What this tool helps you do
This calculator estimates ideal body weight using the Devine, Robinson, Miller, and Hamwi formulas.
It also shows the healthy BMI range for the same height and optionally compares the estimates with your current weight.
How it works
Method
Run four classic IBW equations
Each formula starts from a baseline at five feet and adds a sex-specific increment for every inch above that height.
Because the equations were developed in different clinical contexts, they produce a range rather than one universal truth.
Method
Show the BMI 18.5-25 range too
The calculator also converts BMI 18.5 and BMI 25 into a healthy-weight range for your height.
When current BMI is 30 or above, it also shows adjusted body weight as a clinical reference value.
Formula or method
Devine: male 50 + 2.3 × (inches − 60), female 45.5 + 2.3 × (inches − 60)
Robinson: male 52 + 1.9 × (inches − 60), female 49 + 1.7 × (inches − 60)
Miller: male 56.2 + 1.41 × (inches − 60), female 53.1 + 1.36 × (inches − 60)
Hamwi: male 48 + 2.7 × (inches − 60), female 45.5 + 2.2 × (inches − 60)
Example
At 70 inches, Robinson gives about 71.0 kg, Miller about 70.3 kg, Devine about 73.0 kg, and Hamwi about 75.0 kg.
At 70 inches, the BMI 18.5-25 range is about 58.5 to 79.0 kg.
Assumptions and limitations
IBW equations do not measure body composition or muscle mass.
The range is more informative than any single estimate on its own.
FAQ
They were developed in different settings and make different assumptions about what a reference weight should represent.
Not exactly. BMI range and IBW formulas are related reference systems, but they are not the same thing.
It appears when current BMI is 30 or higher because some clinical calculations use it instead of actual or ideal body weight alone.
Sources
Important notes
These tools provide educational estimates and do not replace nutrition counseling or medical advice.
If you have kidney disease, eating disorders, pregnancy, or complex medical conditions, confirm targets with a clinician.
Learn more about how Glone handles content quality in the editorial policy.
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