BMI Calculator
Body Mass Index (BMI) is a widely used measure to estimate body fat based on height and weight. It’s a simple way to assess whether you are underweight, normal weight, overweight, or obese. Our easy-to-use BMI Calculator helps you determine your BMI instantly and gives clear health guidance based on your results.
How to Use the BMI Calculator
Using this BMI calculator is fast and simple:
- Enter your height in centimeters (cm) in the first input field.
- Enter your weight in kilograms (kg) in the second field.
- Click “Calculate BMI”.
- Your BMI and category (e.g., Normal weight, Overweight) will be displayed instantly.
- You can also copy your result with one click using the “Copy” button.
- Click “Reset” to clear the form and start again.
This tool works smoothly across desktop and mobile devices and provides real-time results.
Example Calculation
Let’s say your height is 170 cm and your weight is 70 kg.
- Step 1: Convert height to meters: 170 cm = 1.70 m
- Step 2: Apply the formula: BMI=701.72=702.89≈24.2BMI = \frac{70}{1.7^2} = \frac{70}{2.89} ≈ 24.2BMI=1.7270=2.8970≈24.2
- Result: Your BMI is 24.2, which falls under the Normal weight category.
Benefits of Using This BMI Calculator
- ✅ Instant results without needing to sign up
- ✅ Clear BMI category classification (underweight, normal, overweight, obesity)
- ✅ Mobile-responsive and easy to use on any device
- ✅ One-click copy feature to save your BMI value
- ✅ Accessible interface for users of all ages
Use Cases
- 🧍 Individuals tracking fitness or managing weight goals
- 🩺 Health professionals needing a quick reference for patients
- 🏫 Schools or educators teaching students about health metrics
- 🧘♂️ Fitness coaches or nutritionists helping clients stay on track
- 🖥️ Website owners embedding this tool to enhance health-related content
Tips for Accurate Results
- Measure your height without shoes for accuracy.
- Weigh yourself in the morning, after using the restroom and before eating.
- Use consistent units (cm and kg) as required.
- Understand that BMI is a general guideline, not a diagnostic tool.
BMI Categories (WHO Standard)
| Category | BMI Range |
|---|---|
| Underweight | Less than 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25 – 29.9 |
| Obesity | 30 or greater |
Frequently Asked Questions (FAQs)
1. What is BMI?
BMI (Body Mass Index) is a number derived from your height and weight that helps assess your body fat and health risk.
2. How is BMI calculated?
BMI = weight (kg) ÷ [height (m)]²
3. Is BMI accurate for everyone?
BMI is a general guideline. It may not accurately reflect health for athletes, pregnant women, or older adults with low muscle mass.
4. What is a healthy BMI range?
According to WHO, a healthy BMI ranges from 18.5 to 24.9.
5. Can I use pounds and inches?
This tool currently uses metric units. Use a conversion tool if you have imperial values.
6. What happens if my BMI is too high or low?
A high BMI (over 30) may indicate obesity, while a low BMI (under 18.5) may indicate underweight. Consult a doctor for personalized advice.
7. Is this BMI calculator free to use?
Yes, it’s completely free and available to use anytime.
8. Does the calculator store any data?
No, all calculations are done in your browser. Nothing is saved or shared.
9. Can I copy my BMI result?
Yes! Use the “Copy” button to save your result easily.
10. How often should I check my BMI?
Checking monthly or during any significant weight change is a good practice.
11. Can I embed this on my own website?
Yes! If you own the code, feel free to embed it on your health or wellness site.
12. Is BMI suitable for children?
BMI for children uses different percentile-based charts. This calculator is for adults.
13. Does muscle affect BMI?
Yes. Muscular individuals may have higher BMIs without being overweight.
14. Why isn’t my result showing?
Ensure you’ve entered both height and weight correctly and clicked “Calculate.”
15. Can I use this on mobile?
Absolutely. The tool is mobile-friendly and responsive.
16. What if I enter invalid input?
The calculator will alert you to enter valid positive numbers for both fields.
17. Why is my BMI in decimal?
BMI is usually shown with one decimal place for precision.
18. Does BMI change with age?
The formula doesn’t change, but how BMI is interpreted might, especially in elderly individuals.
19. Can I use this for pregnancy tracking?
BMI is not an accurate tool for pregnant women. Consult a healthcare provider.
20. Where can I find other health calculators?
Check the rest of our website for tools like BMR, body fat percentage, and calorie calculators.