Body Mass Index (BMI) Calculator
Enter your height and weight to calculate your BMI and see which category you fall into.
Your BMI result is for general information only and is not medical advice. For health concerns, always consult a qualified healthcare professional.
BMI is a screening tool based on your height and weight. It does not directly measure body fat and may not be accurate for athletes, pregnant women or children.
Frequently Asked Questions
What is BMI and how is it calculated?
BMI (Body Mass Index) is your weight in kilograms divided by the square of your height in meters. In imperial units: weight in pounds divided by height in inches squared, multiplied by 703.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered a normal, healthy range. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
Does the BMI calculator work in imperial units?
Yes — switch to imperial mode to enter your height in feet and inches and your weight in pounds. The calculator converts everything automatically and applies the correct BMI formula.
Is BMI accurate for athletes and muscular people?
BMI is a screening tool, not a direct measure of body fat. It can overestimate body fat in very muscular athletes and underestimate it in older adults. Use it as a general guide alongside other health indicators.
Is the BMI scale the same for men and women?
For adults, the same BMI categories apply to both men and women. The healthy range can vary slightly by country, but 18.5–24.9 is the widely used international standard.
Is the BMI calculator free to use?
Yes — completely free, no sign-up required, and your height and weight never leave your device since everything runs in your browser.
What is my BMI if I am 170 cm and weigh 70 kg?
For a height of 170 cm and a weight of 70 kg, your BMI is 24.2, which is inside the healthy range of 18.5–24.9. Simply enter your own measurements to get your number instantly.
What is a healthy BMI for a 5′9" person?
For a height of 5 feet 9 inches, a healthy BMI (18.5–24.9) corresponds to a weight of roughly 125–168 lb. You can switch the calculator to imperial units to check any combination.
BMI Calculator — Know Your Numbers in Seconds
Body Mass Index is one of the simplest ways to check whether your weight is in a healthy range for your height. Our free BMI calculator does the math instantly — just enter your height and weight, and you get your BMI value, your category, and a visual marker on the standard BMI scale. Switch between metric and imperial units with one tap.
Why use this BMI calculator
- Instant BMI calculation with automatic category classification.
- Metric (kg/cm) and imperial (lb/ft) unit support.
- Clear visual scale showing where your BMI falls.
- Friendly, practical guidance for every category.
- Uses the international WHO BMI classification standard.
- 100% private — your measurements never leave your device.
How you can use the BMI calculator
- Checking whether your weight is in the healthy range.
- Tracking your BMI as you start a fitness or diet plan.
- Understanding your doctor's BMI category during a check-up.
- Helping family members quickly screen their numbers.
- Converting your measurements to compare against international charts.
- Learning how height and weight interact in the BMI formula.
Whether you are starting a fitness journey, preparing for a check-up, or simply curious about your numbers, this BMI calculator gives you a reliable answer in seconds. Bookmark it and come back whenever you want a quick, private health screening — no apps to install, no data to share.