Ideal weight calculator

There is no single ideal weight for everyone at your height. This tool shows the range corresponding to a standard adult BMI of 18.5 to below 25. For adults aged 20 and over, outside pregnancy.

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How the range is calculated

Lower boundary in kg = 18.5 × height in metres × height in metres
Upper boundary in kg = 25 × height in metres × height in metres

The upper boundary is excluded. At 1.70 m, the unrounded boundaries are 53.465 kg and 72.25 kg. The result rounds them for display, so a number close to a boundary needs the unrounded BMI calculation. This tool does not pick the middle of the range as a goal.

Why a range is more useful than one ideal number

CDC describes BMI as a screening measure that should be considered alongside other information. Height alone cannot account for muscle, medical history or where body fat is carried. A weight inside this range does not establish that someone is healthy, and a weight outside it is not a diagnosis.

Does the same range apply to everyone?

This page uses the standard adult band. Some population guidelines use lower action thresholds. Our BMI calculator includes the standard and Asian scales and explains the differences. Children and teenagers need age-specific assessment instead of this adult height-only calculation.

Sources

1. CDC. Adult BMI categories. The standard healthy weight category is 18.5 to less than 25 for adults aged 20 and over.

These calculators give estimates for adults, not a diagnosis. Nothing you type leaves this page.