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Ideal Weight Calculator

Estimate a healthy target weight range based on your height, sex, and body frame size. See results from four widely used ideal weight formulas displayed side by side for comparison.
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Ideal Weight Calculator - ToolPremier
Units
Sex
Frame Size

Frame size adjusts the recommended range ±10%

ToolPremier · Ideal Weight Calculator · Results are estimates for adults

How it works

Find your ideal weight in three steps

1. Enter your height and sex

Input your height in centimetres or feet and inches, and select your sex. These are the two primary inputs used across all standard ideal weight estimation formulas.

2. Select your body frame size

Choose small, medium, or large frame. Frame size accounts for natural skeletal variation, which affects what constitutes a healthy weight for a given height.

3. Compare formula results

The calculator returns estimates from four established formulas — Devine, Robinson, Miller, and Hamwi — displayed side by side so you see a realistic range rather than a single figure.

FAQ

Common questions

Several formulas have been developed to estimate a target weight based on height and sex. The most commonly cited include the Devine formula (1974), Robinson formula (1983), Miller formula (1983), and Hamwi formula (1964). These were originally developed for clinical use — primarily to guide medication dosing by body weight — and use height as the primary variable with a sex-based constant and a per-inch adjustment above a baseline height. Displaying all four simultaneously gives a weight range rather than a single potentially misleading figure.
The concept of an ideal weight is a clinical approximation rather than a precise biological target. Individual factors such as muscle mass, bone density, body composition, age, and ethnic background all affect what a healthy weight looks like for a given person. The formulas used in this calculator were developed for population screening and clinical dosing, not as personal fitness benchmarks. A weight that falls slightly outside the calculated range is not necessarily unhealthy. Use this output as a general reference point to inform rather than dictate your personal weight goals.
Frame size refers to the relative size of a person’s skeletal structure, typically estimated from wrist circumference relative to height. People with larger frames naturally carry more weight at the same height compared to those with smaller frames, even at equivalent levels of health and body composition. Without a frame size adjustment, ideal weight formulas may underestimate a healthy weight for large-framed individuals or overestimate it for those with smaller builds. This calculator applies a frame-based adjustment to shift the estimate range accordingly.
You can use it as a rough reference point, but setting weight targets based solely on formula-derived ideal weights has limitations. The output does not account for your current body composition, muscle mass, age-related changes, or underlying health conditions. A more practical approach is to set goals based on measurable health outcomes — blood pressure, blood glucose, energy levels, fitness performance — rather than a specific number on the scale. If you are managing a health condition, work with a doctor or registered dietitian to set a target that reflects your complete clinical picture.

Keep going

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About the Ideal Weight Calculator

The Ideal Weight Calculator provides a reference weight range based on height, sex, and body frame size, drawing on four established medical formulas used in clinical settings. It is used by individuals setting weight goals, healthcare providers conducting initial patient assessments, and fitness professionals designing programmes for clients. Showing multiple formula outputs simultaneously gives users a realistic range rather than an artificial single target.

Benefits

  • Displays results from four established formulas (Devine, Robinson, Miller, Hamwi) side by side
  • Accounts for body frame size to produce a more personalised weight range
  • Supports both metric and imperial height inputs
  • Runs entirely in your browser with no data stored, shared, or transmitted

Privacy

Your height, sex, and frame size are used solely for the in-browser calculation and are never transmitted to any external system.