How this page is reviewed
| Risk tier | YMYL |
|---|---|
| Author | Calculover Editorial Team Health education |
| Editorial owner | Calculover Health Desk Health calculator owner |
| Reviewer | Calculover Editorial Review Medical-source review |
| Last reviewed | 2026-05-11 |
| Last verified | 2026-05-11 |
| Data effective date | 2026-05-11 |
Methodology
Ideal Body Weight Resource uses body measurement formulas from the page formula section to convert height, weight, age, sex, and optional circumference inputs into screening or wellness estimates. Results are framed as estimates for education, not as a diagnosis of body fatness, health risk, or disease.
Assumptions
- Height, weight, and circumference measurements are current and taken consistently, preferably without heavy clothing and with the same units selected in the calculator.
- Adult BMI categories use standard CDC adult screening thresholds unless the calculator explicitly asks for pediatric age inputs or percentiles.
- Body-composition formulas estimate population averages and do not directly measure fat mass, lean mass, bone density, or visceral fat.
Limitations
- BMI and related screening formulas can misclassify children and teens, pregnant or recently pregnant people, older adults with low muscle mass, and athletes or very muscular users.
- Body composition, ethnicity, medication use, edema, eating disorders, disability, and clinical history can change what a weight or circumference result means.
- Do not use this result by itself to diagnose obesity, malnutrition, cardiovascular risk, or eligibility for medication, surgery, or a treatment plan.
Sources
- Adult BMI Calculator, Centers for Disease Control and Prevention
- BMI Frequently Asked Questions, Centers for Disease Control and Prevention
- Steps for Losing Weight, Centers for Disease Control and Prevention
Professional guidance: Ideal Body Weight Resource is a wellness screening tool, not medical advice. Use it as a starting point and discuss weight, body-composition, pregnancy, adolescent, athletic, or health-condition concerns with a licensed healthcare professional.
Ideal body weight (IBW) is a target weight range based on height, frame size, and sex. Multiple formulas exist (Devine, Hamwi, Robinson, Miller), each producing slightly different results.
Common IBW Formulas
The Devine formula (most widely used in medicine): Men: 50 kg + 2.3 kg per inch over 5 feet. Women: 45.5 kg + 2.3 kg per inch over 5 feet.
These formulas were originally developed for medication dosing, not as weight goals. They do not account for body composition, muscle mass, or age.
Why Ranges Matter
There is no single "ideal" weight. A healthy weight range depends on body composition, fitness level, age, and individual health markers. Two people at the same height can have very different healthy weights based on muscle mass and frame size.
Real-World Example
For a 5'8" male: Devine formula = 50 + (2.3 × 8) = 68.4 kg (151 lbs). Hamwi formula gives 154 lbs. Robinson gives 155 lbs. The range of 151-155 lbs serves as a general reference point, not a strict target.
Frequently Asked Questions
Is ideal body weight the same as healthy weight?
Not exactly. IBW formulas provide a mathematical estimate, while a healthy weight considers the full picture: body fat percentage, blood pressure, cholesterol, blood sugar, fitness level, and how you feel. Many people are healthy above or below their calculated IBW.
Which IBW formula is best?
The Devine formula is most commonly used in clinical settings. However, all IBW formulas are simplistic. For personal goals, using a BMI range of 20-25 combined with body fat percentage gives a more personalized and useful target.
Does frame size affect ideal weight?
Yes. People with larger bone structure may have a healthy weight 10-15% above standard IBW formulas. Wrist circumference and elbow breadth are common methods for estimating frame size (small, medium, or large).