BMI Calculator

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Your Measurements

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Results

Your BMI22.7Body Mass Index based on your height and weight
Healthy Weight Range (Low)125.3 lbsLower end of the healthy BMI range
Healthy Weight Range (High)168.6 lbsUpper end of the healthy BMI range
Underweight
Normal
Overweight
Obese
Normal

A BMI between 18.5 and 24.9 is considered healthy for most adults.

Body Mass Index (BMI) is a widely used screening tool that estimates body fat based on your height and weight. While it doesn't measure body fat directly, BMI correlates with more direct measures of body fat and can help identify potential weight-related health risks.

The BMI formula divides your weight in kilograms by the square of your height in meters. The resulting number falls into one of four categories: underweight (below 18.5), normal weight (18.5-24.9), overweight (25-29.9), or obese (30 and above).

How to Use This Calculator

  1. Select your preferred unit system (metric or imperial)
  2. Enter your weight
  3. Enter your height
  4. Your BMI and healthy weight range appear instantly

Formula

BMI is calculated using the formula: BMI = weight (kg) / height (m)²

For example, a person weighing 70 kg and measuring 1.75 m tall would have a BMI of: 70 / (1.75 × 1.75) = 22.9

For imperial units, the formula is: BMI = 703 × weight (lbs) / height (in)²

Frequently Asked Questions

Is BMI accurate for everyone?

BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes or muscular individuals may have a high BMI without excess fat. It also doesn't account for age, sex, ethnicity, or body composition. It's best used as a starting point, not a diagnostic tool.

What is a healthy BMI range?

A BMI between 18.5 and 24.9 is generally considered healthy for most adults. However, optimal BMI can vary based on age, sex, and individual health factors. Consult with a healthcare provider for personalized guidance.

How often should I check my BMI?

Checking your BMI a few times per year is generally sufficient for most adults. If you're actively working on weight management, monthly checks can help track progress. Remember that BMI is just one indicator of health.

Does BMI apply to children?

BMI is calculated the same way for children and adults, but the interpretation differs. For children and teens (ages 2-20), BMI is assessed using age- and sex-specific percentiles rather than fixed categories.