Ideal Body Weight Calculator
Estimate your ideal body weight using four widely recognized formulas. Compare results from the Devine, Robinson, Miller, and Hamwi equations to find a healthy weight range for your height.
How This Calculator Works
Formula: Devine, Robinson, Miller, and Hamwi Formulas
This calculator uses four established ideal body weight formulas. The Devine formula (1974) is widely used in clinical settings for drug dosing. The Robinson formula (1983) was developed as a refinement. The Miller formula (1983) tends to produce slightly higher estimates. The Hamwi formula (1964) is one of the earliest and most commonly referenced. All formulas use height and sex as inputs, with a base weight for the first 5 feet of height plus incremental weight per additional inch.
Limitations
- These formulas were developed decades ago using limited population samples and may not reflect current population diversity.
- They do not account for body frame size, muscle mass, age, or ethnicity.
- Ideal body weight is a general guideline, not a definitive health standard.
- Results should be interpreted as a range rather than a single target number.
These calculations are estimates based on established formulas. Individual results vary. Consult a healthcare professional before making significant changes to your diet or exercise routine.
Ideal body weight (IBW) calculators provide a reference range for what a person of a given height might weigh under typical body composition conditions. These formulas were originally developed for clinical purposes, including medication dosing and nutritional assessments.
This calculator presents results from four established formulas, each developed by different researchers. The Devine formula is perhaps the most widely used, particularly in pharmacology for weight-based drug dosing. The Robinson and Miller formulas were developed as refinements, while the Hamwi formula is one of the earliest reference standards.
Rather than fixating on a single number, the value of these formulas lies in establishing a general range. The variation between formulas typically spans 5-15 pounds, which reflects the inherent uncertainty in defining an ideal weight from height alone.
It is important to understand that ideal body weight is a simplified concept. Two people of the same height can have very different healthy weights depending on their muscle mass, bone density, body frame, and overall body composition. An athletic individual with significant lean mass may weigh considerably more than these formulas suggest while being in excellent health.
These formulas also do not account for age-related changes in body composition. As people age, body composition naturally shifts, and what constitutes a healthy weight may change accordingly. Use these results as a general reference point rather than a strict target, and consider them alongside other metrics such as BMI, body fat percentage, and waist circumference for a more complete assessment.