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Free dog years calculator. Convert dog age to human years with the phased AVMA model (15 + 9 + size-based years) — not the outdated multiply-by-7 rule.
Last updated: May 24, 2026
Reverse direction? Human to dog years
Human age (AVMA-style)
29human years
24 + 1.0 dog-yr × 5 = 29 human years (medium size).
Epigenetic estimate is Lab-biased research — AVMA-style number is default for vet charts.
29
human years · Adult stage
21
3 × 7 — outdated shortcut
24
All sizes → 24 human years
6 months
7.5 yr
1 dog year
15 yr
10 yr · giant
80 yr
15 yr · toy
76 yr
| Dog age | Small | Medium | Giant |
|---|---|---|---|
| 2 years | 24 human yr | 24 human yr | 24 human yr |
| 5 years | 36 human yr | 36 human yr | 45 human yr |
| 10 years | 56 human yr | 64 human yr | 80 human yr |
| 15 years | 76 human yr | 89 human yr | 115 human yr |
At 10 dog years: toy 56 · medium 64 · giant 80 human years (computed).
| Size | +Human yrs / dog yr | Senior ~dog yr | Examples |
|---|---|---|---|
| Small (under 20 lb) | +4 | 7+ | Chihuahua, Maltese, terriers |
| Medium (21–50 lb) | +5 | 7+ | Beagle, spaniel, bulldog |
| Large (51–100 lb) | +6 | 6+ | Labrador, shepherd, boxer |
| Giant (over 100 lb) | +7 | 5+ | Great Dane, mastiff, St. Bernard |
| Phase | Dog time | Human years | Note |
|---|---|---|---|
| Year 1 | 0–12 months | ≈ 15 | Rapid puppy development |
| Year 2 | 12–24 months | +9 (total 24) | Young adult maturity |
| Year 3+ | After month 24 | Size-dependent | +4 to +7 human years per dog year |
Replace the multiply-by-7 myth with size-adjusted human age for vet visits.