Leopard Gecko morph calculator
Choose the genes each parent carries and see the full clutch odds — per gene and per combination. Covers 19 curated leopard gecko 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 leopard gecko pairings
The trap here is the albinos. Tremper, Bell and Rainwater are three separate, non-allelic recessive genes — a Tremper albino bred to a Bell albino produces normal-looking babies that are het for both, not albinos. Breeders lose whole seasons to that one fact. The snow genes are likewise distinct rather than interchangeable.
- 9 polygenic traits are excluded from the picker entirely, because no honest percentage can be given for a line-bred trait.
Go deeper
The species page lists every curated leopard gecko gene with its mode of inheritance, super form and flags, alongside breeding and incubation notes.
Common questions
Is the leopard gecko 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.
Can I breed a Tremper albino to a Bell albino?
You can, but you will not get albinos. Tremper, Bell and Rainwater are three separate recessive genes at different loci, so the babies inherit one copy of each and look normal while carrying both. Crossing the lines is generally discouraged because the resulting animals are difficult to sell honestly.
Why isn't Tangerine in the calculator's odds?
Tangerine is polygenic — the colour is produced by many genes together and intensified by selective breeding, so there is no single gene to inherit and no percentage to calculate. HerpSync records it on the animal so you can track it down a line, and says plainly that it cannot be predicted.
Run this against your own leopard geckos
Record genotypes on each animal and every prediction comes from real records — with pedigrees, inbreeding coefficients and what each clutch actually produced.
Get started free