Dog Age Calculator By Breed
without the guesswork.
Dog Age To Human Years — Choose from 143 breed cohorts to estimate life stage, senior threshold and a human-age range, with a mixed-breed weight fallback. Uses a focused calculator with visible assumptions. Inputs stay in your browser.
Labrador Retriever is used to estimate life stage. The human-age range is a secondary educational comparison, not a health forecast.
Context matters.
- Breed-cohort values come from a large UK companion-dog study; geography, health, lifestyle and individual variation can change outcomes.
- Median survival is a population statistic, not a prediction of an individual dog's lifespan.
- Use your veterinarian's assessment for health, screening and senior-care decisions.
Sources & scope
This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.
What to know before using the result.
Does breed change a dog's age estimate?
Breed affects the lifespan profile and the point at which the final 25% of estimated life begins. CalcSpan uses breed-cohort data when available and clearly labels fallbacks.
What should I choose for a mixed-breed dog?
Choose Mixed / unknown and enter expected adult weight. The result will be labeled as a weight-based fallback rather than a breed-cohort match.
Is the human-age result exact?
No. Human-age equivalents are educational comparisons, so CalcSpan shows a range and makes the AAHA life stage the primary result.