Ideal Weight Calculator
Ideal body weight by formula plus the healthy BMI range for your height.
The Ideal Weight Calculator estimates a reference weight for your height using the classic Devine formula, with an optional adjustment for body frame, and shows the healthy BMI range (18.5–24.9) converted to kilograms — the range most medical guidance actually uses.
'Ideal weight' is an idea with a long medical history, but it was never designed to capture muscular athletes or individual builds. That is why this tool shows both numbers side by side: the formulaic single figure and the broader healthy range, letting you target whatever fits your body type and goals.
The healthy BMI range is the more robust target for most people. Whatever number you aim for, trends over time matter more than any single reading. The calculation runs entirely in your browser.
Devine formula
73.18 kg
≈ 161.34 lb
Healthy BMI range
58.62 – 78.89 kg
BMI 18.5–24.9
'Ideal weight' is a rough guideline — formulas ignore muscle mass and frame differences. The healthy BMI range is the more useful target for most people.
How to use the Ideal Weight Calculator
- Choose your sex.
- Enter your height in centimeters.
- Optionally select your body frame (small, medium, large).
- Read the formula-based ideal weight and the healthy BMI range.
- Treat the range as your primary planning target.
Frequently asked questions
What is the Devine formula?
For men: 50 kg + 2.3 kg per inch over 5 feet. For women: 45.5 kg + 2.3 kg per inch over 5 feet. It was developed for medication dosing and is often quoted as 'ideal weight', though it predates modern body-composition understanding.
Why does the healthy range matter more than one number?
Because healthy bodies come in many shapes: at 178 cm the healthy range spans about 59–79 kg. A single formula figure ignores muscle mass and frame; the range gives you legitimate room to land where you feel and perform best.
Does frame size change the numbers much?
Modestly — this tool adjusts ±10% for small or large frames, reflecting that wrist and bone structure create real differences in what is sustainable. If you are unsure of your frame, use the medium setting and the healthy range.
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