The calculator

1. How big is your dog as an adult?

2. How old is your dog?

Years

Months

Your dog in human years

Your dog is about

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The chart behind it

There is no single scientific formula for “dog years”. The old “multiply by seven” rule is a myth: dogs grow up very fast in their first two years, and after that, smaller dogs tend to age more slowly than bigger ones. This calculator uses the size-based chart that is commonly shared by pet organizations, and fills in the months between the whole years. Treat it as a fun estimate, not a measure of your own dog’s health.

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

Whatever the number says, every life stage has its own rhythm. Puppies need short, frequent sessions and lots of sleep (the puppy sleep planner helps there); teenage dogs often seem to “forget everything” for a while (see teenage dog regression); and older dogs often enjoy shorter, sniffier walks (see shorter walks for senior dogs and what changes as dogs age).

Your first chapter, free

Calm on the Leash is our book for calmer walks and calmer days with your dog. The first chapter is free to read, so you can see if the approach fits your dog.

Read the first chapter free More free tools

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