BMI formula
BMI = weight in kg divided by height in metres squared. Example: 70 / (1.75 × 1.75) = 22.9 — healthy.
BMI chart
- Below 18.5 — Underweight
- 18.5–24.9 — Healthy
- 25–29.9 — Overweight
- 30+ — Obese
Steps
- Weigh yourself and measure height.
- Open the BMI Calculator.
- Enter values, get instant BMI + category.
- Track weekly to see trends.
Related tools
- BMI Calculator — instant BMI.
- Percentage Calculator — track weight-loss %.
- Unit Converter — lbs/feet to kg/metres.
Frequently Asked Questions
How do I calculate BMI?
BMI = weight(kg) / height(m) squared. Example: 70kg / (1.75 x 1.75) = 22.9. Use the free calculator for instant results.
What is a good BMI?
18.5-24.9 is healthy, below 18.5 underweight, 25-29.9 overweight, 30+ obese (WHO).
Is BMI accurate for everyone?
BMI is a screening tool, not a diagnosis. Athletes, pregnant women and elderly should consult a doctor.
How do I lower my BMI?
Balanced diet + regular activity. Track weekly with the free BMI calculator.
Is my data private?
Yes. All calculation happens in your browser — nothing is uploaded.