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Ideal Weight Calculator — Devine, Robinson, Miller & Hamwi

Devine + Robinson + Miller + Hamwi formulas, side by side, plus the healthy BMI weight band — metric and imperial — browser-only

  • Runs locally
  • Category Calculator
  • Best for Getting a realistic range before a purchase, plan, workout, or schedule decision.
ft
in
By formula
Devine (1974)
155.9 lb

Used by pharmacy software for drug dosing.

Robinson (1983)
152.3 lb

A later refit — usually the lowest result.

Miller (1983)
151.9 lb

Gentlest per-inch slope of the four.

Hamwi (1964)
159.4 lb

The original rule of thumb — usually the highest.

Consensus estimate
154.9 lb
Combined formula range: 151.9 lb – 159.4 lb

Mean of all four formulas — the single number most people quote.

Healthy BMI weight range
125.3 lb – 168.6 lb

The weights that put your BMI between 18.5 and 24.9 at this height.

Ideal-weight formulas are population averages from the 1960s–80s, fitted on adults 5 ft and taller. They ignore muscle, age, and body composition — treat the range as a rough target, not a goal weight.

What this tool does

Free online ideal body weight (IBW) calculator that runs the four classic clinical formulas at once: Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964). Enter your sex and height in metric (cm) or imperial (ft + in), optionally pick a body frame, and the tool returns each formula's estimate, a consensus average, the combined range across all four, and the weight band that keeps your BMI between 18.5 and 24.9 at that height. Seeing the formulas side by side matters: at 175 cm they spread roughly 4 kg apart, so a single "ideal weight" number from one calculator can be misleading. The frame setting applies the Hamwi small/large ten-percent correction the way the original paper defined it, while the other three formulas stay true to their published coefficients. This is the same Devine equation pharmacy software uses for renal drug dosing, so the math is auditable rather than a made-up blend. Everything runs in your browser — your height and sex are never uploaded — and the shareable URL lets a coach or training partner open the exact same result. These are population averages from decades-old studies and ignore muscle and body composition, so the page is honest about treating the output as a rough target, not a goal weight.

Tool details

Input
Numbers
The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output
Live result + Copy
The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy
Browser-side processing
The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share
Shareable URL state
Key settings are encoded in the URL so another person can reopen the same setup.
Performance budget
Initial JS <= 9 KB
No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit
Calculator · HR
Category and role tags drive related tools, internal links, and quick fit checks.

How to use

  1. 1. Input

    Paste or drop your content into the tool panel.

  2. 2. Process

    Click the button. All processing is local in your browser.

  3. 3. Copy / Download

    Copy the result or download to disk in one click.

How Ideal Weight Calculator fits into your work

Use it for fast estimates, comparisons, and planning numbers before you make the final call.

Calculation jobs

  • Getting a realistic range before a purchase, plan, workout, or schedule decision.
  • Comparing scenarios by changing one input at a time.
  • Turning rough assumptions into a number you can discuss.

Calculation checks

  • Double-check units, dates, rates, and rounding assumptions.
  • Treat health, finance, tax, and legal outputs as planning aids, not professional advice.
  • Save the inputs that produced an important result so you can reproduce it later.

Good next steps

These links move the current task into a more complete workflow.

  1. 1 BMI Calculator Body Mass Index calculator with WHO + Asian classifications — metric and imperial — browser-only Open
  2. 2 BMR Calculator BMR calculator — basal metabolic rate by Mifflin-St Jeor and Harris-Benedict (compared side-by-side). Open
  3. 3 Calorie Calculator Calorie calculator — daily calorie needs (BMR + TDEE), weight loss/gain targets, macro breakdown. Open

Real-world use cases

  • Sanity-check a goal weight before a cut or bulk

    Before committing to a diet or training block, run your height through all four formulas plus the BMI band to see a realistic target window instead of a single arbitrary number. If your goal sits below the Robinson result (usually the lowest), that is a useful flag to discuss with a coach rather than chase blindly.

  • Fill a clinical or insurance form that asks for ideal body weight

    Some intake forms, drug-dosing protocols, and insurance questionnaires specifically ask for "ideal body weight" using the Devine equation. Copy the Devine result directly — it is the formula those workflows expect — and keep the consensus average for your own context.

  • Give a client a defensible range instead of one number

    Personal trainers and dietitians can paste the shareable link so a client opens the exact same four-formula breakdown. Showing the spread (and the wider BMI band) sets expectations honestly and avoids the trap of one calculator's number feeling like a hard rule.

  • Compare ideal weight against your current BMI screening

    Run this tool, then open the BMI calculator with your current weight. If your BMI is already inside 18.5–24.9 but above the formula average, that usually just means the formulas are conservative for your build — not that something is wrong.

  • Plan family or teen guidance with the right caveats

    Parents often want a quick "healthy weight" reference. Use the BMI band as the primary answer for adults, and read the FAQ note that these adult formulas do not apply to children, who need age- and sex-specific percentiles instead.

Common pitfalls

  • Treating the consensus average as a precise goal weight. It is the mean of four 40–60-year-old formulas that only know your height and sex; the BMI band around it is the realistic target, not a single decimal.

  • Using an ideal-weight number for an athlete or lifter. Height-only formulas cannot see muscle, so they label lean, heavily-trained bodies as "overweight." Use a body-fat or lean-mass estimate instead.

  • Applying adult formulas to children or teenagers. None of Devine, Robinson, Miller, or Hamwi are valid below adulthood; kids need age- and sex-specific BMI percentiles (CDC growth charts).

Privacy

Height, sex, and frame stay in your browser while the four formulas and the BMI band are computed. Toolora does not require an account for this tool and does not upload your inputs. The shareable link encodes height and sex in the URL only if you copy and send it yourself.

FAQ

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Made by Toolora · 100% client-side · Updated 2026-06-13