Free BMI Calculator Online

Our BMI Calculator computes your Body Mass Index by dividing your weight (in kilograms) by the square of your height (in meters). You input your weight and height, and it instantly calculates your BMI value based on this standard formula.

Your BMI result indicates your body mass category: underweight (below 18.5), normal weight (18.5–24.9), overweight (25–29.9), or obese (30 and above). It’s a general indicator of health based on weight relative to height.

Yes, our BMI Calculator supports both metric (kilograms, meters) and imperial (pounds, feet/inches) units. Enter your measurements in either system, and it will automatically convert them to calculate your BMI accurately.

No, while our BMI Calculator uses the standard formula for adults, BMI interpretation differs for children and teens, where age and gender-specific percentiles are used. For adults, the categories are the same regardless of gender.

The BMI Calculator is mathematically accurate based on the inputs you provide. However, BMI is a general screening tool and doesn’t account for muscle mass, bone density, or other factors—consult a healthcare professional for a full assessment.