Comprehensive Calculator Guide
This calculator works out BMI as usual but reads it against the range suited to people over 65: 23 to under 30, rather than 18.5–25 for younger adults. 70 kg at 165 cm gives 25.7, recommended for older adults. 52 kg at 160 cm gives 20.3 — “normal” for the young, but below the recommended range in later life and worth attention.
Why the range shifts with age
Muscle declines and height shrinks with age, and slight excess weight isn’t linked to higher risk in older adults, while thinness clearly is. A 2014 analysis found the lowest mortality at about 24–31, rising below 23.
Muscle matters as much as weight: walking, light resistance work and about 1–1.2 g of protein per kg help, unless kidney disease rules it out. Losing 5% of weight in 6–12 months without trying deserves a doctor’s visit.
How to Use
- Enter current weight.
- Enter height.
- Press “Calculate BMI” to see your BMI, its category for older adults and the recommended weight range.
Formula Used
BMI = weight (kg) ÷ height (m)² | Recommended after 65: 23 to under 30
Practical Examples
- Example 1
- 70 kg, 165 cm: 25.7; recommended range 62.6–81.4 kg.
- Example 2
- 52 kg, 160 cm: 20.3; below the 58.9 kg minimum.
Important Tips
- Weigh monthly at the same time and note the figure.
Common Mistakes to Avoid
- Applying the 18.5–25 range to older adults.
Frequently Asked Questions
- What is a healthy BMI for older adults?
- About 23 to under 30 after 65.
- Is being overweight harmful in old age?
- Slight excess isn’t linked to higher risk; obesity (30+) still raises joint, heart and diabetes problems.
- When is weight loss in older adults a concern?
- Losing 5% or more in 6–12 months without trying.