Dog Years Calculator

Convert dog years to human years by size with the vet age chart and the new DNA formula. Free online dog age calculator with life stage for any breed size.

Dog's age — yearsMonths

Size (adult weight)

Full dog age chart

Dog age	Small	Medium	Large	Giant
1	15	15	15	12
2	24	24	24	22
3	28	28	28	31
4	32	32	32	38
5	36	36	36	45
6	40	42	45	49
7	44	47	50	56
8	48	51	55	64
9	52	56	61	71
10	56	60	66	79
11	60	65	72	86
12	64	69	77	93
13	68	74	82	100
14	72	78	88	107
15	76	83	93	114
16	80	87	99	121

Loading…

Free, no sign-up, works in the browser — send it to a friend or add it to your site.

Cat Years CalculatorConvert cat years to human years with the vet age formula and AAFP/ICatCare life stage. Free online cat age calculator, indoor vs outdoor lifespan.
Puppy Weight CalculatorEstimate how big your puppy will get with this free online puppy weight calculator — enter age, current weight and breed size to predict adult weight.
Body Fat CalculatorCalculate your body fat percentage online free with the U.S. Navy tape method in cm or inches. Free online body fat calculator with lean mass and ACE chart.
Dew Point CalculatorCalculate the dew point from temperature and humidity with this free online dew point calculator. Also find relative humidity and how humid it feels.
Dog Food CalculatorCalculate how much to feed your dog with this free online dog food calculator. Uses weight, life stage and food calories to give cups or grams per day.
One Rep Max CalculatorCalculate your one rep max (1RM) from any set with this free online one rep max calculator — 7 formulas averaged, plus a 50–100% training weight table.

How to use Dog Years Calculator

1Enter your dog's age in years and months
2Pick the size by adult weight — small, medium, large or giant
3Press Calculate to see the age in human years, the life stage and the DNA-based estimate, then open the full chart

Frequently asked questions

Is one dog year really seven human years?▾

No. The 1:7 rule is a myth. Dogs mature very fast: a one-year-old dog is roughly a 15-year-old human and a two-year-old about 24. After that each year adds about 4 to 7 human years depending on size.

How old is my dog in human years?▾

Using the vet chart, a 5-year-old dog is about 36 (45 for giant breeds), a 10-year-old small dog about 56, a medium dog about 60, a large dog about 66 and a giant breed about 79 in human years.

Why do big dogs age faster?▾

Large and giant breeds have shorter lifespans, so after about age five they age faster than small dogs. A 10-year-old Great Dane is much older in human terms than a 10-year-old Chihuahua.

What is the DNA methylation dog age formula?▾

A 2020 study (Wang et al., Cell Systems) compared DNA methylation in Labradors and humans and proposed human age = 16 × ln(dog age) + 31. It suggests dogs age very fast early on — a 1-year-old dog is about 31.

When is a dog considered a senior?▾

Vets usually call a dog senior in the last quarter of its expected lifespan: around 10–11 for small dogs, 9 for medium, 8 for large and 6–7 for giant breeds.

Embed Dog Years Calculator on your website▾

Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.

<iframe src="https://clkr.work/embed/dog-years-calculator" title="Dog Years Calculator by clkr.work" width="100%" height="640" style="border:0;border-radius:12px;max-width:720px" loading="lazy" allow="clipboard-write" referrerpolicy="strict-origin-when-cross-origin"></iframe>

Dog age	Small	Medium	Large	Giant
1	15	15	15	12
2	24	24	24	22
3	28	28	28	31
4	32	32	32	38
5	36	36	36	45
6	40	42	45	49
7	44	47	50	56
8	48	51	55	64
9	52	56	61	71
10	56	60	66	79
11	60	65	72	86
12	64	69	77	93
13	68	74	82	100
14	72	78	88	107
15	76	83	93	114
16	80	87	99	121

Dog age	Small	Medium	Large	Giant
1	15	15	15	12
2	24	24	24	22
3	28	28	28	31
4	32	32	32	38
5	36	36	36	45
6	40	42	45	49
7	44	47	50	56
8	48	51	55	64
9	52	56	61	71
10	56	60	66	79
11	60	65	72	86
12	64	69	77	93
13	68	74	82	100
14	72	78	88	107
15	76	83	93	114
16	80	87	99	121

Dog age	Small	Medium	Large	Giant
1	15	15	15	12
2	24	24	24	22
3	28	28	28	31
4	32	32	32	38
5	36	36	36	45
6	40	42	45	49
7	44	47	50	56
8	48	51	55	64
9	52	56	61	71
10	56	60	66	79
11	60	65	72	86
12	64	69	77	93
13	68	74	82	100
14	72	78	88	107
15	76	83	93	114
16	80	87	99	121

Dog age	Small	Medium	Large	Giant
1	15	15	15	12
2	24	24	24	22
3	28	28	28	31
4	32	32	32	38
5	36	36	36	45
6	40	42	45	49
7	44	47	50	56
8	48	51	55	64
9	52	56	61	71
10	56	60	66	79
11	60	65	72	86
12	64	69	77	93
13	68	74	82	100
14	72	78	88	107
15	76	83	93	114
16	80	87	99	121

Found it useful? Share Dog Years Calculator

Related tools

How to use Dog Years Calculator

Frequently asked questions

Dog age	Small	Medium	Large	Giant
1	15	15	15	12
2	24	24	24	22
3	28	28	28	31
4	32	32	32	38
5	36	36	36	45
6	40	42	45	49
7	44	47	50	56
8	48	51	55	64
9	52	56	61	71
10	56	60	66	79
11	60	65	72	86
12	64	69	77	93
13	68	74	82	100
14	72	78	88	107
15	76	83	93	114
16	80	87	99	121

Dog age	Small	Medium	Large	Giant
1	15	15	15	12
2	24	24	24	22
3	28	28	28	31
4	32	32	32	38
5	36	36	36	45
6	40	42	45	49
7	44	47	50	56
8	48	51	55	64
9	52	56	61	71
10	56	60	66	79
11	60	65	72	86
12	64	69	77	93
13	68	74	82	100
14	72	78	88	107
15	76	83	93	114
16	80	87	99	121