How to Use Ideal Weight Calculator
The Ideal Weight Calculator estimates a weight range considered optimal for your height, age, and sex, typically based on established formulas like BMI or various ideal body weight equations. It provides a numerical target to guide your health and wellness decisions.
What It Does
Use the calculator with intent
The Ideal Weight Calculator estimates a weight range considered optimal for your height, age, and sex, typically based on established formulas like BMI or various ideal body weight equations. It provides a numerical target to guide your health and wellness decisions.
This tool is perfect for individuals starting a weight loss or gain plan, those curious about their healthy weight range, or anyone seeking a baseline for fitness goals. It's especially useful for adults wanting to understand general health benchmarks, athletes monitoring their physique, or individuals discussing weight with their healthcare providers.
Interpreting Results
Do not read any one of the Devine, Robinson, or Miller figures as your target; read the gap between the lowest and highest as a healthy range. All four formulas were built for medication dosing and assume average build, so a muscular lifter should sit above the top of the range. Use it as orientation, then refine with body-fat percentage.
Input Steps
Field by field
- 1
Enter inputs
Enter height and sex. The output shows a range from multiple formula references (Hamwi, Devine, Robinson, Miller) — this range, not a single number, is the intended output.
- 2
These
These formulas were developed for medication dosing and anesthesia — they assume average body composition and consistently underestimate appropriate weight for people with above-average muscle mass.
- 3
Step 3
A person who resistance trains regularly will function optimally 10–20 lbs above what these formulas suggest. Frame the output as an orientation, not a personal target.
- 4
Adjust for context
If your weight significantly exceeds the range and you want to reduce, use the Body Fat Percentage Calculator and Calorie Deficit Calculator for actionable, composition-based targets instead.
- 5
Read outputs
The most clinically useful individual target for most people is a BMI of 21–24 adjusted for build and body composition — more meaningful than any formula output.
Compare the Devine, Robinson, Miller, and Hamwi outputs side by side; the spread between them is your realistic range, not any single value to chase.
Common Scenarios
Use realistic starting points
Baseline assumptions
Sex
male
Height Cm
178
Frame Size
medium
Start with devine kg and compare it with robinson kg before changing anything.
Same height, female
Sex
female
Height Cm
178
Frame Size
medium
At the same 178 cm, the female formulas land lower: Devine drops from about 73 kg to 69 kg, reflecting the lower base weight each equation assigns to women.
Shorter male
Sex
male
Height Cm
165
Frame Size
medium
Dropping height from 178 to 165 cm pulls the Devine target from about 73 kg down to 61 kg, since every formula adds weight per centimeter over a baseline.
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FAQ
Questions people ask next
The short answers readers usually want after the first pass.
What ideal weight formula does this calculator use?
Is "ideal weight" the same as "healthy weight"?
Can muscle mass affect my ideal weight calculation?
How accurate is this calculator for everyone?
Sources & References
- Body Mass Index: Considerations for Practitioners — National Center for Biotechnology Information (NCBI)
- Ideal Body Weight: A Critical Appraisal — National Center for Biotechnology Information (NCBI)