BMI Calculator
BMI = Weight (kg) ÷ Height (m)²70 ÷ (1.70)² = 70 ÷ 2.89 ≈ 24.2
Free online tool
BMI Calculator
Enter your height and weight to find your BMI and see which weight category you fall into.
Instant calculation
Calculate Your BMI
Enter your height and weight.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter height
Type your height in centimeters.
- 02
Enter weight
Type your weight in kilograms.
- 03
Read your BMI
Calculate to see your BMI value and weight category.
The formula
How this calculation works
Divide your weight in kilograms by the square of your height in meters. Categories: underweight (<18.5), normal (18.5-24.9), overweight (25-29.9), obese (30+).
Check the method
Worked examples
Each example follows the same formula used by the calculator.
What is the BMI for 70 kg and 170 cm?
70 ÷ (1.70)² = 70 ÷ 2.89 ≈ 24.2BMI ≈ 24.2 (normal weight)Common questions
Questions about this calculation
What is the BMI Calculator?
The BMI Calculator helps you calculate your Body Mass Index from your height and weight. Enter your values and select Calculate to get an instant result.
How is the result calculated?
Divide your weight in kilograms by the square of your height in meters. Categories: underweight (<18.5), normal (18.5-24.9), overweight (25-29.9), obese (30+).
Can you show an example?
Example: What is the BMI for 70 kg and 170 cm? — BMI ≈ 24.2 (normal weight).
Is my data saved when I use the BMI Calculator?
No. All calculations run locally in your browser. Your inputs and results are never uploaded, stored or shared with anyone.
Is the BMI Calculator free to use?
Yes. The BMI Calculator is completely free. No account, sign-up or payment is required. It works on mobile, tablet and desktop.
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