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BMI Calculator

Calculate your Body Mass Index (BMI) with imperial or metric units. See your BMI category, visual scale, and healthy weight range.

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Your Measurements

Your BMI

24.4

Normal

UnderweightNormalOverweightObese

Healthy Weight Range

128.9 - 173.5 lbs
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How to Use BMI Calculator

  1. 1

    Choose units

    Select imperial (lbs, ft/in) or metric (kg, cm).

  2. 2

    Enter weight

    Enter your weight in the selected unit.

  3. 3

    Enter height

    Enter your height in the selected unit.

  4. 4

    View results

    See your BMI value, category, visual scale, and healthy weight range.

Frequently Asked Questions

Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated as weight (kg) divided by height (m) squared. While not perfect, it's a useful screening tool for weight categories.

Underweight: below 18.5. Normal weight: 18.5 to 24.9. Overweight: 25 to 29.9. Obese: 30 and above. These ranges are based on WHO guidelines.

BMI doesn't distinguish between muscle and fat, so athletes may have a high BMI despite being healthy. It also doesn't account for age, gender, or body composition. Consult a healthcare provider for a complete assessment.

BMI = weight (kg) / height (m)^2. For imperial units: BMI = (weight in lbs / height in inches^2) * 703.

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Understanding BMI: Uses and Limitations

BMI was created in the 1830s as a population-level statistical tool, not an individual health diagnostic. The formula — weight in kilograms divided by height in meters squared — correlates with body fat at large scales but misclassifies individuals regularly. A muscular 200-pound athlete and a sedentary 200-pound person of the same height get identical BMI scores despite vastly different health profiles.

BMI Thresholds Vary by Ethnicity

The standard WHO cutoffs (overweight at 25, obese at 30) were derived primarily from European populations. Research shows that South Asian, East Asian, and Southeast Asian populations develop metabolic complications at lower BMI values. The WHO recommends lower cutoffs for Asian populations: overweight at 23, obese at 27.5. If you are of Asian descent, these adjusted thresholds provide a more accurate risk assessment.

Better Metrics to Track

Waist-to-height ratio (keep it below 0.5) is a stronger predictor of cardiovascular risk than BMI. Body fat percentage, measured via DEXA scan or skinfold calipers, directly measures what BMI only estimates. For most people, BMI is a reasonable starting point — but if you exercise regularly, carry significant muscle mass, or fall near a category boundary, supplement it with waist measurements or body composition testing.