Does this converter use the multiply-by-seven rule?

No. It uses modern veterinary methods instead of the outdated multiply-by-seven rule.

How are dog sizes used in the AVMA method?

Dogs are grouped as small, medium, large, or giant because size affects the age increments after the first two years.

How is a cat’s age converted?

The AVMA option uses the standard 15-9-4 rule: 15 human years for year one, 24 for year two, and four additional years per year afterward.

What is the UCSD epigenetic method?

It applies human_age = 16·ln(dog_age) + 31 and is calibrated only on Labradors.

Are the results medical advice?

No. The age equivalents are approximate veterinary guidance and are not medical advice.

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Pet Age Converter

Convert a dog or cat's age into human-equivalent years using the modern AVMA method (with breed-size grouping for dogs) or the UCSD epigenetic formula, and see the pet's life-stage milestone plus a printable vet-visit summary card.

Details

What this tool helps you do

A pet age converter that replaces the outdated "multiply by 7" myth with the modern veterinary method. For dogs it uses the AVMA-endorsed Chewy vet-reviewed table: year 1 = 15 human years, year 2 = 24, then size-dependent increments (small dogs age slowest, giant dogs fastest), with four size bands. For cats it uses the standard 15-9-4 rule. An optional UCSD 2020 epigenetic mode applies humanage = 16·ln(dogage) + 31 (calibrated only on Labradors). The tool also classifies the pet into its AAHA/AAFP life stage and emits a printable vet-visit summary card. Age-equivalents are approximate veterinary guidance, not medical advice.

Execution

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Prepared example runs

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2 examples

5-year-old medium dog → AVMA human-equivalent

A 5-year-old medium-sized dog converted with the AVMA method. Year 1 = 15, year 2 = 24, then the medium-band increments give a 37-year human-equivalent, classified as a mature adult. Includes a cross-size comparison showing small (36) vs giant (42) at the same age.

<section><h2>37 human-equivalent years</h2><div class="stage-badge">Mature adult</div></section>

10-year-old cat → 15-9-4 rule human-equivalent

A 10-year-old cat converted with the standard 15-9-4 rule (year 1 = 15, year 2 = 24, +4/year after), giving 56 human-equivalent years and classified as a senior per the 2021 AAHA/AAFP feline life-stage guidelines.

<section><h2>56 human-equivalent years</h2><div class="stage-badge">Senior</div></section>

Inputs

Set the required fields, then run the tool.

5 options

SettingsAdjust formats, ranges, numbers, and modes.5

Pet age (years)numberRequiredPet typeselectRequiredDog size (for dogs only)selectOptionalConversion methodselectRequiredDecimal placesnumberOptional

Result

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Samples

Pet Age Converter

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Key facts

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Use cases

Examples

1. Five-year-old medium dog with the AVMA method

2. Ten-year-old cat with the 15-9-4 rule

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3. Labrador comparison with the UCSD method