Skip to content Calculate your Ideal Body Weight (IBW) across all five peer-reviewed equations—Devine (1974), Robinson (1983), Miller (1983), Hamwi (1964), and Peterson (2016)—adjusted for your skeletal wrist frame size, plus Adjusted Body Weight (AjBW), Waist-to-Height Ratio (WHtR), and Target Body-Fat Goal Weight for muscular athletes.
papalex-20), we may earn an affiliate commission at no extra cost to you.In clinical medicine, Ideal Body Weight (IBW) is most commonly calculated using the Devine (1974) and Hamwi (1964) equations based on height over 5 feet (60 inches) and biological sex. Under the Devine formula, men start at 50 kg (110.2 lbs) for the first 5 feet plus 2.3 kg (5.07 lbs) per additional inch; women start at 45.5 kg (100.3 lbs) plus 2.3 kg (5.07 lbs) per inch over 5 feet. Under the Hamwi dietetic formula, men start at 106 lbs + 6 lbs/inch and women start at 100 lbs + 5 lbs/inch, modified by −10% for a small skeletal frame or +10% for a large skeletal frame.
Interactive Ideal Body Weight (IBW), Frame Size & Adjusted Weight Calculator
Select your biological sex, height, skeletal frame size (or wrist circumference), and optional current weight to compare all 5 clinical IBW models, healthy BMI ranges, Adjusted Body Weight (AjBW), and muscular athlete goal weight.
1. Devine Formula (1974)
160.9 lbs (73.0 kg)Frame-Adjusted: 160.9 lbs • Universal hospital pharmacokinetic dosing reference.
2. Robinson Formula (1983)
156.5 lbs (71.0 kg)Frame-Adjusted: 156.5 lbs • Derived from Metropolitan Life actuarial longevity tables.
3. Miller Formula (1983)
155.0 lbs (70.3 kg)Frame-Adjusted: 155.0 lbs • Higher base weight with gentler slope for tall statures.
4. Hamwi Formula (1964)
166.0 lbs (75.3 kg)Frame-Adjusted: 166.0 lbs • Clinical dietetics standard (±10% for small/large frame).
5. Peterson Equation (2016)
153.4 lbs (69.6 kg)Evaluated at BMI 22.0 • Modern continuous equation accurate even under 5 feet.
Height-to-Wrist Ratio (r = H / W)
r = 10.16 (Medium Frame)Men: Small >10.4 | Medium 9.6–10.4 | Large <9.6. Women: Small >11.0 | Medium 10.1–11.0 | Large <10.1.
Small / Medium / Large Hamwi Brackets
149 / 166 / 183 lbsShows how skeletal breadth shifts your healthy target weight by up to 34 lbs at the exact same height.
If you lift weights or run, standard IBW charts ignore your muscle mass. Enter your estimated Current Body Fat % and Goal Body Fat % to calculate your exact composition-based ideal weight while preserving 100% of your Lean Body Mass:
Your Current Lean Body Mass
144.6 lbs (65.6 kg)Non-fat muscle, bone, and organ weight to preserve during fat loss.
Athlete Ideal Target Weight
168.2 lbs (76.3 kg)Formula: LBM / (1 − Goal BF%). Fat to lose: 12.6 lbs (5.7 kg).
Waist-to-Height Ratio (WHtR)
0.47 • Healthy Central ZoneYour waist is under the 0.50 NICE cardiometabolic threshold (Max healthy waist for your height: 88.9 cm / 35.0 in).
Pharmacokinetic vs. Dietetic AjBW
76.6 kg (0.4) | 75.3 kg (0.25)Used clinically when actual body weight exceeds Devine IBW by more than 20%–30% because adipose tissue has lower extracellular water distribution.
1. The 5 Clinical Ideal Body Weight (IBW) Formulas Explained
Contrary to popular belief, Ideal Body Weight (IBW) equations were not invented to set aesthetic fitness goals. They originated in mid-20th-century actuarial longevity research and hospital pharmacokinetics, where physicians needed a rapid way to estimate a patient’s lean drug distribution volume without letting excess adipose tissue cause a medication overdose (such as with aminoglycoside antibiotics, theophylline, or neuromuscular blockers).
Because each equation uses a slightly different baseline weight at 5 feet (60 inches / 152.4 cm) and a different slope per inch of height above 5 feet, comparing all five gives you a realistic clinical corridor rather than a rigid single number:
2. Complete Men’s & Women’s Ideal Body Weight Chart by Height
The reference tables below compare the Devine, Robinson, Miller, and Hamwi (Medium Frame) formulas alongside the full World Health Organization (WHO) Healthy BMI Range (18.5–24.9 kg/m²) so you can see both the clinical midpoint and the broader healthy weight corridor for your stature.
