BMI Calculators for Adults
BMI Calculator: Check Your Body Mass Index Now
Find out if you’re in the healthy range with our accurate BMI calculator (kg/cm or lbs/ft). Get instant results with WHO-standard categories.
Calculate Your BMI NowHow to Calculate BMI Manually
Formula: BMI = weight (kg) ÷ (height (m) × height (m))
Example: For 70kg and 175cm (1.75m):
70 ÷ (1.75 × 1.75) = 22.9 (Healthy range)
Or use our calculator below for instant results!
BMI Calculator
Enter your details to calculate your Body Mass Index
Your BMI Result
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BMI Calculator FAQs
- Under 18.5: Underweight
- 18.5-24.9: Normal weight
- 25-29.9: Overweight
- 30 and above: Obese
BMI Categories for Adults (CDC Standard)
| BMI Range | Weight Status | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | High nutritional risk |
| 18.5 – 24.9 | Healthy Weight | Lowest risk |
| 25.0 – 29.9 | Overweight | Increased risk |
| 30.0 and Above | Obesity | High risk |
WHO vs CDC BMI Standards Comparison
| BMI Range | CDC Classification | WHO Classification |
|---|---|---|
| < 16.0 | – | Severe Thinness |
| 16.0 – 16.9 | – | Moderate Thinness |
| 17.0 – 18.4 | Underweight | Mild Thinness |
| 18.5 – 24.9 | Healthy Weight | Normal Range |
| 25.0 – 29.9 | Overweight | Pre-obese |
| ≥ 30.0 | Obesity | Obese |
Note: WHO provides more granular underweight categories. WHO Guidelines
⚠️ Disclaimer: BMI is a screening tool only. It doesn’t measure body fat directly. Consult a healthcare provider for personalized assessment.
NIH BMI Classification
| BMI | Weight Status |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal Weight |
| 25.0 – 29.9 | Overweight |
| 30.0+ | Obesity |
Source: NIH
BMI Standards: WHO vs. CDC vs. NIH
| BMI Range | WHO | CDC | NIH |
|---|---|---|---|
| < 16.0 | Severe Thinness | Underweight | Underweight |
| 16.0 – 18.4 | Moderate Thinness | Underweight | Underweight |
| 18.5 – 24.9 | Normal | Healthy Weight | Normal Weight |
| 25.0 – 29.9 | Overweight | Overweight | Overweight |
| 30.0 – 34.9 | Obesity I | Obesity | Obesity |
| 35.0 – 39.9 | Obesity II | Severe Obesity | Severe Obesity |
| ≥ 40.0 | Obesity III | Morbid Obesity | Morbid Obesity |
“If you don’t find the desired unit, go to a unit converter, search for the measurement, and try again. Thank you.”
BMI Calculator – Calculate Your Body Mass Index Accurately
What Is a BMI Calculator?
A BMI calculator is a simple yet powerful tool that helps you determine your Body Mass Index (BMI), a measurement that assesses whether your weight is healthy for your height. Whether you’re tracking fitness progress, managing weight goals, or monitoring health risks, our BMI calculator provides instant results based on World Health Organization (WHO) standards.
Why Calculate BMI?
Your BMI is a useful indicator of whether you fall into a healthy weight range. Doctors and health professionals use BMI to screen for potential weight-related health risks, including:
Underweight (BMI < 18.5) – May indicate malnutrition or other health concerns
Normal weight (BMI 18.5–24.9) – Ideal range for most adults
Overweight (BMI 25–29.9) – Increased risk of developing weight-related conditions
Obese (BMI ≥ 30) – Higher risk of heart disease, diabetes, and other health issues
By using our BMI calculator, you can quickly calculate BMI and understand where you stand on the health spectrum.
BMI Categories Explained
| BMI Range | Category | Health Risk |
|---|---|---|
| < 18.5 | Underweight | Possible malnutrition |
| 18.5–24.9 | Normal (Healthy) | Low risk |
| 25–29.9 | Overweight | Moderate risk |
| ≥ 30 | Obese | High risk |
How to Calculate BMI ?
Calculating your BMI is simple with our tool. Just follow these steps:
Select Your Preferred Units – Choose between kilograms (kg) & centimeters (cm), pounds (lbs) & inches (in), or other available options.
Enter Your Weight and Height – Input your current weight and height.
Click “Calculate BMI” – Our BMI calculator instantly computes your result.
Check Your BMI Category – See whether you’re underweight, normal weight, overweight, or obese.
Our BMI calculator also includes a visual gauge, making it easy to see where your BMI falls on the WHO scale.
Who Should Use This BMI Calculator?
Our BMI calculator is perfect for:
✅ Adults – Check if your weight is within a healthy range.
✅ Athletes & Fitness Enthusiasts – Monitor weight changes and fitness progress.
✅ Doctors & Nutritionists – Quickly assess patient health metrics.
✅ Anyone Focused on Health – Stay informed about your body composition.
Is BMI Accurate for Everyone?
While BMI is a useful screening tool, it doesn’t account for muscle mass, bone density, or fat distribution. Athletes with high muscle mass may have a higher BMI without being overweight. Similarly, older adults may have lower muscle mass, affecting results. For a complete health assessment, consult a healthcare provider.
Benefits of Our BMI Calculator
✔ Multiple Unit Options – Works with kg, lbs, cm, ft, in, and stone.
✔ WHO-Compliant Results – Uses official BMI classifications.
✔ Visual BMI Gauge – See your result on a color-coded scale.
✔ Mobile & Desktop Friendly – Works perfectly on phones, tablets, and computers.
✔ No Sign-Up – Free and easy to use.
Start Calculating Your BMI Today!
Whether you’re on a weight loss journey, maintaining fitness, or just curious about your health, our BMI calculator provides quick, accurate results. Calculate BMI now and take the first step toward better health awareness!
Maintaining a healthy weight is essential for overall well-being, and BMI is a helpful tool to assess if you’re on track. By calculating your Body Mass Index, you gain insight into potential health risks linked to weight. Whether you aim to lose, gain, or maintain weight, knowing your BMI helps set realistic goals. However, remember that BMI is a general guide—it doesn’t account for muscle mass or body composition. For a complete health picture, pair BMI with other metrics like waist circumference and body fat percentage. Stay proactive about your health by using tools like our BMI calculator to make informed decisions.
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Need quick, accurate calculations without any data collection? Our 100% private online calculators give instant results—no signups, no tracking, just reliable tools at your fingertips.
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Bookmark this page for fast access to all your calculation needs—completely free and privacy-safe!
Frequently Asked Questions
What is BMI?
BMI stands for Body Mass Index. It is a simple measurement comparing weight and height to help determine a healthy body range.
How is BMI calculated?
BMI is calculated by dividing weight in kilograms by height in meters squared (kg/m²). Example: 70kg ÷ (1.75m × 1.75m) = 22.86.
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered healthy for most adults. Values outside this range may suggest underweight or overweight conditions.
Is BMI accurate for everyone?
BMI may not be accurate for athletes, pregnant women, children, or older adults due to variations in muscle, fat, and bone mass.
What are the limitations of BMI?
BMI does not directly measure body fat or health status. It can misclassify muscular people as overweight and older adults as healthy when they may have lost muscle mass.
Can children use this BMI calculator?
This calculator is intended for adults. Children and teens require age- and sex-specific growth charts for accurate BMI assessment.