Free BMI Calculator
Enter your height and weight to see your Body Mass Index, your weight category, and a healthy weight range for your height. Works in kg/cm or lb/ft, on any phone.
For adults aged 18 and over. Not for children, teenagers or pregnant women.
What Is a BMI Calculator?
BMI (Body Mass Index) is a simple number that compares your weight with your height. Doctors and health organisations around the world use it as a quick screening tool to see whether a person is underweight, at a healthy weight, overweight, or in the obesity range.
Our calculator works out your BMI in one second and shows which category you fall into. It is useful for anyone who is interested in fitness and health.
Explore more handy browser utilities on our platform, such as the Free GPA & CGPA Calculator, to make your daily tracking tasks effortless.
How Is BMI Calculated?
The formula is your weight in kilograms divided by your height in metres squared. You do not need to do this by hand, because the tool does it for you.
Example: if you weigh 70 kg and are 1.75 m tall, then BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.06 = 22.9, which is in the healthy weight range.
BMI Categories
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5–24.9 | Healthy Weight |
| 25.0–29.9 | Overweight |
| 30.0 and above | Obesity |
BMI Cut-offs for Asian Adults
Health risks can begin at a lower BMI in many South and East Asian populations. Some Asian guidelines therefore use lower cut-offs. You can switch to these in the calculator above.
| BMI | Category (Asian cut-offs) |
|---|---|
| Below 18.5 | Underweight |
| 18.5–22.9 | Healthy Weight |
| 23.0–24.9 | Overweight |
| 25.0 and above | Obesity |
Ask your doctor which standard suits you best.
Why Check Your BMI?
BMI is a simple way to see whether your weight may be affecting your health. Staying in a healthy range can help lower the risk of conditions such as heart disease and type 2 diabetes. Use the Pro Tools Center BMI Calculator whenever you want to track your weight over time.
BMI Limitations
BMI may not accurately reflect body composition for:
- Athletes and others with high muscle mass
- Pregnant individuals
- Children and teenagers, who should use age- and sex-specific BMI charts
- Some older adults
BMI also does not show where fat is stored on the body. Consult a healthcare professional for a complete health assessment.
General Health Tips
- Eat a balanced diet.
- Stay physically active.
- Get enough sleep.
- Drink plenty of water.
- Schedule regular health checkups.
These are general wellness tips, not personalized medical advice.
While tracking your health and wellness goals, you can also check and format your text content instantly using our Free Character Counter & Text Analyzer.
Frequently Asked Questions
Is BMI accurate?
BMI is a useful screening tool, but it does not directly measure body fat or overall health.
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is generally considered healthy. Some Asian guidelines place the upper limit at 22.9.
Can athletes have a high BMI?
Yes. Muscle is denser than fat, so some athletes may have a high BMI even though their body composition is healthy.
Should children use this calculator?
No. Children and teenagers are usually assessed with BMI-for-age growth charts instead of adult BMI categories.
Why is there an option for Asian cut-offs?
Research suggests that many Asian populations carry more health risk at a lower BMI than other groups. For this reason, some guidelines use 23 as the start of the overweight range and 25 as the start of obesity.
This BMI calculator is for informational purposes only. It is not intended to diagnose, treat, or prevent any medical condition. BMI is only one indicator of health. If you have concerns about your weight or overall health, consult a qualified healthcare professional.
When organizing medical reports, health records, or fitness charts, you can easily combine your documents into a single file with our Free PDF Merger.
References and Further Reading
- World Health Organization (who.int) for international BMI classifications.
- Centers for Disease Control and Prevention (cdc.gov) for adult BMI information.
- Your doctor or local health authority for guidance that fits your age, sex and background.
Last reviewed: 2026. Health guidelines change, so confirm current advice with a healthcare professional.
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