Everyday Tools
Cat Age Calculator
Cat years by the veterinary convention — 15, 24, then +4 a year.
✓ Free
✓ No account
◉ Runs on this device
Everyday Tools
Powering up the tool…
TOOL CAT-AGE-CALC
What this tool does
About the cat age calculator
Life stages included; indoor/outdoor honesty supplied.
How to use it
- Enter the cat’s age.
- Read the equivalent and stage.
- Senior starts ~11 — screening conversations begin.
- A 20-year-old cat is ~96: address her accordingly.
Useful for
- Translate the cat’s age for the household.
- Frame senior-care timing.
- Win the dog-vs-cat ageing argument with numbers.
Straight answers
Cat Age Calculator FAQ
Why 15 + 9 + 4s instead of a formula?
The veterinary convention: cats mature explosively (year one ≈ 15 human years, year two adds 9) then age steadily (+4/year). It matches feline development stages well enough that vets still teach it — simpler than the dogs’ logarithm, no less honest.
Indoor vs outdoor — how big a deal?
The biggest: indoor cats average 12–18 years, unsupervised outdoor closer to 5 — traffic and misadventure, not biology. The convention converts age; the lifestyle writes the lifespan.