There is no single "ideal" weight, which is why this calculator shows four established formulas side by side plus the healthy BMI range for your height. Seeing the spread between them is the point: the answer is a range, not a target number.
They were derived from different populations for different purposes — several originated in drug dosing rather than health guidance. A ten-kilogram spread between methods is normal and tells you the concept is inherently approximate.
The healthy BMI range is the one most widely used in modern clinical practice, because it gives a range rather than pretending to a single correct weight.
Yes, meaningfully. Someone with a broad frame carries more healthy weight than someone slight of the same height, and none of these formulas measure that.
No. Being underweight carries its own risks, including reduced bone density and impaired immune function. Health outcomes are best across a band, not at the bottom of it.
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