Cat and dog ages at a glance
Human-age equivalents, rounded to the nearest year. The cat column follows the scale in the AAHA/AAFP feline life stage guidelines; the dog columns follow the size-based chart veterinary sources commonly publish, sorted by adult weight (small 20 lb or less, medium 21–50 lb, large 51–90 lb, giant over 90 lb).
| Age | Cat | Small dog | Medium dog | Large dog | Giant dog |
|---|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 | 24 | 24 |
| 3 | 28 | 28 | 29 | 30 | 31 |
| 4 | 32 | 32 | 33 | 35 | 38 |
| 5 | 36 | 36 | 38 | 41 | 45 |
| 6 | 40 | 40 | 42 | 46 | 52 |
| 7 | 44 | 44 | 47 | 52 | 59 |
| 8 | 48 | 48 | 51 | 57 | 66 |
| 10 | 56 | 56 | 60 | 68 | 80 |
| 12 | 64 | 64 | 69 | 79 | 94 |
| 14 | 72 | 72 | 78 | 90 | 108 |
| 16 | 80 | 80 | 87 | 101 | 122 |
These are conventions for picturing a pet's stage of life, not biological measurements. Aging varies by breed and by individual, and questions about your pet's health belong with your veterinarian.
Chicken space per hen
Commonly cited minimums; the coop calculator multiplies them by your flock size.
| Per hen | Bantam | Standard | Large breed |
|---|---|---|---|
| Coop floor | 2 sq ft | 4 sq ft | 6 sq ft |
| Run | 5 sq ft | 10 sq ft | 15 sq ft |
| Roost bar | 8 in | 10 in | 12 in |
Which calculator do you need?
The cat age calculator converts years and months to human years and names the life stage, and works in reverse too. The dog age calculator shows the size chart and the epigenetic formula from a Labrador study side by side. The chicken coop size calculator turns a head count into coop floor, run, roost, nest box and ventilation numbers, with a suggested footprint to build.