BMI Calculator
Estimate adult BMI from height and weight with category context.
Check an adult BMI estimate quickly
Body mass index is a simple screening number: weight adjusted for height. This calculator accepts pounds and inches, converts them to metric units, and reports the BMI value with the standard adult category bands used for quick population-level screening.
For example, a 180 pound adult who is 70 inches tall has a BMI of about 25.8, which lands in the overweight band. That does not diagnose health by itself, but it gives a consistent reference point when reading charts, forms, or wellness plans.
Know what BMI cannot tell you
BMI is useful because the formula is transparent: kilograms divided by height in meters squared. It is also limited. It does not separate muscle from fat, account for pregnancy, or replace a clinician who can interpret labs, waist measurement, history, and goals. Your numbers stay local in the browser. Adults can also use it to sanity-check numbers from forms that report BMI without showing the math.
Frequently Asked Questions
What formula does this BMI calculator use?
It converts pounds to kilograms and inches to meters, then calculates BMI as kilograms divided by meters squared.
What do the BMI categories mean?
The adult categories are underweight below 18.5, healthy weight from 18.5 to under 25, overweight from 25 to under 30, and obesity at 30 or above.
Is BMI a diagnosis?
No. BMI is a screening measure. It does not measure body fat, muscle, pregnancy, age-related changes, or individual medical risk.
Is my height or weight uploaded?
No. The calculation runs in your browser and the page does not send your measurements anywhere.
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