Ideal Weight Calculator Guide: The Actual Height Preset and BMI Weights
This calculator shows a primary height-based preset plus two separate BMI comparison weights. They are different calculations. None is a measurement of your personal ideal weight, and the primary result is not the midpoint of the comparison band.
What the two inputs control
Enter height in centimetres and select the sex coefficient. The calculator uses those fields only. It does not use current weight, age, waist, frame size, body-fat percentage, pregnancy or medical history.
That is why it can produce the same number for people with very different circumstances. Use the result to understand the preset, not to infer that the missing characteristics have somehow been assessed.
Reproduce the primary height preset
The current site method converts centimetres to inches by dividing by 2.54. It then calculates inches above 60, with negative values replaced by zero. The primary estimate is 48 + 2.3 × additional inches for the male selection or 45.5 + 2.3 × additional inches for the female selection, in kilograms.
At 170 cm, height is about 66.929 inches, leaving about 6.929 additional inches. The female preset is 45.5 + 2.3 × 6.929 ≈ 61.4 kg; the male preset is approximately 63.9 kg. These constants describe this site's implementation. We do not present them as a personalised or newly validated medical formula.
Calculate the BMI comparison weights separately
Convert 170 cm to 1.70 m and square it: 2.89 m². The lower comparison is 18.5 × 2.89 = 53.465 kg. The upper displayed comparison uses 24.9 × 2.89 = 71.961 kg. The tool rounds these to 53.5 and 72.0 kg.
These are weights corresponding to selected BMI values, not individual lower and upper prescriptions. Standard BMI categories use thresholds; rounding a displayed weight can blur an exact boundary. The primary preset and this BMI band should therefore retain their separate labels.
Know the short-height limitation
Because the additional-inches value is clamped at zero, heights at or below 152.4 cm receive the same primary baseline: 48 kg or 45.5 kg depending on the selection. The BMI comparison weights still change with height. This is a limitation of the preset, not evidence that people below that height share one ideal weight.
If you want to screen an entered weight relative to height, use the BMI calculator. If you are choosing a personal goal, read the goal-review guide and obtain individual advice where needed.
Frequently asked questions
Is the primary number a BMI calculation?
No. It comes from the height preset described above. Only the two separately labelled comparison weights use the chosen BMI values.
Does the sex selection adjust the BMI comparison weights?
No. At a given height, this tool uses the same 18.5 and 24.9 multipliers for both selections; the primary preset coefficient differs.