Ideal Weight Calculator
Find your ideal body weight range using four evidence-based methods.
What is Ideal Body Weight?
Ideal body weight (IBW) is an estimate of the weight associated with the lowest health risks for a given height. Multiple formulas exist, developed by different researchers over decades. This calculator shows results from three widely used formulas — Devine, Robinson, and Miller — giving you a useful range rather than a single number.
No single formula is perfect for everyone. Body frame size, muscle mass, age, and ethnicity all affect what a healthy weight looks like for you individually.
BMI-Based Healthy Weight Range
The WHO defines a healthy BMI as 18.5 – 24.9. The healthy BMI range shown above is the weight range that puts you within this BMI window for your height — offering a complementary perspective alongside the formula-based estimates.
Frequently Asked Questions
Which ideal weight formula is most accurate?
All three formulas (Devine, Robinson, Miller) were developed in clinical settings and typically agree within a few kilograms. The healthy BMI range (18.5–24.9) is another useful benchmark. No single formula suits everyone perfectly.
Can I be healthy outside the ideal weight range?
Yes. These formulas are population-based averages. Athletes with high muscle mass, people with different body frames, and older adults may be perfectly healthy outside these ranges. Consult a healthcare professional for personalised guidance.
What if I am under 5 feet (152 cm) tall?
The Devine, Robinson, and Miller formulas were developed for heights above 5 ft. For shorter individuals, the BMI-based healthy weight range is a more reliable estimate.
How is ideal weight different from BMI?
BMI is calculated from your current weight and height. Ideal weight formulas estimate what you should weigh based on height alone. They are complementary — use both for a fuller picture.
Formulas Used
Devine (1974)
Male: 50 + 2.3 × (H − 60)
Female: 45.5 + 2.3 × (H − 60)
Robinson (1983)
Male: 52 + 1.9 × (H − 60)
Female: 49 + 1.7 × (H − 60)
Miller (1983)
Male: 56.2 + 1.41 × (H − 60)
Female: 53.1 + 1.36 × (H − 60)
H = height in inches above 5 ft (60 in)