Men’s Ideal Body Weight Reference Chart (5'0" to 6'5")
| Height (ft/in) | Height (cm) | Devine IBW | Robinson IBW | Miller IBW | Hamwi (Med Frame) | WHO Healthy BMI Range (18.5–24.9) |
|---|---|---|---|---|---|---|
| 5'2" | 157.5 cm | 120 lbs (54.6 kg) | 123 lbs (55.8 kg) | 130 lbs (59.0 kg) | 118 lbs (53.5 kg) | 101 – 136 lbs (45.9 – 61.7 kg) |
| 5'4" | 162.6 cm | 131 lbs (59.2 kg) | 131 lbs (59.6 kg) | 136 lbs (61.8 kg) | 130 lbs (59.0 kg) | 108 – 145 lbs (48.9 – 65.8 kg) |
| 5'6" | 167.6 cm | 141 lbs (63.8 kg) | 140 lbs (63.4 kg) | 143 lbs (64.7 kg) | 142 lbs (64.4 kg) | 115 – 154 lbs (52.0 – 70.0 kg) |
| 5'8" | 172.7 cm | 151 lbs (68.4 kg) | 148 lbs (67.2 kg) | 149 lbs (67.5 kg) | 154 lbs (69.9 kg) | 122 – 164 lbs (55.2 – 74.3 kg) |
| 5'10" | 177.8 cm | 161 lbs (73.0 kg) | 157 lbs (71.0 kg) | 155 lbs (70.3 kg) | 166 lbs (75.3 kg) | 129 – 174 lbs (58.5 – 78.7 kg) |
| 6'0" | 182.9 cm | 171 lbs (77.6 kg) | 165 lbs (74.8 kg) | 161 lbs (73.1 kg) | 178 lbs (80.7 kg) | 136 – 184 lbs (61.9 – 83.3 kg) |
| 6'2" | 188.0 cm | 181 lbs (82.2 kg) | 173 lbs (78.6 kg) | 167 lbs (75.9 kg) | 190 lbs (86.2 kg) | 144 – 194 lbs (65.4 – 88.0 kg) |
| 6'4" | 193.0 cm | 191 lbs (86.8 kg) | 182 lbs (82.4 kg) | 174 lbs (78.8 kg) | 202 lbs (91.6 kg) | 152 – 205 lbs (68.9 – 92.8 kg) |
Women’s Ideal Body Weight Reference Chart (4'10" to 6'0")
| Height (ft/in) | Height (cm) | Devine IBW | Robinson IBW | Miller IBW | Hamwi (Med Frame) | WHO Healthy BMI Range (18.5–24.9) |
|---|---|---|---|---|---|---|
| 4'11" | 149.9 cm | 95 lbs (43.2 kg) | 104 lbs (47.3 kg) | 114 lbs (51.7 kg) | 95 lbs (43.1 kg) | 92 – 123 lbs (41.6 – 55.9 kg) |
| 5'1" | 154.9 cm | 105 lbs (47.8 kg) | 112 lbs (50.7 kg) | 120 lbs (54.5 kg) | 105 lbs (47.6 kg) | 98 – 132 lbs (44.4 – 59.8 kg) |
| 5'3" | 160.0 cm | 115 lbs (52.4 kg) | 119 lbs (54.1 kg) | 126 lbs (57.2 kg) | 115 lbs (52.2 kg) | 104 – 141 lbs (47.4 – 63.7 kg) |
| 5'5" | 165.1 cm | 126 lbs (57.0 kg) | 127 lbs (57.5 kg) | 132 lbs (59.9 kg) | 125 lbs (56.7 kg) | 111 – 150 lbs (50.4 – 67.9 kg) |
| 5'7" | 170.2 cm | 136 lbs (61.6 kg) | 134 lbs (60.9 kg) | 138 lbs (62.6 kg) | 135 lbs (61.2 kg) | 118 – 159 lbs (53.6 – 72.1 kg) |
| 5'9" | 175.3 cm | 146 lbs (66.2 kg) | 142 lbs (64.3 kg) | 144 lbs (65.3 kg) | 145 lbs (65.8 kg) | 125 – 169 lbs (56.8 – 76.5 kg) |
| 5'11" | 180.3 cm | 156 lbs (70.8 kg) | 149 lbs (67.7 kg) | 150 lbs (68.1 kg) | 155 lbs (70.3 kg) | 133 – 178 lbs (60.2 – 81.0 kg) |
3. How to Measure Your Skeletal Frame Size Accurately (Height-to-Wrist r-Ratio)
Two runners of the exact same height (e.g., 5'9" / 175 cm) can have completely different healthy weights if one has narrow clavicles, thin wrists, and small ankle joints while the other has broad shoulders, thick cortical bone structure, and dense joints. In clinical nutrition, skeletal frame size is determined using Dr. J.P. Grant’s (1980) Height-to-Wrist Circumference Ratio (r = Height in cm / Wrist Circumference in cm) or direct wrist circumference brackets:
| Sex & Stature Bracket | Small Bone Frame (−10% IBW) | Medium Bone Frame (Standard IBW) | Large Bone Frame (+10% IBW) |
|---|---|---|---|
| Men (r-Ratio Method, All Heights) | r > 10.4 (Wrist < 6.5" / 16.5 cm at 5'6"+) | r = 9.6 to 10.4 (Wrist 6.5"–7.5" / 16.5–19.0 cm) | r < 9.6 (Wrist > 7.5" / 19.0 cm) |
| Women (r-Ratio Method, All Heights) | r > 11.0 | r = 10.1 to 11.0 | r < 10.1 |
