24.9

Target BMI

Set a target BMI and your weight auto-adjusts

BMI Scale

Underweight

< 18.5

Normal

18.5–24.9

Overweight

25–29.9

Obese

≥ 30

What is Body Mass Index (BMI)?

This body mass index calculator gives you an instant screening number based on your height and weight. As an accurate bmi calculator for adults, it applies the same WHO classification used by clinicians to flag potential weight concerns. A high BMI can indicate high body fatness, but it does not directly measure body fat — it is a practical first-step assessment that correlates well with more precise measures.

Body Mass Index (BMI) is a person's weight in kilograms (or pounds) divided by the square of height in meters (or feet). The result places you in a category from Underweight to Obese, with the healthy bmi range 18.5–24.9 associated with the lowest risk of weight-related health issues.

BMI Formulas

For the Metric system: BMI = weight (kg) / height² (m²). For the Imperial system (US): BMI = (weight (lbs) / height² (in²)) × 703. Both formulas produce the same result — the 703 factor converts the US units to the standard kg/m² scale used by the World Health Organization.

Metric

kg / m²

e.g. 80 kg / (1.75 m)² = 26.1

Imperial

(lbs / in²) × 703

e.g. 180 lbs / (70 in)² × 703 = 25.8

Plan Your Next Step

Once you know your BMI, calculate your daily calorie budget using our BMR & TDEE Calorie Calculator.

Frequently Asked Questions about BMI

No, BMI does not distinguish between muscle and fat. Athletes or bodybuilders might have a high BMI due to increased muscle mass, not body fat.

For adults, a healthy BMI is between 18.5 and 24.9. This range is associated with the lowest risk of weight-related health issues.

BMI is calculated the same way for children and teens, but the result is compared against age- and sex-specific percentiles rather than fixed adult thresholds.

Checking your BMI a few times per year is sufficient for most adults. More frequent tracking is useful if you are actively working toward a weight goal.

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