BMI Calculator
Check your Body Mass Index in seconds.
BMI is a quick screening estimate — it doesn't account for muscle, bone or body composition. Treat it as a starting point, not a diagnosis.
About the BMI Calculator
Free BMI calculator. Enter your height and weight to instantly find your Body Mass Index and see which category you fall into. Metric and imperial units, no signup.
Everything is calculated instantly in your browser — nothing you type is uploaded or stored. Bookmark Calcooly for the next time you need it.
How to use the BMI Calculator
- 1Choose metric (cm/kg) or imperial (ft/in, lb).
- 2Enter your height and weight.
- 3Your BMI and category appear instantly.
Frequently asked questions
What is a healthy BMI?+
A BMI between 18.5 and 24.9 is generally considered healthy. Below 18.5 is underweight and 25 or above is overweight.
Is BMI accurate for everyone?+
BMI is a quick screening tool. It doesn't account for muscle, bone density or body composition, so athletes and very muscular people may read high despite low body fat.
Is the result exact?+
It's a reliable estimate for general information. For important financial, medical or legal decisions, check with a qualified professional.