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Metric BMI formula
Divide weight in kilograms by height in meters squared.
BMI = weight(kg) ÷ height(m)²
Worked example
At 68 kg and 1.65 m, BMI = 68 ÷ 1.65² ≈ 24.98.
Convert centimeters to meters first
If height is given in centimeters, divide by 100 before squaring the height.
Common mistakes
- Using centimeters directly in the denominator.
- Forgetting to square height.
- Rounding height too aggressively before calculating.
Frequently asked questions
Can I use centimeters in the formula?
Convert centimeters to meters first.
Does the metric formula need 703?
No. The 703 factor is only for pounds and inches.
Is a BMI calculator faster?
Yes, especially when converting units or comparing multiple values.