Ideal Weight Calculator
Find the weight interval corresponding to an adult BMI reference range—not a personal ideal.
Your estimate
Enter your values and calculate. Results will appear here.
“Ideal weight” is a common search term, but this tool intentionally returns a reference interval. It solves the BMI equation for weight and does not apply a separate clinical assessment.
How to use this calculator
Enter adult height in centimetres or feet and inches. Read the result as the weights corresponding to the stated BMI interval, not as a recommended goal weight. Use the BMI tool if you want to calculate the ratio for a particular weight.
Formula and methodology
Reference weight interval = 18.5 × height in metres² to below 25 × height in metres².
Worked example
For 1.75 m, height squared is 3.0625. The interval is 56.65625 kg to below 76.5625 kg, displayed as approximately 56.7 to below 76.6 kg. The displayed upper value is rounded; classification uses the unrounded boundary.
What the result means
“Ideal weight” is a common search term, but this tool intentionally returns a reference interval. It solves the BMI equation for weight and does not apply a separate clinical assessment.
Limitations
The adult screening interval does not describe individual fitness, muscle mass or health. It is not appropriate for children or pregnancy. A person’s circumstances may require interpretation beyond this height-only comparison.
Common mistakes
Do not choose the lowest number as a goal simply because it is within the interval. This calculator does not evaluate whether weight change would be beneficial.
Frequently asked questions
Why is there no single ideal weight?
Height alone cannot determine a personal ideal. An interval makes the limited BMI-based method explicit.
Is the upper endpoint included?
No. The referenced category stops below BMI 25. Rounding the displayed weight does not change that boundary.