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Mutations and size multipliers

The highest multiplier is Rainbow (×3.5). Only Rainbow, Golden and Silver come from normal hatching; the rest come from events or items. Size is rolled separately and its multiplier stacks with the mutation.
Data checked: Oct 15, 2026

Mutation multipliers

Mutation Multiplier Hatch chance How to get
Rainbow×3.51% Normal hatch
Parasite×3– Event or item
Fractured×2.75– Event or item
Scrambled×2.75– Event or item
Golden×2.54% Normal hatch
Spirit Bloom×2.5– Event or item
Bloom×1.25– Event or item
Silver×1.26% Normal hatch

Stacking several mutations

One colour variant (Rainbow, Golden, Silver) can combine with the other mutations, and the multipliers add instead of multiplying: 1 + the sum of (each multiplier - 1). Example: Rainbow ×3.5 + Parasite ×3 + Fractured ×2.75 gives ×7.25, not the ×28.88 you would get by multiplying.

Size multiplier by weight

Every pet has a base weight. The multiplier depends on how many times heavier the pet is than that base: ratio^(5/3) below base weight, ratio^(37/60) up to 125×, and ratio^(2/5) × 125^(13/60) above that, so gains shrink as pets get bigger.

Weight vs base Size multiplier With Rainbow
0.25××0.1×0.35
0.5××0.31×1.1
0.75××0.62×2.17
1××1×3.5
2××1.53×5.37
5××2.7×9.44
10××4.14×14.48
25××7.28×25.48
50××11.16×39.06
100××17.11×59.9
125××19.64×68.73
200××23.7×82.95
500××34.19×119.67
1000××45.12×157.91

Try your own numbers in the calculator

Source: Module:IncomeCalculator/Data (rev 2021, Sep 30, 2026), Mutations (rev 1822, Sep 20, 2026), Pets and Eggs (rev 2161, Oct 14, 2026), MediaWiki:Common.js (rev 1790, Sep 20, 2026) · Steal An Egg community wiki, CC BY-SA 3.0. Numbers restructured into tables.