| Women Under 5'2" (< 157 cm) | Wrist < 5.5" (< 14.0 cm) | Wrist 5.5" – 5.75" (14.0 – 14.6 cm) | Wrist > 5.75" (> 14.6 cm) |
| Women 5'2" to 5'5" (157 – 165 cm) | Wrist < 6.0" (< 15.2 cm) | Wrist 6.0" – 6.25" (15.2 – 15.9 cm) | Wrist > 6.25" (> 15.9 cm) |
| Women Over 5'5" (> 165 cm) | Wrist < 6.25" (< 15.9 cm) | Wrist 6.25" – 6.5" (15.9 – 16.5 cm) | Wrist > 6.5" (> 16.5 cm) |
4. What Is Adjusted Body Weight (AjBW) and When Should You Use It?
When an individual’s actual scale weight exceeds their Devine Ideal Body Weight by more than 20% to 30%, using total body weight in calorie or medication formulas overestimates metabolic demand, while using IBW alone underestimates it. Why? Because roughly 25% to 40% of the excess weight gained above IBW consists of metabolically active lean tissue (extra muscle fibers, expanded blood volume, connective tissue, and bone mass required to carry the extra load), while the remaining 60% to 75% is less vascularized adipose tissue.
To account for this, hospital pharmacists and clinical dietitians calculate Adjusted Body Weight (AjBW):
- Pharmacokinetic / Clinical Standard (0.40 Factor):
AjBW = IBW + 0.40 × (Actual Weight − IBW) - Conservative Dietetic Energy Standard (0.25 Factor):
AjBW = IBW + 0.25 × (Actual Weight − IBW)
If your current weight is more than 25% above your IBW, plugging your AjBW (or your direct Lean Body Mass) into energy expenditure equations prevents overestimating your daily maintenance calories.
5. Why Standard IBW Formulas Fail Muscular Athletes (And the Exact Fix)
Look closely at the Devine formula for a 5'10" (178 cm) male: it outputs 160.9 lbs (73.0 kg), which corresponds to a BMI of 23.1 kg/m². That works well for an untrained adult or a lightweight marathoner. However, what if that 5'10" athlete has spent five years strength training, carries 155 lbs (70.3 kg) of Lean Body Mass (Normalized FFMI of 22.2 kg/m²), and has 12% body fat? Their healthy, lean athletic weight is 176 lbs (79.9 kg)—full 15 pounds heavier than Devine IBW!
If a strength athlete or CrossFit runner tried to diet down to their unadjusted Devine IBW of 161 lbs, they would have to catabolize muscle tissue or drop to an unsustainable 8% body fat. Instead, athletes should always calculate their Target Body-Fat Weight (Tab 3 in our calculator above):
Target Weight = Current Lean Body Mass / (1 − Target Body Fat %)Example: A 5'6" female lifter weighs 155 lbs at 26% body fat (
LBM = 155 × 0.74 = 114.7 lbs). To reach an athletic 20% body fat while keeping 100% of her muscle, her true goal weight is 114.7 / (1 − 0.20) = 143.4 lbs—not the 128-lb Devine chart number!
6. Waist-to-Height Ratio (WHtR < 0.50): The Ultimate Tiebreaker
How do you know for certain whether weighing 15 to 25 pounds above your IBW chart number is harmless skeletal muscle or cardiometabolically risky visceral fat? In 2022, the UK National Institute for Health and Care Excellence (NICE) and Dr. Margaret Ashwell established the Waist-to-Height Ratio (WHtR = Waist / Height) as a superior predictor of cardiovascular and metabolic health compared to BMI or height-weight tables:
- WHtR 0.40 to 0.49 (Healthy Central Adiposity): Your waist circumference at the navel is less than half your height. Even if your scale weight sits 15–20 lbs above Devine IBW, a WHtR under 0.50 confirms low visceral organ fat and high lean mass.
