🧓 Geriatric BMI Calculator
Calculate BMI for older adults using the standard formula, with reference ranges adjusted for age 65 and over, where slightly higher BMI is often considered healthy.
Why BMI is interpreted differently for older adults
BMI for older adults is calculated with the exact same formula used for younger adults, but many geriatric health guidelines use somewhat higher reference ranges, since research suggests a slightly higher BMI (roughly 23 to 30) is often associated with better health outcomes and lower mortality risk in people aged 65 and over, compared with the standard adult ranges.
How this calculator works
The calculator computes BMI using the standard formula: weight in kilograms divided by height in meters squared. It then reports both a geriatric-adjusted weight category (using a healthy range of roughly 23 to 30) and the standard adult category (using the typical 18.5 to 25 healthy range) for comparison.
- Muscle loss and height changes that come with aging can affect how accurately BMI reflects body composition in older adults.
- Geriatric BMI reference ranges vary somewhat between health organizations; the ranges used here reflect commonly cited general guidance.
This tool is for general educational and planning purposes only and is not a substitute for advice from a doctor or geriatric health specialist.