Because the formulas disagree by several kilograms, the useful output is the range rather than a single number. Treat it as a reference band and refine it with your frame size, activity level and how you feel, rather than chasing one formula's answer. The Devine result is the one most often used in medicine, while the BMI range is the most widely quoted for general health.
Calculator
Formula used
Devine (men) = 50 kg + 2.3 kg per inch over 5 ft · Devine (women) = 45.5 kg + 2.3 kg per inch over 5 ft
How to use the Ideal Weight Calculator
- Select your biological sex and units.
- Enter your height.
- Choose a frame size for the adjustment.
- Compare the formulas and the BMI range to pick a target.
About this tool
The Ideal Weight Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Setting a sensible target weight.
- Understanding why different charts disagree.
- Checking a weight goal against the BMI range.
- Discussing a healthy range with a clinician.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Which formula should I trust?
None of them individually. Devine is the clinical standard for drug dosing, while the BMI range is the most practical guide for general health.
Does frame size matter?
Yes. A large frame legitimately weighs more than a small frame at the same height, which is why the tool applies a ±10% adjustment.
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