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Free human to dog years calculator: enter your age and a breed size to see how old you are in dog years using the same non-linear curve vets cite (15 + 9 + size multiplier) — reversed. Not the ×7 myth. Pet owners converting a dog’s age should use our dog years calculator.
Last updated: May 25, 2026
Calculating your dog’s age instead? Dog years calculator
Giant breeds map the same human age to fewer dog years because their lifespan is shorter.
3
years2
monthsPet owners usually need dog → human years. This tool answers the reverse question for fun and education.
30 human years · Medium (21–50 lb)
3 yr 2 mo
Adult
210
Real model ≈ 3.2 dog years
≈ 29.8 yr
Should be near 30
7 human · medium
~6 mo (Puppy)
15 human · medium
~1 yr 0 mo (Adult)
24 human · medium
~2 yr 0 mo (≈ 2 dog years)
30 human · medium
~3 yr 2 mo (Adult)
50 human · medium
~7 yr 2 mo (Senior)
60 human · toy vs giant
toy ~11 yr · giant ~7.2 yr
| Human age | Small | Medium | Large | Giant |
|---|---|---|---|---|
| 7 | 0.5 | 0.5 | 0.5 | 0.5 |
| 15 | 1 | 1 | 1 | 1 |
| 24 | 2 | 2 | 2 | 2 |
| 30 | 3.5 | 3.2 | 3 | 2.8 |
| 40 | 6 | 5.2 | 4.7 | 4.3 |
| 50 | 8.5 | 7.2 | 6.3 | 5.8 |
| 60 | 11 | 9.2 | 8 | 7.2 |
Dog years shown as decimal years (e.g. 3.2 = 3 years 2.4 months). After human age 24: +1 dog year per 4 / 5 / 6 / 7 human years.
≈ 15 human years
Rapid puppy development
+9 (total 24) human years
Young adult maturity
Size-dependent human years
+4 to +7 human years per dog year
Small (under 20 lb)
Chihuahua, Maltese, terriers
+4 human years per dog year · senior ≈ 7 dog years
Reverse: +1 dog year per 4 human years (after human age 24)
Medium (21–50 lb)
Beagle, spaniel, bulldog
+5 human years per dog year · senior ≈ 7 dog years
Reverse: +1 dog year per 5 human years (after human age 24)
Large (51–100 lb)
Labrador, shepherd, boxer
+6 human years per dog year · senior ≈ 6 dog years
Reverse: +1 dog year per 6 human years (after human age 24)
Giant (over 100 lb)
Great Dane, mastiff, St. Bernard
+7 human years per dog year · senior ≈ 5 dog years
Reverse: +1 dog year per 7 human years (after human age 24)
Dogs mature quickly in year one (~15 human years), add ~9 human years in year two (total 24), then slow down with size-specific rates. This page inverts that curve so you can ask “if I aged like a medium dog, how many dog years would I be?”
See if friends are puppies or seniors in dog time