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Ideal Weight Calculator

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Estimate your ideal body weight from height and sex using the Devine, Robinson, Miller, and Hamwi formulas, with a healthy BMI weight range — instant and in-browser.

4 Formulas
Instant
100% Client-Side
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1. Enter your details

Sex
Height unit

Informational only — not medical advice. Ideal-weight formulas are population estimates and don't account for muscle mass, frame size, or body composition. Talk to a healthcare professional for personalised guidance.

2. Your ideal weight range

Average ideal weight
70 kg
154.4 lb
Healthy BMI range (18.5–24.9)
56.7–76.3 kg
124.9–168.1 lb for your height (175 cm)
Devine
70.5 kg
155.3 lb
Robinson
68.9 kg
151.9 lb
Miller
68.7 kg
151.6 lb
Hamwi
72 kg
158.8 lb

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How to Use

  1. 1 Select your sex (the formulas use sex-specific coefficients)
  2. 2 Choose centimetres or feet-and-inches for height
  3. 3 Enter your height
  4. 4 Read your ideal weight from all four formulas at once
  5. 5 Compare it against the healthy BMI weight range for your height

Features

  • Devine, Robinson, Miller, and Hamwi formulas side by side
  • Averaged ideal weight for a single easy-to-read figure
  • Healthy BMI range (18.5–24.9) for your exact height
  • Results in both kilograms and pounds
  • Metric and imperial height input
  • Runs entirely in your browser — nothing is uploaded

Why it Matters

There is no single 'correct' ideal weight — different clinical formulas give slightly different answers, and none of them capture muscle mass or frame size. Seeing four respected formulas together, alongside the healthy BMI range, gives you a sensible target band rather than a misleading single number. It's a useful starting point for conversations about a healthy weight.

★★★★★

Use Cases

Health Check-In

Get a realistic target weight band for your height and sex

Fitness Planning

Set a sensible goal weight when building a training or diet plan

Medication Dosing Context

Understand how clinicians estimate ideal body weight (informational only)

Compare Formulas

See how Devine, Robinson, Miller, and Hamwi differ for your height

What this tool does

The Ideal Weight Calculator estimates your ideal body weight from height and sex using four classic clinical formulas — Devine, Robinson, Miller, and Hamwi — and shows the healthy weight range based on BMI for your height.

How it works

Each formula starts from a base weight at five feet of height and adds a set amount per inch above (or subtracts below) it, with different coefficients for men and women. The tool computes all four, averages them, and also derives the healthy BMI band (18.5–24.9) for your height. Everything is a pure calculation that runs fully offline.

Informational only — not medical advice

These formulas use only height and sex and don’t account for muscle mass, frame size, age, or body composition. The result is a rough guide, not a medical target. Consult a doctor or registered dietitian for advice tailored to your health before making significant changes to your weight.

Privacy

Everything runs locally in your browser. No values are uploaded, logged, or stored.

Frequently Asked Questions

Which ideal weight formula is most accurate?
None is definitively 'most accurate' — each was derived for a slightly different purpose. The Devine formula is the most widely used, especially in medicine for drug dosing. Robinson and Miller are refinements of Devine, and Hamwi is a quick clinical estimate. This is why the tool shows all four plus an average, so you get a range rather than a single misleading figure.
Do these formulas account for muscle or frame size?
No. Classic ideal-weight formulas use only height and sex, so a muscular athlete and a sedentary person of the same height get the same estimate. Treat the result as a rough guide and consider body composition, frame size, and a professional assessment for a fuller picture.
What is the healthy BMI weight range shown?
It's the weight range that corresponds to a Body Mass Index of 18.5 to 24.9 for your height — the band the WHO classifies as a healthy weight. It's calculated as 18.5 and 24.9 multiplied by your height in metres squared.
Is my data stored anywhere?
No. The calculation runs entirely in your browser. Nothing you enter is uploaded, logged, or stored — refreshing the page clears everything.
Is this medical advice?
No. This tool is for general information only and is not a substitute for professional medical advice. Talk to a doctor or registered dietitian for guidance tailored to your health, especially before making significant changes to your weight.
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Want to understand the math?

Browse all guides →
Ideal Body Weight Formulas
ideal weight

Ideal Body Weight Formulas: Devine, Robinson, Miller, Hamwi

What the classic ideal body weight formulas actually measure, how Devine, Robinson, Miller, and Hamwi differ, and why a healthy weight is a range, not a single number.

24 Jun 2026

5 min read

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