⚖️ BMI Calculator
Calculate body mass index from height and weight.
About this tool
Calculates Body Mass Index (BMI) from your height and weight, and shows which standard weight category it falls into — a quick screening number, not a diagnosis.
If you know your height in feet and inches rather than centimeters, convert it first with the Height Converter, then plug the centimeter figure in here.
Worked example
A person who is 70 kg and 175 cm tall has a BMI of about 22.9, which falls in the "normal weight" range — pair this with the Height Converter if you know your height in feet and inches instead.
How to use it
- Choose metric (kg, cm) or imperial (lb, in) units.
- Enter your weight and height.
- Press Calculate BMI to see your result and category.
Tips
- BMI doesn't distinguish between muscle and fat, so it can be misleading for very muscular or very lean individuals.
- Categories (underweight, normal, overweight, obese) are population-level guidelines, not individual health verdicts.
- Talk to a healthcare provider for a fuller picture — BMI is one data point, not a diagnosis.
FAQ
Is BMI accurate for everyone?
No — it doesn't account for muscle mass, bone density, age, or body composition, so it's less reliable for athletes and older adults.
What BMI range is considered normal?
Roughly 18.5 to 24.9 is the standard "normal weight" range used by most health organizations.
Should I use this instead of seeing a doctor?
No — treat this as a quick reference, not medical advice.
📖 Want the fuller explanation?
See BMI vs Body Fat Percentage for the reasoning behind this calculation, with worked examples.