BMI Calculator – Body Mass Index for Adults
Calculate Body Mass Index from height and weight. Shows BMI category, healthy weight range, and what your result means for your health.
💪 Health📐 BMI = 703 × weight(lbs) / height(inches)²
Height (feet)
Height (inches)
Weight (pounds)
Please enter valid values.
Formula & Reference
| Variable | Formula | Units |
|---|---|---|
| BMI Calculator – Body Mass Index for Adults | BMI = 703 × weight(lbs) / height(inches)² | kg/m² |
Step-by-Step Examples
Example 1
5ft 10in, 175 lbs
BMI?
- 703 × 175 / 70² = 25.1
- Category: Overweight | Healthy: 129-173 lbs
✓ BMI 25.1
Example 2
5ft 5in, 130 lbs
BMI?
- 703 × 130 / 65² = 21.6 | Normal weight
✓ BMI 21.6
Example 3
6ft 0in, 220 lbs
BMI?
- 703 × 220 / 72² = 29.8 | Overweight
✓ BMI 29.8
Real-World Applications
Adults
Calculate BMI and healthy weight range.
Healthcare
Quick BMI screening tool.
Fitness
Track progress toward healthy weight.
Insurance
BMI is used in health risk assessments.
Common Mistakes to Avoid
⚠️
BMI is a screening tool only
Athletes with high muscle mass often have high BMI but healthy body fat. BMI alone is not a diagnosis.
⚠️
Different standards by ethnicity
Asian populations may face health risks at lower BMIs. Some guidelines use 23 as overweight for Asian adults.
Frequently Asked Questions
Healthy BMI range? ▾
18.5-24.9 for most adults. Below 18.5 = underweight. 25-29.9 = overweight. 30+ = obese.
BMI for children? ▾
Children use age- and sex-specific percentile charts — not fixed cutoffs like adults.
Is BMI accurate? ▾
A population screening tool, not an individual diagnostic. Waist circumference and body fat % are more precise for individuals.