BMI Calculator

BMI (Body Mass Index) is a simple screening tool that measures body fat based on height and weight. It helps identify if you're underweight, normal weight, overweight, or obese. While not perfect, BMI is widely used by healthcare professionals as a quick assessment of potential health risks related to weight.

According to WHO standards, a healthy BMI for adults is between 18.5 and 24.9. A BMI below 18.5 is considered underweight, 25-29.9 is overweight, and 30 or above is classified as obese. However, BMI should be considered alongside other factors like muscle mass, age, and overall health.

BMI is a useful general screening tool but has limitations. It may not accurately reflect body fat percentage in athletes with high muscle mass, elderly individuals, pregnant women, or growing children. It also doesn't account for bone density, muscle-to-fat ratio, or fat distribution.

For metric: BMI = weight (kg) ÷ height (m)². For imperial: BMI = (weight (lbs) ÷ height (inches)²) × 703. For example, if you're 170 cm (1.7 m) tall and weigh 70 kg: BMI = 70 ÷ (1.7 × 1.7) = 24.2.

BMI itself is a measurement tool, not a weight loss program. However, knowing your BMI can help you set realistic weight goals. If your BMI is above the healthy range, consult a healthcare professional or nutritionist to create a safe, personalized weight management plan.

Absolutely! This BMI calculator works entirely in your browser using JavaScript. Your height, weight, and BMI are never sent to our servers or stored anywhere. All calculations happen locally on your device for complete privacy.

If your BMI is below 18.5 or above 25, consider consulting a healthcare professional. They can provide personalized advice based on your complete health profile, not just BMI. Remember that BMI is just one indicator of health, and factors like diet quality, physical activity, and genetics also matter.