Rat age in human years

Enter your Rat's age in the calculator above. We use a science-based formula for small mammals — not the old "multiply by seven" rule — and show life stage and lifespan context with your result.

Rats are often cited as living around 3 years on average. Individual animals vary with diet, genetics, and care.

Pick Rat (already selected here), enter age in years or use date of birth when available, then calculate. You'll see human-year equivalent, life stage, and how far through a typical lifespan your pet may be.