- WHtR 0.50 to 0.59 (Increased Central Adiposity): Signals accumulating visceral abdominal fat; prioritizing a moderate 300–500 kcal daily deficit via our TDEE Calculator and Zone 2 aerobic running will improve insulin sensitivity and lipid markers.
- WHtR ≥ 0.60 (High Cardiometabolic Risk): Strongly warrants clinical evaluation and structured nutrition/activity intervention regardless of height-weight formulas.
Recommended Anthropometric & Body Composition Tools
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Check RENPHO Smart Scale on Amazon →7. Frequently Asked Questions About Ideal Body Weight (IBW)
Which Ideal Body Weight formula is the most accurate?
In hospital medicine and pharmacology, the Devine (1974) formula is the universal reference standard. For nutrition and weight-management planning, combining the Hamwi (1964) frame-adjusted range (±10%) with the modern Peterson (2016) universal BMI equation provides the most realistic target corridor—especially for women and individuals shorter than 5'2".
Why do the Devine and Hamwi formulas give low numbers for short women?
Both Devine and Hamwi are linear equations anchored at 5'0" with a steep per-inch slope (5.07 lbs/inch for Devine). At 5'0" (60 inches), Devine assigns women 100.3 lbs (a lean BMI of 19.6), whereas for men at 6'0" it assigns 171 lbs (a BMI of 23.2). The Robinson (1983), Miller (1983), and Peterson (2016) equations corrected this sex/height skew by using a higher 5'0" baseline (108–117 lbs) and a gentler per-inch increment.
Does age change your Ideal Body Weight?
Standard IBW equations do not include age as a mathematical variable because adult skeletal height remains largely stable between ages 20 and 60, and gaining visceral fat with age is common but not physiologically "ideal." However, in adults over 65, geriatricians often favor a slightly higher BMI range (22.0 to 27.0 kg/m²) coupled with resistance training to protect against bone fractures, frailty, and sarcopenia.
How do I know if I have a small, medium, or large frame without calipers?
Measure the circumference of your wrist just distal to the bony prominence (styloid process) and divide your height (in cm) by your wrist circumference (in cm) to get your r-ratio. Alternatively, wrap your thumb and middle finger of one hand around the opposite wrist: if the fingers overlap noticeably, you likely have a small frame (−10%); if they just touch, a medium frame; if they do not meet, a large frame (+10%).
Should I use IBW or TDEE to set my daily calorie intake?
IBW tells you a reference body weight range, whereas your daily calorie target should be calculated from your Total Daily Energy Expenditure (TDEE) and Lean Body Mass. Once you review your IBW range here, enter your stats into our TDEE Calculator and Macro Calculator for Weight Loss to establish a sustainable 300–500 kcal daily deficit.
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Peer-Reviewed Scientific References
- Devine, B. J. (1974). Gentamicin therapy. Drug Intelligence & Clinical Pharmacy, 8, 650–655.
- Robinson, J. D., Lupkiewicz, S. M., Palenik, L., Lopez, L. M., & Ariet, M. (1983). Determination of ideal body weight for drug dosage calculations. American Journal of Hospital Pharmacy, 40(6), 1016–1019. PubMed: 6869387
- Miller, D. R., Carlson, J. D., Loyd, B. J., & Day, B. J. (1983). Determination of ideal body weight. American Journal of Hospital Pharmacy, 40(10), 1622.
- Peterson, C. M., Thomas, D. M., Blackburn, G. L., & Heymsfield, S. B. (2016). Universal equation for estimating ideal body weight and body weight at any BMI. The American Journal of Clinical Nutrition, 103(5), 1197–1203. PMC4841935
- Pai, M. P., & Paloucek, F. P. (2000). The origin of the “ideal” body weight equations. The Annals of Pharmacotherapy, 34(9), 1066–1069. PubMed: 10981254
- Ashwell, M., Gunn, P., & Gibson, S. (2012). Waist-to-height ratio is a better screening tool than waist circumference and BMI for adult cardiometabolic risk factors: systematic review and meta-analysis. Obesity Reviews, 13(3), 275–286. PubMed: 22106927
- Heymsfield, S. B., et al. (2021). Ideal body weight: a commentary. Clinical Nutrition ESPEN, 46, 46–51. ScienceDirect
