- Devine estimate
- 70.46 kg
- Robinson estimate
- 68.91 kg
- Miller estimate
- 68.75 kg
- Hamwi estimate
- 72.3 kg
How it works
An average cannot validate the equations
Averaging Devine, Robinson, Miller and Hamwi produces another arithmetic summary, not a more accurate personal goal. Their disagreement is useful evidence of model dependence, so retain the equation names when comparing outputs.
Reading reference weight equations without a personal target
Reference weight equations summarize relationships between measurements under specific models. Their outputs can differ and should not be treated as one uniquely correct weight for an individual. The child and teen mode uses a different age-related framework from the adult reference equations. Review the selected method and limitations before comparing a result with a current weight or a health goal.
Reference weight equations: formula and assumptions
Devine: 50 kg (male) or 45.5 kg (female), plus 2.3 kg per inch over 5 feet.
Historical reference-weight equations are not personal goals. They do not incorporate muscle, age, pregnancy, or clinical needs.
Child & teen BMI-for-age: formula and assumptions
BMI=kg/m². CDC LMS z=[(BMI/M)^L−1]/(L×S). Above P95, extended percentile=90+10×Φ[(BMI−P95)/sigma].
Uses the sex-specific CDC 2000 reference with the 2022 extension above the 95th percentile. Completed age in months selects the corresponding half-month row. Ages 2 to under 20 only. Percentiles are screening references, not diagnoses or weight-loss targets.
Worked example
Using the Reference weight equations example:
- Sex used by the equation
- Male
- Measurement system
- Metric (kg, cm)
- Height (cm)
- 175
Devine: 50 kg (male) or 45.5 kg (female), plus 2.3 kg per inch over 5 feet.
Example result
Devine estimate: 70.46 kg
Robinson estimate: 68.91 kg
Miller estimate: 68.75 kg
Hamwi estimate: 72.3 kg
These are illustrative inputs. Change the values to explore a different scenario.
What to keep in mind
Devine, Robinson, Miller, and Hamwi estimates are displayed for comparison, not as a prescription.
Formula references
- CDC: interpreting adult BMI (opens in a new tab)
- CDC: BMI-for-age LMS and 2022 extended growth-chart data (opens in a new tab)
References explain the underlying methods; they do not imply endorsement or individual professional review of Finflo.
Common questions
Why do the adult reference equations give different weights?
Devine, Robinson, Miller and Hamwi use different historical coefficients. They do not fully account for body composition or individual clinical needs.
Does the child mode prescribe an ideal weight?
No. It shows age- and sex-specific BMI reference information, not a weight-loss target or diagnosis.
Prepared by Finflo. See our methodology and editorial policy. Read the relevant professional-advice limitations.