About Steal An Egg Calculator
This site is a free set of calculators for the Roblox game Steal An Egg: an income calculator, a pet value list with a trade calculator, a speed calculator, plus reference pages for mutations and biomes.
It exists because the numbers floating around for this game disagree with each other. Guides from August 2026 list 78 pets; the game had 184 Pet Index cells by October. Two popular guides say Golden is ×2; the game says ×2.5. We wanted one place where every number says where it came from and whether it was checked in the game.
How the data was checked
- On 2026-10-09 we opened the in-game Pet Index on a fresh account and recorded every cell: rarity, cash reward and speed reward, 184 cells in total, once in English and once in Chinese to catch reading errors.
- The cash reward on a cell is always 100 × the pet's base income. Chicken, the only unlocked pet, earns $1/s and its cell pays $100. Using that rule, 176 wiki pets were matched to cells by tab, rarity and reward. Nineteen had the wrong rarity on the wiki and were corrected.
- One Golden Chicken (61 kg, $9/s) was used to test the Golden multiplier, the size formula and Chicken's base weight. The cash balance was timed over two windows to confirm the per-second payout.
- Shop prices, the pen upgrade sign and the equip-slot price were read from the game on the same day.
Everything else, mainly base weights and mutation multipliers other than Golden, comes from the Fandom wiki and is labelled accordingly.
What the data labels mean
- Verified in-game The pet's rarity and base income were matched against the in-game Pet Index on 2026-10-09. The Pet Index pays a claim reward equal to 100 × the pet's base income per second, so a reward of $100 confirms $1/s. Three pets (Scorpion, Rhinotaur, Glyptodon) show a one-decimal truncated reward in the game, which still agrees with the wiki value. Nineteen pets had their rarity corrected to what the game shows.
- Estimated No source lists the base income. We worked it out from the Pet Index reward (reward ÷ 100) by matching the pet's rarity to the only cell with that rarity. Currently only Celestial Sunlion carries this label.
- Unverified The numbers come from the Steal An Egg Wiki (Fandom) and have not been matched to the in-game Pet Index. This covers 22 pets that have no Pet Index cell (event dragons, Secret Shrine fusions, experiment pets) and the Enchanted Forest pets whose names are still locked.
Labels follow a strict priority: Estimated first, then Unverified, then Verified in-game. Anything still marked "to be confirmed" in our notes can never be shown as verified.
Data sources
Priority when sources disagree: in-game reading, then the Roblox game page, then the Fandom wiki, then dated third-party guides. Numbers that exist on only one low-quality site are not used.
| Source | Used for | Trust |
|---|---|---|
| In-game Pet Index, shop and base (2026-10-09) | Rarity and reward of all 184 cells; shop prices; pen and equip prices; Golden Chicken test | Highest |
| Roblox game page | Game description only; it has no numbers | High, no data |
| Fandom Module:IncomeCalculator/Data (edited 2026-09-30) | Base income and base weight for 191 pets | Medium |
| Fandom Module:Pets/Data (edited 2026-09-30) | Rarity, biome and income for 197 pets | Medium |
| Fandom Mutations and Income Calculator | Mutation multipliers, size formula, variant and mutation groups | Medium (Golden confirmed in-game) |
| Fandom Biomes, Enchanted Forest | Biome order, speed thresholds, guardians | Medium; Enchanted Forest page low |
| Fandom Treadmill, Speed, Boosts, Gamepasses | Treadmill tiers, free speed, Robux multipliers, gamepasses | Medium to medium-low |
| Fandom Updates, Eggs | Event timings, limited egg rules, how mutations are obtained | Medium |
| GameRant Fuse Machine guide (2026-09-23) | Pure Jellyfish readings used to cross-check the size formula; Secret Shrine recipes | Medium |
| timesaver.gg value list (2026-09-26) | Angels & Demons release date and threshold cross-check | Medium |
| beebom (2026-08), games.gg (2026-09-08), stealthygaming (2026-08-21) | Older pet lists and the conflicting mutation set, shown for comparison only | Low to medium-low |
| stealaneggcalcuator.com, axeetech, wikirealm | Checked for conflicts only. Their rebirth costs, fusion estimates, additive stacking and treadmill lists are not used | Low |
Part of the data is compiled from the Steal An Egg Wiki on Fandom, available under the CC BY-SA license. Data set frozen on 2026-10-10.
What this site does not do
- No fusion calculator. The Fuse Machine's cost and output formula are unknown.
- No rebirth calculator. Sources contradict each other on cost, bonus and what is kept.
- No per-pet pages, no accounts, no ads, no tracking scripts.
Contact
Found a number that does not match the game? Email [email protected] with a screenshot of the pet label (name, income, weight) or the Pet Index cell. In-game readings beat every other source here.