Ideal Weight Calculator
Estimate your ideal body weight using the Devine formula and compare with the WHO healthy BMI reference range. Free in your browser.
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How to use Ideal Weight Calculator
- 1
Enter your height in centimeters.
- 2
Select your biological sex for formula calculation.
- 3
Click Calculate to view your Devine IBW and WHO normal BMI corridor.
Capabilities
- Calculates reference Ideal Body Weight (IBW) using the Devine formula
- Displays the full WHO healthy BMI range (18.5 to 24.9 kg/m²)
- Instant client-side calculation in your web browser
How Ideal Body Weight (IBW) & Healthy Weight Ranges Work
Ideal Body Weight (IBW) formulas provide standardized anthropometric benchmarks used in nutritional and medical research. Comparing formulaic estimates against the broader World Health Organization healthy BMI corridor offers a balanced perspective on healthy body weight.
There is no universally optimal weight for any individual. Natural variations in bone density, athletic muscularity, and body frame mean healthy weights span a range. These figures are educational references, not personal medical advice.
• Male: 50.0 kg + 2.3 kg per inch over 5 feet
• Female: 45.5 kg + 2.3 kg per inch over 5 feet.
Formula: 18.5 * [Height (m)]² to 24.9 * [Height (m)]². Reflects the broad statistical range associated with lower long-term lifestyle health risks.
Worked Example: Male at 175 cm (5 ft 9 in)
Inches Over 5 Feet: (175 / 2.54) - 60 = ~8.9 inches
Devine Ideal Body Weight (IBW): 50.0 + (2.3 * 8.9) = ~70.5 kg
Healthy BMI Range (18.5 – 24.9): 18.5*(1.75)² to 24.9*(1.75)² = 56.7 kg to 76.3 kg
To estimate body fat percentage rather than total scale weight, use Body Fat Calculator.
This tool operates in a sandbox directly inside your web browser. All parsing, processing, and downloads are rendered locally. Your file size, metadata, and contents never cross the network. It works completely offline.
Frequently Asked Questions
What is the Devine formula for Ideal Body Weight (IBW)?
Developed by Dr. B.J. Devine in 1974 for medical drug dosing, the formula establishes a baseline weight for a 5-foot individual (50 kg for males, 45.5 kg for females) and adds 2.3 kg for each additional inch of height.
Is there a single perfect ideal weight for every person?
No. Human bodies vary widely in skeletal frame size, bone density, muscularity, age, and genetics. Clinical practice recognizes healthy body weights as spanning a broad range rather than a single rigid number.
How does the healthy BMI range compare to the Devine IBW?
The WHO normal BMI range (18.5 to 24.9 kg/m²) provides a wide healthy weight corridor (often spanning 15 to 20 kg for a given height), within which the Devine formula typically sits near the middle.
Does the Devine formula account for athletic muscle mass?
No. Like BMI, the Devine formula relies exclusively on height and biological sex. It does not measure athletic muscle development or body fat distribution.
Can this tool be used for clinical medication dosing?
No. While originally designed for pharmacokinetic dosing calculations, this web tool is for educational reference only and should not be used to determine clinical pharmacotherapy.