Ideal Weight Calculator
Estimate a healthy target weight for your height using several established formulas.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
This tool provides general educational estimates only and is not medical advice. It does not diagnose, treat, or replace guidance from a qualified healthcare provider. Consult a doctor for decisions about your health.
About the Ideal Weight Calculator
The ideal weight calculator gives three classic estimates of a healthy body weight for your height and sex: the Devine, Robinson and Hamwi formulas. Each starts from a base weight at five feet tall and adds a fixed amount for every inch above that. They were originally developed for estimating medication doses and are still used in clinical settings, but they do not account for muscle mass, frame size or age. Seeing all three side by side shows that there is no single ideal number — a range is more realistic. For a broader picture, compare the results with the healthy BMI range for your height.
How to use it
- 1Choose metric or imperial units.
- 2Select your sex.
- 3Enter your height.
- 4Press Calculate to compare the Devine, Robinson and Hamwi estimates.
Worked example
for a man 175 cm tall (about 68.9 inches, or 8.9 inches over five feet) the Devine formula gives 50 + 2.3 × 8.9 ≈ 70.5 kg, Robinson gives about 68.9 kg and Hamwi gives about 72.0 kg. The healthy BMI range for the same height is 56.7–76.3 kg.
How it works
Formulas
The Devine, Robinson, and Hamwi formulas each add a per-inch amount above 5 feet to a base weight that depends on sex.
Who it is for
Adults setting a realistic weight goal and students learning how clinical weight formulas work.
Why it helps
Comparing several formulas gives a sensible target range instead of a single, overly precise number.
Common use cases
- Setting a weight-loss or weight-gain target
- Comparing formula estimates with your BMI range
- Understanding the formulas used for some medication dosing
Common mistakes to avoid
- Treating one formula’s result as the only acceptable weight.
- Applying the formulas to muscular athletes, whose healthy weight is often higher.
Frequently asked questions
A:They are all approximations. Ranges matter more than a single number; use them as a rough guide.
A:Yes — frame size and muscle mass affect a healthy weight, which these formulas do not capture.
Reviewed for accuracy · Last updated October 7, 2026
Formulas follow recognised clinical references — including WHO BMI classifications, the Mifflin-St Jeor equation, and Naegele’s rule — and are periodically checked against published reference values.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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