BMI Calculator
Body Mass Index from height and weight, with context. e.g. “What is my BMI at 175 cm and 72 kg?”
Enter your values
Results update as you type. All calculation happens in your browser.
Methodology
Body Mass Index from height and weight, with context. This tool uses a standard, documented formula and runs entirely on your device.
Last reviewed January 2026 · Runs client-side
What BMI does and doesn't tell you
Body Mass Index is a quick screening number that relates weight to height. It's widely used because it's easy to calculate and gives a rough population-level sense of whether someone is under-, over-, or within a typical healthy weight range.
It is not a diagnosis. BMI doesn't distinguish muscle from fat, ignores where weight is carried, and can misclassify very athletic or older people. Treat it as one rough indicator among many, and speak with a healthcare professional for anything that matters to your health.
How to use this calculator
- Choose metric or imperial units.
- Enter your height and weight.
- Read your BMI, its general category, and the healthy weight range for your height.
What the inputs mean
- Units
- Switch between centimetres/kilograms and feet-inches/pounds.
- Height & weight
- Used together in the standard BMI formula.
At 175 cm and 72 kg, BMI is about 23.5, within the commonly cited healthy range of 18.5 to 24.9.
The formula, in plain terms
BMI = weight in kilograms ÷ height in metres squared. Imperial inputs are converted to metric first.
Good to know
- BMI overestimates body fat in muscular people and underestimates it in some older adults.
- The healthy-range figures are general guidance, not personalised targets.
Frequently asked questions
Is BMI accurate for athletes?
Often not, muscle is dense, so athletes can have a high BMI while carrying little fat. Body composition measures are more informative for them.
Does BMI differ for children?
Yes. Children and teens use age- and sex-specific percentile charts rather than the adult categories shown here.
Last reviewed January 2026. This explainer is general information, not professional advice.