Health / Browser calculator

Ideal Weight Calculator

Ideal Weight Calculator works from the inputs you provide and returns reference lower weight (kg), reference upper boundary (kg, exclusive). Use the calculation panel to explore a scenario, then check the formula and limitations before applying the result.

Your inputs

Minimum: 1e-06 · Maximum: 300
Minimum: 20 · Maximum: 120

Your results

Enter your values and calculate to see the result.

This calculator is for informational purposes only and is not a substitute for professional medical advice.

Formula and calculation method

Adult reference interval uses BMI 18.5 to below 25: lower weight = 18.5 × height²; upper boundary = 25 × height², with height in meters.

A population screening interval, not an individual ideal or a target weight. Body composition, medical history and pregnancy may change interpretation.

How to use ideal weight calculator

  1. Set Measurement system by choosing the option that matches your calculation.
  2. Set Height (cm or inches). The example below uses 175.
  3. Set Age (years). The example below uses 30.
  4. Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.

Worked example

Example inputs
Measurement system
Metric (kg, cm)
Height (cm or inches)
175
Age (years)
30
Reference lower weight (kg)
56.65625
Reference upper boundary (kg, exclusive)
76.5625

Factors affecting your result

A population screening interval, not an individual ideal or a target weight. Body composition, medical history and pregnancy may change interpretation.

Changing measurement system changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.

Frequently asked questions

How does the ideal weight calculator work?

Adult reference interval uses BMI 18.5 to below 25: lower weight = 18.5 × height²; upper boundary = 25 × height², with height in meters.

What inputs does Ideal Weight Calculator need?

Enter measurement system, height (cm or inches), age (years). Choose values that correspond to the same situation and measurement convention.

How should I interpret the ideal weight calculator result?

A population screening interval, not an individual ideal or a target weight. Body composition, medical history and pregnancy may change interpretation.

Are my ideal weight calculator inputs uploaded?

No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.

Method reference

Maintained by Calculators.buzz Editorial Team. Implementation date: . No professional credentials or clinical review are claimed. Read our methodology policy.