Dog Age Calculator

Convert your dog's age into human-equivalent years.

Human-equivalent age (years) 39

Formula: 1st year ≈ 15, 2nd ≈ +9, then ≈ +5 per year

Step-by-step with your numbers:

1. Values used:

2. Dog's age = 5 years

4. Human-equivalent age = 39years

Did we solve your problem today?

A more realistic 'dog years' estimate than the old ×7 rule — dogs age fast early, then slow down.

The math behind it

The first year ≈ 15 human years, the second adds ~9, and each year after adds ~5. Large breeds age faster than small ones.

A 5-year-old dog → 24 + (5 − 2) × 5 = 39 human years.

Is the ×7 rule accurate?

No — it overstates early aging. This staged formula is closer to reality.