BMI Calculator for Adults: Pounds & Feet or Metric

2026 tax year figures·Updated Oct 30, 2026

Health and BMI illustrationFind your body mass index in US units (feet, inches, pounds) or metric, see which CDC category it falls in and the healthy weight range for your height.

How BMI is calculated

BMI = 703 × weight (lb) ÷ height (in)2, or weight (kg) ÷ height (m)2. A 5′9″, 170 lb adult has a BMI of 25.1.

Adult BMI categories (CDC)

BMICategory
Below 18.5Underweight
18.5 – 24.9Healthy weight
25.0 – 29.9Overweight
30.0 and aboveObesity

Healthy weight range by height

HeightBMI 18.5 – 24.9
5'4"108 - 145 lb
5'7"118 - 159 lb
5'10"129 - 174 lb
6'0"136 - 184 lb
6'3"148 - 199 lb

Frequently asked questions

Is BMI accurate?
BMI is a quick screening tool. It does not measure body fat directly, so very muscular people can score high and older adults can score low. Waist size and other health measures add context.
Can children use this calculator?
No. For ages 2–19, BMI is compared with age- and sex-specific percentiles; ask a pediatrician or use the CDC child BMI tool.
What should I do if my BMI is outside the healthy range?
Talk with a healthcare provider, who can look at your overall health rather than a single number.

Related calculators

For general information only; not medical advice.

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