Calculate Body Mass Index with metric/imperial units and gender-specific healthy ranges.
Healthy Weight Range: -
Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared. This calculator provides gender-specific BMI assessments for more accurate health evaluations.
This calculator supports both metric (centimeters and kilograms) and imperial (feet/inches and pounds) units, with real-time results as you type. Select your gender to see personalized BMI categories and healthy weight ranges. Results update automatically, no need to click calculate repeatedly.
1. Select your unit system: Choose between Metric (kg/cm) or Imperial (lbs/ft) based on your preference. Results update automatically when you switch.
2. Select your gender: Choose Male or Female. BMI categories and healthy weight ranges differ slightly by gender for more accurate assessments.
3. Enter your height: Input your height in centimeters (metric) or feet and inches (imperial). The calculator updates in real-time.
4. Enter your weight: Input your weight in kilograms (metric) or pounds (imperial). Your BMI and health category appear instantly.
5. View your results: See your BMI value, weight category (Underweight, Normal, Overweight, Obese), and personalized healthy weight range based on your gender and height.
Normal BMI ranges differ by gender. For males, the healthy range is 18.5 to 24.9. For females, it's 18.0 to 23.9 due to physiological differences in body composition. This calculator automatically adjusts the ranges based on your selection.
Women typically have higher body fat percentages than men at the same BMI due to biological factors. As a result, some health organizations recommend slightly different BMI ranges for males and females for more accurate health assessments.
Metric: BMI = weight (kg) ÷ height (m)². For example, 70 kg ÷ (1.75 m)² = 22.86. Imperial: BMI = 703 × weight (lbs) ÷ height (in)². For example, 703 × 154 lbs ÷ (69 in)² = 22.76.
The healthy weight range depends on your height and gender. This calculator provides personalized ranges based on your inputs. For a 175cm male, the range is approximately 56.7-76.4 kg (125-168 lbs). For a female of the same height, it's about 55.1-73.2 kg (121-161 lbs).
While standard BMI categories apply to adults (18+), body composition changes with age. Older adults may have different ideal ranges. This calculator includes age for reference but uses standard adult categories. Consult healthcare providers for age-specific recommendations.
BMI is a general indicator and may not be accurate for everyone. It doesn't account for muscle mass, bone density, or body composition. Athletes with high muscle mass may have a high BMI despite being healthy. Always consult a healthcare professional for personalized advice.