Steal an Egg · Income

Pet Sizes & Weight

In Steal an Egg, a creature's size is an independent trait from its color mutation, displayed as a weight in kg on the pet card. Size is rolled separately from color at hatch time, which is why the same pet can appear as, for example, a Golden Giant or a plain Huge with no color mutation at all.

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Stacking Mutations and Sizes

A pet's weight has a major effect on final income, since size rolls are easier to obtain than rare color mutations.

Final income is calculated by multiplying the base rate by both the color multiplier and the size multiplier:

Final Income = Base Income × Mutation(s) Multiplier × Size Multiplier

To be more specific, each pet has a hidden base weight that correlates with their base income. Any pet under 125x the base weight is valued using this formula:

Money/s= Base Value (Actual Weight/Base Weight)^37/60 Mutation Multiplier(s)

Once a pet is above 125x the secret base weight, the game begins to apply diminishing returns. The formula is as follows:

Money/s= Base Value Mutation Multiplier(s) (Actual Weight/Base Weight)^2/5 125^13/60

This is a complex way to say that when you hatch an egg 100x base weight, you'll get ~17x base value, at 200x base weight it'll be ~23x and at 1000x base weight it'll be ~45x base value. The bigger eggs still continue to be worth more but the gain per kg becomes smaller and smaller.

Combination examples:

Normal: $100/s (base, no mutation)
Golden + Giant: 100 × 2.5 × 3 = $750/s (x7.5 total)
Rainbow + Huge: 100 × 3.5 × 5 = $1,750/s (x17.5 total)

Size multiplier table

Computed with the formula above for a pet whose base income is $100/s, without mutation. Past 125× the base weight the curve flattens.

Size multiplier by weight ratio
Weight vs. base	Size multiplier	Income of a $100/s pet
×1	×1.00	$100/s
×2	×1.53	$153.33/s
×5	×2.70	$269.79/s
×10	×4.14	$413.68/s
×25	×7.28	$727.89/s
×50	×11.2	$1.12K/s
×100	×17.1	$1.71K/s
×125cap point	×19.6	$1.96K/s
×200	×23.7	$2.37K/s
×500	×34.2	$3.42K/s
×1000	×45.1	$4.51K/s

Mutation multipliers

The color multiplier in the formula. Normal pets count as ×1.

Mutation multipliers
Mutation	Multiplier	How to get it
Rainbow	×3.5	Animated rainbow effect that continuously changes colors. Extremely rare hatch roll — roll weight 1 out of 100.
Parasite	×3	Not obtainable through normal hatch rolls. Comes from its own dedicated Parasite Egg, obtained through the feeding event.
Fractured	×2.75	Not obtainable through normal hatch rolls. Can be applied to an egg with a Mutation Consumable for a 10% chance.
Scrambled	×2.75	Poison like effect. Currently obtainable via Dr. Scramble's Shop — can be applied to an egg with a 10% chance.
Golden	×2.5	Shiny metallic gold texture with coin particles. Roll weight 4 out of 100.
Spirit Bloom	×2.5	Green spiritual effect. Currently unobtainable via normal roll — obtained instead through the Sakura Incubator.
Bloom	×1.25	Cherry blossom petal particles. Likely gated behind the Sakura event rather than normal hatching.
Silver	×1.2	Shiny silver appearance with metallic reflections. Roll weight 6 out of 100.

All mutations →Open the income calculator →

Data sourced from the Steal an Egg Wiki (CC BY-SA) and processed automatically; last synced 2026-10-11.