BMI Calculator for Seniors Over 65
Created by: Sophia Bennett
Last updated:
BMI is calculated the same way at every age, but it is read differently after 65. For older men and women, a BMI of about 23 to 29.9 is linked to the lowest risk; below 23 signals a risk of undernutrition, even though it counts as normal for younger adults. For a 5′9″ man that range is about 156 to 202 lb. Enter your height and weight to see where you fall.
BMI Calculator for Seniors Over 65
HealthYour BMI read against the ranges for older adults, with a healthy weight range for your height.
BMI chart for seniors: weight by height
Weight range for a BMI of 23 to 29.9 at each height, the range linked to the lowest risk after 65. Below the first column counts as low for an older adult.
| Height | BMI 23 to 29.9 (lb) | BMI 23 to 29.9 (kg) |
|---|---|---|
| 4′ 10″ (147 cm) | 110 to 143 | 50 to 65 |
| 4′ 11″ (150 cm) | 114 to 148 | 52 to 67 |
| 5′ 0″ (152 cm) | 118 to 153 | 53 to 69 |
| 5′ 1″ (155 cm) | 122 to 158 | 55 to 72 |
| 5′ 2″ (157 cm) | 126 to 163 | 57 to 74 |
| 5′ 3″ (160 cm) | 130 to 169 | 59 to 77 |
| 5′ 4″ (163 cm) | 134 to 174 | 61 to 79 |
| 5′ 5″ (165 cm) | 138 to 180 | 63 to 82 |
| 5′ 6″ (168 cm) | 143 to 185 | 65 to 84 |
| 5′ 7″ (170 cm) | 147 to 191 | 67 to 87 |
| 5′ 8″ (173 cm) | 151 to 197 | 69 to 89 |
| 5′ 9″ (175 cm) | 156 to 202 | 71 to 92 |
| 5′ 10″ (178 cm) | 160 to 208 | 73 to 95 |
| 5′ 11″ (180 cm) | 165 to 214 | 75 to 97 |
| 6′ 0″ (183 cm) | 170 to 220 | 77 to 100 |
| 6′ 1″ (185 cm) | 174 to 227 | 79 to 103 |
| 6′ 2″ (188 cm) | 179 to 233 | 81 to 106 |
| 6′ 3″ (191 cm) | 184 to 239 | 83 to 109 |
| 6′ 4″ (193 cm) | 189 to 246 | 86 to 111 |
How BMI is read after 65
BMI = weight (kg) ÷ height (m)²
BMI = 703 × weight (lb) ÷ height (in)²
| BMI | Standard adult category | Reading for 65 and older |
|---|---|---|
| Under 18.5 | Underweight | Underweight |
| 18.5 to 22.9 | Normal weight | Low: nutrition risk |
| 23 to 24.9 | Normal weight | Healthy range |
| 25 to 29.9 | Overweight | Healthy range |
| 30 to 34.9 | Obesity class I | Obesity class I |
| 35 and over | Obesity class II+ | Obesity class II+ |
The standard categories were set from studies of mostly middle-aged adults. In older adults, a little extra weight is linked to better survival, partly because it provides reserves during illness and partly because low weight often reflects muscle loss. This is sometimes called the obesity paradox. It does not make obesity harmless: waist size, strength and mobility still matter.
Beyond BMI
- Waist: over 40 inches (102 cm) for men or 35 inches (88 cm) for women signals higher cardiometabolic risk.
- Weight trend: unplanned loss of 5% or more in 6 to 12 months matters more than any single reading.
- Strength: slow walking speed or difficulty rising from a chair can point to sarcopenia even at a healthy BMI.
Frequently Asked Questions
What is a healthy BMI for someone over 65?
Most research puts the lowest-risk range for adults 65 and older at about 23 to 30, higher than the 18.5 to 24.9 used for younger adults. A 2014 meta-analysis of 32 studies found death risk was lowest around BMI 27 to 28, rose below 23, and did not climb until about 33.
Is the BMI formula different for seniors?
No. BMI is weight in kilograms divided by height in meters squared (or 703 × pounds ÷ inches²) at every age. What changes after 65 is how the result is read: a BMI of 22 counts as normal at 40 but is on the low side at 75.
What is a good BMI for a man over 65?
The same 23 to 29.9 range applies to men and women. For a 5′10″ man that is about 160 to 208 lb. Men also tend to carry more abdominal fat, so a waist over 40 inches (102 cm) is a separate warning sign even at a healthy BMI.
Should I measure height again as I get older?
Yes. Adults lose height with age, often 1 to 3 inches by their 80s, from disc compression and posture. Using an old, taller height makes BMI read too low. If you cannot stand straight, a clinician can estimate height from knee height or arm span.
Why is a low BMI a concern for older adults?
Low weight in later life often means lost muscle (sarcopenia) and reserves. It is linked to falls, fractures, slower recovery from illness and higher mortality. Unplanned loss of more than 5% of body weight in 6 to 12 months is worth raising with a doctor whatever the BMI.
How much protein do people over 65 need?
The PROT-AGE expert group recommends 1.0 to 1.2 grams per kilogram of body weight a day for healthy adults over 65, and 1.2 to 1.5 g/kg for those with acute or chronic illness. That is about 68 to 82 g a day for a 150 lb person, more than the 0.8 g/kg general guideline.
Sources and References
- Winter JE, MacInnis RJ, Wattanapenpaiboon N, Nowson CA. BMI and all-cause mortality in older adults: a meta-analysis. Am J Clin Nutr. 2014;99(4):875-890.
- Bauer J, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc. 2013;14(8):542-559.
- Mini Nutritional Assessment (MNA). Nestlé Nutrition Institute. Scores BMI below 23 as a nutrition risk.
- CDC, Adult BMI Categories.
- NHLBI, Assessing Your Weight and Health Risk. Waist circumference thresholds.