Ideal Body Weight Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 27, 2026
Disclaimer: This calculator is provided for informational and educational purposes only and does not constitute financial, medical, legal, or other professional advice. Always consult a qualified professional before making decisions based on these results.
How the Devine formula works
- Start with a base weight of 50kg (male) or 45.5kg (female) at exactly 5 feet tall.
- Add 2.3kg for every inch of height above 5 feet.
- The result is a reference weight, not a mandatory target.
Worked example
For a male at 175cm tall (about 8.86 inches over 5 feet):
IBW = 50 + (2.3 x 8.86) = 70.5 kg
Frequently asked questions
Where did this formula come from? The Devine formula was developed in 1974 originally to help calculate medication dosages based on body weight, not as a fitness or aesthetic target - it has since become a common general reference point in clinical settings.
Should I aim for exactly this number? Not necessarily - healthy weight varies with frame size, muscle mass, and individual health circumstances. This figure is best used as one general reference point alongside other health measurements, not a strict goal.