---
title: "Dog Years to Human Years Calculator (UK) & Age Chart | Dog Years"
description: "Free dog years to human years calculator and chart for UK owners. How old is your dog in human years? Size-adjusted Royal Kennel Club guidance, by month."
image: "https://dogyears.info/result-image.png?t=Guess%20your%20dog%27s%20true%20age&s=Real%20breed-adjusted%20human%20years%2C%20not%20the%20old%20%C3%977%20rule&v=2"
url: "https://dogyears.info/"
---

# Dog Years to Human Years Calculator

A UK tool using Royal Kennel Club size-adjusted guidance — not the old ×7 rule. [About](https://dogyears.info/about)

Enter your dog's name, age and breed to see their age in human years.

- 225+ RKC breeds
- 4 sizes weight bands
- Free no signup needed

This page includes an interactive dog years calculator: https://dogyears.info/.

## Dog years to human years chart

This chart converts dog years to human years for ages 1 to 16, by size. The figures are the same ones the calculator uses for a whole number of years: The Royal Kennel Club’s size-adjusted guidance, as tabulated by Purina UK. Small is under 9 kg, medium is 9–23 kg, large is 23–41 kg, and giant is over 41 kg. For part of a year, or a named breed, use the calculator above.

| Dog’s 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](https://dogyears.info/10-dog-years-in-human-years) | 56 | 60 | 66 | 79 |
| [11](https://dogyears.info/11-dog-years-in-human-years) | 60 | 65 | 72 | 86 |
| [12](https://dogyears.info/12-dog-years-in-human-years) | 64 | 69 | 77 | 93 |
| [13](https://dogyears.info/13-dog-years-in-human-years) | 68 | 74 | 82 | 100 |
| [14](https://dogyears.info/14-dog-years-in-human-years) | 72 | 78 | 88 | 107 |
| [15](https://dogyears.info/15-dog-years-in-human-years) | 76 | 83 | 93 | 114 |
| [16](https://dogyears.info/16-dog-years-in-human-years) | 80 | 87 | 99 | 121 |

Source: The Royal Kennel Club (dog-years-to-human-years guidance, as published via Purina UK). Figures are estimates. Individual dogs vary with genetics, health and lifestyle. Not a substitute for veterinary advice. Large and giant dogs are generally treated as senior from 5 years, medium dogs from 7, and small dogs from 10.

By age: [10 dog years](https://dogyears.info/10-dog-years-in-human-years) · [11 dog years](https://dogyears.info/11-dog-years-in-human-years) · [12 dog years](https://dogyears.info/12-dog-years-in-human-years) · [13 dog years](https://dogyears.info/13-dog-years-in-human-years) · [14 dog years](https://dogyears.info/14-dog-years-in-human-years) · [15 dog years](https://dogyears.info/15-dog-years-in-human-years) · [16 dog years](https://dogyears.info/16-dog-years-in-human-years).

## How this is calculated

The breed lookup maps each Royal Kennel Club-recognised breed to its official size band (Small, Medium, Large or Giant). The size-adjusted method then follows The Royal Kennel Club's own guidance: the first two years of a dog's life are roughly 24 human years for small, medium and large breeds (around 15 for year one, then 9 more), or about 22 for giant breeds. After that, each further dog year adds roughly 4 more human years for small breeds, rising to around 7 for giant breeds — reflecting that larger breeds mature and age faster. The older "1 dog year = 7 human years" rule is a 1950s rule of thumb that doesn't hold up scientifically, but is included here for comparison. Figures are estimates — individual dogs vary with genetics, health and lifestyle. Not a substitute for veterinary advice.

## Guides

- [Fresh Dog Food vs Kibble for Senior Dogs](https://dogyears.info/fresh-dog-food-vs-kibble-for-senior-dogs): US guide: labels, raw food, and what to ask your vet
- [Pet Insurance for Older Dogs in the US](https://dogyears.info/pet-insurance-for-older-dogs-us): Reimbursement, age limits, and how US policies differ
- [Flea and Tick Prevention in the US](https://dogyears.info/flea-and-tick-prevention-for-dogs-us): Regional ticks, Lyme disease, and product types
- [Pet Insurance for Older Dogs](https://dogyears.info/pet-insurance-for-older-dogs): UK guide: lifetime cover, excess, and pre-existing conditions
- [Flea, Tick and Worm Treatment](https://dogyears.info/flea-tick-worm-treatment-for-dogs): UK guide, for dogs of every age
- [Caring for an Ageing Dog](https://dogyears.info/caring-for-an-ageing-dog-uk-guide): A UK owner's practical guide

[All guides](https://dogyears.info/guides)

## Frequently asked questions

### What are dog years?

A dog's age in years is simply how long it has been alive — the same as it would be for a human. "Human years" is the equivalent age you get once that real age is translated using ageing guidance such as The Royal Kennel Club's, because dogs mature and age at a different pace to humans, especially early in life.

### How do you convert dog years to human years?

According to The Royal Kennel Club, the first two years of a small, medium or large dog's life are roughly 24 human years (about 15 for year one, then 9 more), while giant breeds reach around 22 human years by age two. After that, each additional dog year adds a size-dependent number of human years — roughly 4 for small breeds, rising to around 7 for giant breeds. The older "1 dog year = 7 human years" rule is simpler but far less accurate.

### Is the dog years x7 rule real?

No — the x7 rule is a 1950s rule of thumb, not based on science. Dog ageing isn't linear: a dog reaches near-adult size and the human equivalent of a teenager within its first year alone, then ageing slows considerably.

### How many human years is 1 dog year?

It depends on the dog's age and size. In the first year alone, most dogs reach the human-equivalent of about 15 years old (around 12 for giant breeds). After that, ageing continues at a size-dependent pace of roughly 4 to 7 additional human years per dog year, according to The Royal Kennel Club.

```json
{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What are dog years?","acceptedAnswer":{"@type":"Answer","text":"A dog's age in years is simply how long it has been alive — the same as it would be for a human. \"Human years\" is the equivalent age you get once that real age is translated using ageing guidance such as The Royal Kennel Club's, because dogs mature and age at a different pace to humans, especially early in life."}},{"@type":"Question","name":"How do you convert dog years to human years?","acceptedAnswer":{"@type":"Answer","text":"According to The Royal Kennel Club, the first two years of a small, medium or large dog's life are roughly 24 human years (about 15 for year one, then 9 more), while giant breeds reach around 22 human years by age two. After that, each additional dog year adds a size-dependent number of human years — roughly 4 for small breeds, rising to around 7 for giant breeds. The older \"1 dog year = 7 human years\" rule is simpler but far less accurate."}},{"@type":"Question","name":"Is the dog years x7 rule real?","acceptedAnswer":{"@type":"Answer","text":"No — the x7 rule is a 1950s rule of thumb, not based on science. Dog ageing isn't linear: a dog reaches near-adult size and the human equivalent of a teenager within its first year alone, then ageing slows considerably."}},{"@type":"Question","name":"How many human years is 1 dog year?","acceptedAnswer":{"@type":"Answer","text":"It depends on the dog's age and size. In the first year alone, most dogs reach the human-equivalent of about 15 years old (around 12 for giant breeds). After that, ageing continues at a size-dependent pace of roughly 4 to 7 additional human years per dog year, according to The Royal Kennel Club."}}]}
```