Free BMI Calculator
Calculate Your Body Mass Index Online
Calculate your Body Mass Index (BMI) instantly with our free online calculator. This simple tool uses your height and weight to determine if you're at a healthy weight and helps track your weight status and potential health risks.
What is Body Mass Index (BMI)?
Body Mass Index (BMI) is a simple calculation that uses your height and weight to determine if you're at a healthy weight. Our BMI calculator provides an easy way to calculate your BMI and understand your weight status category.
The BMI formula divides your weight in kilograms by your height in meters squared (kg/m²). This free BMI calculator does the math automatically, giving you instant results to help assess your health status.
How to Calculate BMI
BMI Formula
BMI = weight (kg) ÷ height² (m²)
Or: BMI = (weight in pounds × 703) ÷ height² (inches²)
Our BMI calculator online uses this standard formula to give you accurate results.
Using Our Free BMI Calculator
- Enter your current weight (kg or lbs)
- Enter your height (cm, meters, or feet/inches)
- Click calculate to get your BMI instantly
- Review your BMI category and health insights
BMI Chart and Healthy Weight Ranges
Use this BMI chart to understand what your calculated BMI means for your health:
| BMI Range | Weight Status | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Potential health risks |
| 18.5 - 24.9 | Healthy Weight | Low risk |
| 25.0 - 29.9 | Overweight | Moderate risk |
| 30.0 and above | Obese | High risk |
BMI Calculator for Men and Women
BMI Calculator for Men
Men typically have more muscle mass, which can affect BMI interpretation. While our BMI calculator provides the same calculation for both genders, men may have a higher BMI due to muscle mass without being overweight.
BMI Calculator for Women
Women's BMI interpretation may vary during pregnancy, menstruation, and menopause. Our free BMI calculator provides standard calculations, but women should consider additional factors when evaluating their health status.
Understanding BMI Calculator Limitations
While our BMI calculator online is a useful health screening tool, it has limitations:
- BMI doesn't distinguish between muscle mass and fat mass
- May not be accurate for athletes with high muscle mass
- Age, gender, and ethnicity can affect BMI interpretation
- Doesn't measure body fat distribution or bone density
- Consult healthcare professionals for comprehensive health assessment
Frequently Asked Questions About BMI
What is a healthy BMI range?
A healthy BMI range is typically between 18.5 and 24.9. Use our free BMI calculator to determine where your BMI falls and whether you're in the healthy weight range.
How often should I use a BMI calculator?
You can use our BMI calculator whenever you want to track changes in your weight status. Many people check their BMI monthly or quarterly as part of their health monitoring routine.
Is this BMI calculator accurate?
Our BMI calculator online uses the standard BMI formula recognized by health organizations worldwide. The calculation is mathematically accurate, but BMI interpretation should consider individual factors.
Can I use this BMI calculator if I'm pregnant?
Pregnant women should consult their healthcare providers for appropriate weight monitoring. Standard BMI calculations may not apply during pregnancy, and specialized prenatal charts are recommended.