Question 1

Is 1 dog year equal to 7 human years?

Accepted Answer

No. The '7 dog years' rule is an oversimplification. Dogs age rapidly in their first two years and then slow down. A modern logarithmic formula (published in Cell Systems, 2019) gives a much more accurate estimate based on DNA methylation patterns.

Question 2

How do I calculate the age of my dog?

Accepted Answer

Enter your dog's age in years and select their size category (small, medium, large, or giant). Our calculator uses a logarithmic formula with size-based adjustments to give you the human-equivalent age.

Question 3

What is the new formula for dog years?

Accepted Answer

Researchers at UC San Diego developed the formula: Human Age = 16 × ln(dog age) + 31. This is adjusted by dog size in our calculator since larger breeds age faster than smaller ones.

Question 4

How old is an 11 year old dog in human years?

Accepted Answer

Using the logarithmic formula, an 11-year-old medium dog is approximately 65 human years. A large dog of the same age is closer to 68, and a small dog closer to 62.

Question 5

Is a 10 year old dog considered old?

Accepted Answer

Yes — a 10-year-old dog is considered senior. In human years, that's roughly 60–66 depending on size. Large and giant breeds are considered senior at 7–8 years; smaller breeds at 10–12 years.

Dog Years	Small	Medium	Large	Giant
1 yr	28	31	34	37
2 yrs	39	42	45	48
3 yrs	46	49	52	55
4 yrs	50	53	56	59
5 yrs	54	57	60	63
6 yrs	57	60	63	66
7 yrs	59	62	65	68
8 yrs	61	64	67	70
9 yrs	63	66	69	72
10 yrs	65	68	71	74
11 yrs	66	69	72	75
12 yrs	68	71	74	77
13 yrs	69	72	75	78
14 yrs	70	73	76	79
15 yrs	71	74	77	80
16 yrs	72	75	78	81
17 yrs	73	76	79	82
18 yrs	74	77	80	83
19 yrs	75	78	81	84
20 yrs	76	79	82	85

Dog Age Calculator

Dog years calculator · How old is my dog in human years · Dog age chart

Dog Age Chart — Years 1–20

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