How Much Should I Weigh for My Height? The Answer
Automated technical check: . Scope and review policy
Height alone cannot determine how much an individual should weigh. DigiCalc's Ideal Weight Calculator compares four height-based reference equations, and its average is just an arithmetic average. It is not a medically established goal weight.
Compare what the formulas output
The implemented equations add a fixed increment for each inch above five feet. They do not assess muscle, body composition, age, symptoms or health history. Different starting values and increments explain why they disagree.
| Equation | Implemented calculation, kg | Output |
|---|---|---|
| Hamwi | 48 + 2.7 x 10 | 75.0 kg |
| Devine | 50 + 2.3 x 10 | 73.0 kg |
| Robinson | 52 + 1.9 x 10 | 71.0 kg |
| Miller | 56.2 + 1.41 x 10 | 70.3 kg |
The mean is 72.3 kg; the minimum and maximum across those outputs are 70.3 and 75.0 kg. This spread is not a confidence interval and does not show that every weight inside it is suitable, or every weight outside it is unsuitable.
Below five feet is a model boundary
These implemented equations use increments above a 60-inch baseline. The tool now returns no formula estimate below that baseline instead of treating all shorter heights as exactly five feet. Supported heights are 60-96 inches, a software range rather than a clinical suitability criterion. Choosing centimeters or feet and inches changes units, not the equation.
A BMI reference answers a different question
For the CDC adult category 18.5 to below 25, multiplying those boundaries by height in meters squared gives a height-based screening interval. At 170 cm, the lower boundary is 18.5 x 1.7 squared = 53.465 kg; the upper boundary is below 25 x 1.7 squared = 72.25 kg. These are mathematical category boundaries, not prescribed personal limits. Rounding a boundary can obscure whether it is inclusive.
The BMI Calculator shows a screening category from height and weight. It does not distinguish muscle from fat, set a pregnancy target, or provide pediatric percentiles. A circumference estimate adds different assumptions but still cannot make a diagnosis.
Do not turn an average into a diet goal
Neither the lowest output nor the mean establishes what is right for your body. These calculators do not recommend weight loss or gain, medication dosing, calorie restriction, or a nutrition plan. For decisions about weight and health, use an individual assessment rather than choosing whichever formula gives the desired number.
Sources and Scope
Technical example checks are not independent professional review. Sources were checked for the statements above on October 6, 2026.