BMI Calculator for Women and Men
Calculate your body mass index, category, and healthy weight range with metric and imperial units.
Body mass index is one of the most common screening numbers used by doctors, trainers, and insurers to get a quick sense of whether a person's weight falls in a typical range for their height. This BMI calculator for women and men takes your height and weight in either imperial or metric units and instantly returns your BMI, your category, and a visual gauge showing exactly where you land between underweight and obese. It is built for anyone checking their own numbers before a doctor's visit, fitness coaches working with new clients, and people simply curious about the metric behind the term. Beyond the single BMI number, the calculator works backward to show your healthy weight range, the span of weights that would put you in the normal BMI category at your current height. Switch between metric and imperial at any time, and every result updates instantly with no page reload.
Your Details
Age and sex are recorded for context only. The standard BMI formula does not adjust based on these inputs.
23.5
NormalHealthy Weight Range
118.1 – 159.0 lb
Based on a BMI between 18.5 and 24.9 for your height
How to Use This Calculator
1. Choose imperial or metric units
Imperial uses feet, inches, and pounds. Metric uses centimeters and kilograms.
2. Enter your height and weight
Fill in both fields to calculate your BMI.
3. Enter your age and sex (optional context)
These are recorded for reference but do not change the BMI formula.
4. Read your BMI, category, and healthy weight range
The gauge shows visually where your BMI falls.
How It Works
Imperial Formula
703 × lbs ÷ inches²A 5'7" (67 in), 150 lb person: 703 × 150 ÷ 67² = 23.5, in the Normal category.
Metric Formula
kg ÷ meters²A 170 cm (1.7 m), 68 kg person: 68 ÷ 1.7² = 23.5, also Normal.
Frequently Asked Questions
How is BMI calculated?
In imperial units, BMI equals 703 times weight in pounds, divided by height in inches squared. In metric units, BMI equals weight in kilograms divided by height in meters squared.
What are the BMI categories?
A BMI below 18.5 is Underweight, 18.5 to 24.9 is Normal, 25 to 29.9 is Overweight, and 30 or above is Obese. The visual gauge on this page shows where your result falls.
Is BMI different for men and women?
The BMI formula itself is the same for everyone. This calculator collects sex and age for context, but standard BMI categories do not adjust the calculation based on either.
How is the healthy weight range calculated?
The calculator finds the weight that would produce a BMI of 18.5 at the low end and 24.9 at the high end, using your entered height, to show the full healthy weight range for your height.
Is BMI a perfect measure of health?
No. BMI does not account for muscle mass, bone density, or body composition, so athletes and very muscular individuals may show a higher BMI without excess body fat. It is best used as a general screening tool, not a diagnosis.