Health & Wellness
Ideal Weight Calculator
See what four different published formulas say your ideal weight is, and why they disagree with each other.
Interactive tool
Ideal Weight Calculator
Formula range
65 to 67 kg
Healthy BMI range
53 to 66 kg
Formulas disagree by
1.5 kg
Choice IQ readout
The formulas disagree by several kilograms at the same height, which is the clearest evidence that no single ideal weight exists. The Devine formula, the one most widely quoted online, was originally derived for calculating drug dosages rather than health targets.
- Use the healthy BMI range for your height, on Indian cut-offs, as the more defensible reference.
- None of these formulas account for build, muscle mass or age, so all of them misread muscular and older people.
- For an individual target, ask a doctor who can see your build and history rather than picking the formula with the friendliest answer.
Tool guide
How to use this ideal weight calculator
There is no single ideal weight, and the honest way to show that is to run the four published formulas side by side and let them disagree. Devine, Robinson, Miller and Hamwi were each built for a different purpose - Devine originally for drug dosing, not health targets - and they typically differ by several kilograms at the same height. The useful output is the range, and the healthy-BMI range for your height is a more defensible reference than any of them.
Formula
Devine: men 50kg + 2.3kg per inch over 5ft; women 45.5kg + 2.3kg per inch. Robinson, Miller and Hamwi use the same structure with different constants. Healthy BMI range is calculated from the Asian-Indian cut-offs of 18.5 to 22.9.
Decision guide
When to use this ideal weight calculator
Best use case
Use this page when you need a quick first estimate before comparing products, lenders, subscriptions, or buying options. It is built for practical planning, not final professional advice.
Inputs needed
Keep these numbers ready: Sex, Height. If you are unsure, run one conservative estimate and one optimistic estimate.
Shareable result
After calculating, use the result link to save or share the same inputs. The URL parameters keep the calculation easy to revisit.
Common examples
Readers usually use this tool for comparing formulas that give different answers, sanity-checking a weight goal, understanding the range rather than a single number. The best way to read the output is to compare scenarios instead of treating one result as a final answer.
How it works
There is no single ideal weight, and the honest way to show that is to run the four published formulas side by side and let them disagree. Devine, Robinson, Miller and Hamwi were each built for a different purpose - Devine originally for drug dosing, not health targets - and they typically differ by several kilograms at the same height. The useful output is the range, and the healthy-BMI range for your height is a more defensible reference than any of them.
Examples
- Comparing formulas that give different answers
- Sanity-checking a weight goal
- Understanding the range rather than a single number
FAQ
Why do the formulas give different answers?
They were derived at different times from different populations for different purposes. The Devine formula was created for calculating drug dosages, not for setting health targets, and it is still the one most widely quoted online.
Which formula should I use?
None of them on its own. Use the spread as a range, and cross-check against the healthy BMI range for your height using Indian cut-offs. If you want an individual target, that is a conversation with a doctor who can see your build and history.
Does this account for muscle or body type?
No. Every formula here uses only height and sex, so a muscular person and a sedentary person of the same height get the same answer. That is the main reason to treat the output as a rough reference.
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