About Ragdoll Calculator

Ragdoll Calculator was built for breeders who want a clear answer to a simple question: what can this pairing actually produce? Punnett squares work, but doing five or six loci by hand — plus X-linked red and stacked white spotting — is slow and easy to get wrong.

The calculator does that maths in one pass. Enter what you know from DNA results, leave the rest as unknown, and it returns every possible kitten outcome with its probability, split by sex so tortie girls are shown correctly, along with a cartoon preview of each result.

It runs entirely in your browser. Nothing you enter about your cats is stored or sent anywhere.

A note on accuracy

Predictions are probabilities, not guarantees, and they're only as good as the genotypes you put in. Confirm carrier status through DNA testing before making breeding decisions, and talk to your vet or a genetics-savvy mentor about health testing alongside color.