BMI Calculator
Check your Body Mass Index (BMI) to understand your health status.
Enter your height and weight to see your BMI.
About BMI Calculator
Calculate your Body Mass Index (BMI) instantly with our free online calculator. BMI is a widely used health metric that helps assess whether you're at a healthy weight for your height. Our calculator supports both metric (kg/cm) and imperial (lbs/inches) units, providing instant results with health category classification.
Whether you're monitoring your health, setting fitness goals, or tracking weight management progress, our BMI calculator provides quick, accurate results. All calculations happen locally in your browser - no personal data is stored or transmitted.
What is BMI?
Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. It's calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). While BMI is a useful screening tool, it should be used alongside other health assessments for a complete picture of your overall wellness and fitness level.
BMI Categories
- Underweight: < 18.5
- Normal weight: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obesity: 30 or greater
Key Features
- Dual Units: Supports both metric and imperial measurements.
- Instant Results: Calculate BMI in real-time.
- Health Categories: Automatic classification based on WHO standards.
- 100% Private: No data stored or transmitted.
- Free & Unlimited: Calculate BMI as many times as needed.
Frequently Asked Questions
Is BMI an accurate measure of health?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes may have high BMI despite being healthy. It's best used alongside other health indicators.
What BMI is considered healthy?
A BMI between 18.5 and 24.9 is generally considered healthy for adults. However, ideal BMI can vary based on age, sex, muscle mass, and ethnicity. Consult a healthcare provider for personalized advice.
Does age affect BMI?
Yes, BMI interpretation can vary with age. Older adults may have a slightly higher healthy BMI range. Children and teens use age and sex-specific BMI percentiles rather than adult categories.
Can I use BMI if I'm very muscular?
BMI may not be accurate for very muscular individuals, as muscle weighs more than fat. Athletes and bodybuilders may have high BMI despite low body fat. Consider body composition analysis for a more complete picture.