Ideal Weight Calculator

Your ideal body weight by height and gender

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Ideal Weight Calculator

Ideal body weight is an estimate of a healthy weight for your height. The Devine, Robinson and Hamwi formulas give slightly different figures, so a range is more realistic than a single number. The healthy BMI range (18.5–24.9) is a useful cross-check.

How to read your result

The three formulas usually land within a few kilograms of each other; treat the spread between them as a reference band, not a single target you must hit. The BMI-based range (18.5–24.9) is the broadest and most forgiving guide — any weight inside it is considered healthy for your height. Compare your current weight against that band and think in terms of direction, not one magic number.

How to use this ideal weight calculator

Select your gender, enter your height and press calculate — no sign-up needed. You can switch between metric (cm) and imperial (inches) units with one tap. The tool instantly returns three classic ideal-weight estimates — Devine, Robinson and Hamwi — in kilograms, plus the healthy weight range that corresponds to a BMI of 18.5–24.9 for your height.

The formulas and the science behind them

The Devine formula (1974) was created by Dr. B.J. Devine to standardize drug dosing and became the most cited ideal-weight equation in medicine. Robinson (1983) refined it against large height-weight datasets, while Hamwi (1964) began as a quick clinical rule for nutrition counselling. All three start from a base weight at 5 feet (152 cm) and add a fixed increment per extra inch of height.

Limits and practical tips

These equations ignore body composition, frame size, age and ethnicity — a muscular person can be perfectly healthy well above every formula value. They also lose accuracy below about 152 cm of height. Use the result as a rough compass, then check our BMI and body-fat calculators for a fuller picture, plan your intake with the protein calculator, and log your meals in the CaloNote app to make steady progress.

Frequently Asked Questions

What is an ideal weight calculator?
An ideal weight calculator estimates a target body weight from your height and gender using established clinical formulas. CaloNote shows results from the Devine, Robinson, and Hamwi equations alongside a healthy weight range based on a normal BMI.
Why do the Devine, Robinson, and Hamwi results differ?
Each formula was developed for a different purpose and uses slightly different weight-per-inch coefficients, so they produce a small spread of values. Viewing all three plus a BMI-based range gives you a realistic target band rather than a single rigid number.
Is ideal body weight the same as a healthy weight?
Not exactly. Ideal weight formulas give a population-based estimate and do not account for muscle mass or body composition. A healthy BMI range (18.5 to 24.9) is broader, so treat ideal weight as a reference point rather than a strict target.

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