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Dog Age Calculator

Translate dog years to human equivalents using traditional breed size curves or the epigenetic UCSD formula.

Age Settings

Calculation Model

Dog Size Group

Dog Age (Years)

Months

Health & Care Guidelines

Set regular maintenance portion sizes to prevent early obesity.
Start positive dental cleaning habits (daily brushings or dental treats).
Keep up active outdoor games and structured agility exercises.

Human Age Equivalent

human years equivalent

Young Adult

Traditional Size Conversion Chart

Dog Age	Small (<20 lbs)	Medium (20–50 lbs)	Large (50–90 lbs)	Giant (>90 lbs)
1 yr	15	15	15	15
2 yrs	24	24	24	24
3 yrs	28	29	30	31
5 yrs	36	37	40	45
8 yrs	48	51	55	64
10 yrs	56	60	66	79
12 yrs	64	69	77	93
15 yrs	76	83	93	114
18 yrs	88	96	109	135

How dog years to human years conversion is determined

Traditional dog age calculators utilize a non-linear scale matching breed size categories. Large and giant breed dogs grow slightly slower as puppies but age much more rapidly as adults compared to toy and small breeds. This results in giant breeds entering senior life stages around 5–6 calendar years.

The alternative scientific formula was developed by University of California San Diego (UCSD) researchers, based on molecular clocks mapping DNA methylation changes (epigenetics) over time in Labrador Retrievers:Human Age = 16 × ln(Dog Age) + 31.

Private & free — this tool runs entirely in your browser.