When is My Dog the Same "Age" as Me?

Plug in the dates below to see when your life arcs were, or will be in sync

Calculator

Your birthday

Enter a full date (YYYY between 1900–2026).

Dog’s birthday

Enter a full date (YYYY between 1990–2026).

Dog size (affects expected lifespan & curve)

Enter both birthdays to calculate.

Show model details

Human model: expected lifespan 79y, curve exponent β=1.
Dog model (size=medium): expected lifespan 13y, curve exponent β=0.58.

Stage index is: stage = clamp01((age / expectedLifespan)^β). We solve for the closest date where human stage equals dog stage.

Is: a lifespan-relative, nonlinear “biological stage” estimate.
Isn’t: a claim that dogs experience time faster, or that “1 dog year = X human years.”
Assumptions: expected lifespan varies a lot by breed, health, and care; this is a useful approximation, not a truth claim.