BMI Calculator
Calculate your BMI (Body Mass Index) with US or metric units and see if you are in a healthy BMI range for your height and weight.
BMI is a general screening tool, not a medical diagnosis.
BMI calculator for men and women (US & metric)
This free BMI calculator lets you quickly calculate BMI for men and women using either US units (feet, inches, pounds) or metric units (cm, kg). It shows your body mass index and the corresponding BMI category so you can see whether you are underweight, at a healthy BMI, overweight or obese.
The formula behind every BMI body mass index calculation is: weight in kilograms divided by height in meters squared. In US units the same calculation can be written as: BMI = (weight in pounds ÷ height in inches²) × 703. The calculator above applies the correct formula automatically for you.
How to calculate BMI
To calculate body mass index, you need only two things: your height and your weight. In metric units the formula is: BMI = kg ÷ (m × m). In US units (ft/in, lbs) the BMI how to calculate formula is: BMI = (lbs ÷ inches²) × 703. The tool also works as a female BMI calculator and a BMI calculator male – choose your gender for a more personal result, even though the basic formula is the same.
Typical adult BMI categories:
- < 18.5 – Underweight
- 18.5 – 24.9 – Healthy BMI / normal weight
- 25 – 29.9 – Overweight
- ≥ 30 – Obesity
BMI chart and healthy BMI range
A BMI chart is just a visual version of the same calculation: it plots height and weight and shows the BMI zone. This calculator acts like an interactive BMI index chart – you enter your height and weight and it returns your mass index BMI and category instantly. Use it as a quick check to see whether your body mass ratio is in a healthy range.
Remember that healthy BMI depends on more than just weight and height: muscle mass, body composition and age all play a role. BMI is a useful starting point, but not a complete picture of your health.
This page is designed for all common searches around BMI: bmi calculator, calculate bmi, bmi body mass index, bmi calculator women, bmi calculator male, bmi chart, healthy bmi and different spellings like corporal mass index or body mass ratio.
Frequently asked questions about the BMI calculator
How does the BMI calculator work?
Enter your height and weight and choose US units (feet, inches, pounds) or metric units (cm, kg). The BMI calculator automatically applies the correct formula and shows your body mass index and category.
Is the calculated BMI exact?
The calculation itself is mathematically exact. However, BMI is an indicator and does not account for muscle mass, body fat percentage, age, or individual body composition.
Can I calculate BMI for men and women separately?
Yes. The calculator can be used as a BMI calculator for men and women. The formula is the same, but the interpretation of results may differ slightly.
How do I calculate BMI manually?
In metric units, BMI is calculated as weight in kilograms divided by height in meters squared. In US units, the formula is (weight in pounds ÷ height in inches²) × 703.
Is BMI suitable to determine whether I am healthy?
BMI provides a general indication of underweight, healthy weight, overweight, or obesity. It should be used as a starting point, not a medical diagnosis.