⚖️ BMI Calculator
Check if your weight is healthy for your height
How it works
Calculate your Body Mass Index (BMI) instantly with our free online calculator. Enter your height and weight to find out if you're underweight, normal weight, overweight, or obese. Supports both metric (kg/cm) and imperial (lbs/ft) units. BMI is calculated using the formula: weight (kg) / height² (m). While BMI is a useful screening tool, it doesn't account for muscle mass, bone density, or body composition — consider using our Body Fat Calculator for a more complete picture.
Disclaimer: This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.
Frequently Asked Questions
- What is a healthy BMI range?
- A healthy BMI is between 18.5 and 24.9. Below 18.5 is considered underweight, 25-29.9 is overweight, and 30+ is classified as obese. However, BMI doesn't account for muscle mass, so athletes may have a high BMI while being perfectly healthy.
- Is BMI accurate for athletes?
- No. BMI doesn't distinguish between muscle and fat. A muscular person can have an 'overweight' BMI while having low body fat. If you exercise regularly, consider using our Body Fat Calculator for a more accurate assessment.
- How often should I check my BMI?
- Once a month is enough if you're tracking weight changes. BMI is a screening tool, not a day-to-day metric. Focus on trends over time rather than individual readings.
- Does BMI differ by age or sex?
- The formula is the same for all adults, but interpretation can vary. Older adults may have more body fat at the same BMI, and women typically carry more fat than men. For children and teens, BMI percentiles adjusted for age and sex are used instead.