BMI Categories
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | < 18.5 | Higher risk |
| Normal | 18.5 - 24.9 | Low risk |
| Overweight | 25 - 29.9 | Increased risk |
| Obese | 30+ | High risk |
How to Calculate Your BMI
BMI is your weight in kilograms divided by your height in metres squared, and this calculator does it in both measurement systems: switch to imperial and enter your height in feet and inches and your weight in pounds, or stay in metric with centimetres and kilograms. The number lands in one of four ranges - under 18.5, 18.5 to 24.9, 25 to 29.9, and 30 or above - and the gauge shows where you sit on that scale. Everything is calculated in your browser, so your height and weight never leave your device.
BMI is a population-level screening number, not a diagnosis: it cannot tell muscle from fat, and it does not account for age, bone density or pregnancy. If you want a second opinion on the same numbers, the body fat calculator estimates body composition, the calorie calculator turns your weight into a daily intake, and the baby percentile calculator does the same job for infants.
Why Use Our BMI Calculator?
- Metric & Imperial: Works with both measurement systems
- Instant Results: See your BMI as you type
- Visual Gauge: Easy-to-understand visual representation
- Health Categories: Know your risk level at a glance
- Mobile Friendly: Large touch targets, works on any device
- No Signup: 100% free, no ads, no account required
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a numerical value of your body weight in relation to your height. It's used to estimate whether you have a healthy body weight for your height.
Is BMI accurate for everyone?
BMI is a general indicator and doesn't account for muscle mass, bone density, age, or gender. Athletes may have a high BMI due to muscle, not fat. Consult a healthcare provider for personalized advice.
What's the healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.
Should I rely solely on BMI?
No, BMI is just one indicator of health. Other factors like blood pressure, cholesterol, blood sugar, and physical activity are also important. Always consult a healthcare professional for health advice.
Is this BMI calculator free?
Yes, completely free with no signup required. No ads, no upsells, just a clean BMI calculator.
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