Corn Snake morph calculator
Choose the genes each parent carries and see the full clutch odds — per gene and per combination. Covers 22 curated corn snake genes, with the allelic, lethal and sex-linked cases handled properly.
Sire (male)
Which genes the father carries, and in what form.
No genes yet — this parent is treated as a normal animal.
Dam (female)
Which genes the mother carries. Sex matters only for sex-linked genes.
No genes yet — this parent is treated as a normal animal.
Add at least one gene to a parent to see the predicted offspring.
What to watch for in corn snake pairings
Two allelic pairs are the exception to the simplicity. Amelanistic and Ultra sit at the same locus, so an animal carrying one of each is an Ultramel — a compound het that looks like its own morph rather than a carrier. Motley and Stripe are allelic in the same way. This is the friendliest place in herpetoculture to understand what an allelic series actually is.
- Amelanistic and Ultra; Motley and Stripe — allelic, so they share a locus and cannot be inherited independently or stacked as separate supers.
Go deeper
The species page lists every curated corn snake gene with its mode of inheritance, super form and flags, alongside breeding and incubation notes.
Common questions
Is the corn snake morph calculator free?
Yes. No account, no sign-up, and no limit on how many pairings you try. Everything runs in your browser and nothing is stored.
What is an Ultramel corn snake, genetically?
An Ultramel carries one Amelanistic allele and one Ultra allele. Because the two sit at the same locus, the animal has no wild-type copy and shows an intermediate appearance — it is a compound het, not a het for either gene alone.
Is Snow a corn snake gene?
No. Snow is the combination of two recessive genes, Amelanistic and Anerythristic, in the same animal. HerpSync stores the two genes and derives the combination name, which is why the calculator can predict Snow from parents that are not themselves Snow.
Run this against your own corn snakes
Record genotypes on each animal and every prediction comes from real records — with pedigrees, inbreeding coefficients and what each clutch actually produced.
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