Ideal Weight Calculator
About the Ideal Weight Calculator
Estimate a healthy target body weight from your height and sex using two established clinical formulas — Devine and Robinson — shown side by side so you can compare them. Ideal body weight (IBW) formulas give a single reference figure; they are a starting point, not a strict goal. Body composition, frame size, and fitness all matter, so use the range as guidance rather than a rule.
This tool works in your browser: the files and text you use are processed on your device and are not uploaded.
How to use it
- Select male or female.
- Enter your height in centimetres.
- Compare the Devine and Robinson target weights.
Frequently asked questions
How are the Devine and Robinson figures calculated?
Both build on a base weight for the first 5 feet (152.4 cm) of height, then add a fixed amount per inch above that. Devine adds 2.3 kg/inch (base 50 kg men, 45.5 kg women); Robinson adds 1.9 kg/inch for men (base 52 kg) and 1.7 kg/inch for women (base 49 kg).
Which formula should I use?
Devine is the most widely used, especially for medication dosing, so it is shown as the standard target. Robinson tends to give slightly different values; seeing both gives you a sensible range rather than a single point.
Is ideal body weight the same as a healthy weight?
Not exactly. IBW formulas were originally designed for clinical dosing, not to define the one correct weight for a person. A healthy weight is better thought of as a range — cross-check with BMI and, ideally, professional advice.
What if I am shorter than 5 feet?
Below 152.4 cm the formulas fall back to their base weights (50/52 kg for men, 45.5/49 kg for women), since the per-inch component only applies above 5 feet. For very short statures, treat the number cautiously and consult a professional.
This tool provides general estimates for informational purposes only and is not medical advice. Always consult a qualified healthcare professional about your health, diet, or pregnancy.