Ideal Weight Calculator
Frequently Asked Questions
How is ideal weight calculated?
Ideal weight is calculated using several established medical formulas, each developed through different research methods:
- Devine Formula (1974): Originally developed for calculating drug dosages, widely used in clinical settings
- Robinson Formula (1983): A modification of the Devine formula based on updated data
- Miller Formula (1983): Another modification providing slightly different estimates
- Hamwi Formula (1964): One of the earliest formulas, commonly used by dietitians
All formulas use height and gender as primary factors, calculating a base weight for the first 5 feet (152 cm) and adding incremental weight for each additional inch.
Which ideal weight formula is best?
No single formula is universally "best" - each has its strengths:
- Devine: Most commonly used in medicine for drug dosing calculations
- Robinson: Often considered most accurate for average individuals
- Miller: Tends to give slightly higher estimates, may suit larger frames
- Hamwi: Traditional formula still used by many nutrition professionals
We recommend looking at the range of all formulas rather than relying on any single one. A healthy weight can fall anywhere within this range.
Does frame size matter for ideal weight?
Yes, body frame size can influence your ideal weight:
- Small frame: Ideal weight may be about 10% lower than average
- Medium frame: Standard formula results apply
- Large frame: Ideal weight may be about 10% higher than average
You can estimate your frame size by wrapping your thumb and middle finger around your wrist. If they overlap, you have a small frame; if they just touch, medium; if they don't meet, large frame.
What's the difference between ideal weight and healthy weight?
These terms are related but have important distinctions:
- Ideal weight: A single target number calculated by formulas based on height and gender
- Healthy weight: A range of weights considered medically healthy, typically based on BMI of 18.5-24.9
The healthy BMI weight range is often broader than the "ideal" weight calculated by formulas. Both are useful references, but neither accounts for muscle mass, bone density, or overall fitness level. Consult a healthcare provider for personalized guidance.