Question 1

Which ideal weight formula is most accurate?

Accepted Answer

There is no single best formula, but Devine and Robinson are widely used in medical contexts. Results vary slightly because each formula is based on different assumptions about body composition.

Question 2

Why do different formulas produce different results?

Accepted Answer

Each formula is based on different assumptions about body composition and frame size. This is why comparing multiple methods provides a more complete picture of healthy weight ranges.

Question 3

Is BMI the same as ideal weight?

Accepted Answer

No. BMI provides a healthy weight range, while IBW formulas give specific target weights. The BMI range (18.5–24.9) offers a broader perspective on healthy weights.

Question 4

Does frame size affect ideal weight?

Accepted Answer

Yes. People with larger frames may have higher ideal weights, while smaller frames may have lower recommendations. This calculator lets you adjust by ±10% for frame size.

Ideal Weight Calculator