Dog Age Calculator
CalculationConvert your dog's age to human years with a size-aware formula for small, medium and large breeds. Free and private; everything runs in your browser.
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Common formula: first year ≈15, second +9, then +4–5 per year depending on size.
What is a Dog Age Calculator?
A Dog Age Calculator converts your dog's age in years into an approximate human age using a modern, size-aware formula. Small, medium and large breeds age at different rates, so the tool lets you pick the right size before estimating.
How is the age estimated?
The common formula counts the first year as about 15 human years, the second year as another 9, and then adds 4 to 5 human years per year depending on size. A 3-year-old medium dog therefore equals ≈15 + 9 + 4 = 28 human years.
Is my data safe?
Yes. The estimate is calculated entirely in your browser; the age and size you enter are never sent or stored. Free, no signup and completely client-side.
Frequently Asked Questions
What is Dog Age Calculator?
Estimates a dog's age in human years using its age and breed size.
How do I use Dog Age Calculator?
Type or paste your data into the field on this page and press the button. The result is calculated instantly in your browser — nothing is uploaded.
Is Dog Age Calculator free?
Yes, Dog Age Calculator is completely free. No signup, no downloads and no usage limits.
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