Both calculators convert a dog's age to human years. They use different inputs and describe the method differently. Facts below come from the visible pages.
Disclosure: CalcuPaw makes one of the calculators compared here. We only state what is visible on each page on the date above. Pages change; if something is out of date, tell us and we will correct it.
Side by side
| Feature | CalcuPaw | Omni Calculator (Dog Age Calculator) |
|---|---|---|
| Inputs | Age in years and months, and adult weight (sets the size group) | Breed, age, and a size category: small (20 lb or less), medium (21 to 50 lb), large (over 50 lb) |
| Method | Size chart (15 for year one, 24 for year two, then +4, +5, +6 or +7 a year) shown with the epigenetic formula 16 × ln(age) + 31 | Size-based approach; the page describes the epigenetic formula but does not confirm that the calculator uses it |
| Sources | AAHA (2019) life stages and Wang et al., Cell Systems (2020), linked | Cites the Wang et al. work as a 2019 bioRxiv preprint |
| Maximum age | Up to 20 years | Up to 19 years |
| Extra content | Life-stage guide, senior-stage rule, how to estimate an unknown age | Explainer on how dogs age and the Labrador study |
When Omni Calculator may suit you better
- You want to pick a breed from a list.
- You want the size category stated in pounds on one screen.
When CalcuPaw may suit you better
- You want the chart and the epigenetic result side by side.
- You want to link the age to AAHA life stages and senior timing.
Frequently asked questions
Why do the two calculators give different human ages?
They use different size bands and may differ in how they treat years after the second. Both are approximations, not medical measurements.
Is one dog year seven human years?
No. Dogs age fastest in the first two years, and the pace after that depends on size.
Source for the other tool
Omni Calculator (Dog Age Calculator), read 19 Oct 2026.