What is the BMI Calculator?
Calculate your body mass index (BMI) from weight in kilograms and height in centimeters. Our health and fitness calculators use validated, published equations — such as Mifflin-St Jeor for metabolic rate and the U.S. Navy method for body fat — to give you a solid starting point for training and nutrition.
How to use the BMI Calculator
- Enter your weight, your height.
- Results update automatically as you type; you can also press Calculate.
- Read the output: bmi, category (adult who), healthy weight range for your height.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With weight = 70 kg, height = 175 cm, the BMI Calculator returns bmi: 22.9; category (adult who): Healthy weight; healthy weight range for your height: 56.7 – 76.3 kg.
Tips for better results
- Equations estimate population averages; your individual numbers may differ.
- Track trends over weeks rather than reacting to a single reading.
- Pair calculators with professional guidance for medical conditions, pregnancy or major diet changes.
⚠️ This tool provides general information and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified healthcare professional.
Frequently asked questions
What does the BMI Calculator do?
Calculate your body mass index (BMI) from weight in kilograms and height in centimeters.
How is it calculated?
The BMI Calculator uses this method: BMI = weight (kg) ÷ height (m)².
Can you show an example?
With weight = 70 kg, height = 175 cm, the BMI Calculator returns bmi: 22.9; category (adult who): Healthy weight; healthy weight range for your height: 56.7 – 76.3 kg.
Is the BMI Calculator accurate?
It uses standard published formulas and is tested against known values, but results are estimates for guidance. This tool provides general information and is not medical advice. It is not a substitute for diagnosis or treatment by a qualified healthcare professional.
Is this tool free and private?
Yes — the BMI Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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