Steal an Egg calculator: income per second for any pet, mutation and size

Base income is the pet's listed $/s for a normal-size, un-mutated hatch. Mutation multipliers are the seven from the wiki: Rainbow ×3.5, Parasite ×3, Fractured ×2.75, Golden ×2.5, Spirit Bloom ×2.5, Bloom ×1.25, Silver ×1.2, plus 'none' at ×1. Size can be entered three ways: as the Giant (×3) or Huge (×5) presets implied by the wiki's worked examples, as any multiplier you type, or as a weight ratio — actual weight divided by the pet's base weight — which the tool converts with the wiki's formula: ratio to the power of 37/60 up to 125×, and ratio to the power of 2/5 times 125 to the power of 13/60 above that.

The wiki's own checkpoints for the ratio mode are 100× ≈ 17×, 200× ≈ 23× and 1,000× ≈ 45×; the tool reproduces those.

It does not know any pet's base weight, because the wiki does not publish them; the ratio mode needs you to estimate the ratio yourself from the kilograms on your card and a normal-size card of the same pet. It does not know hatch chances, because none are published. It does not include the 2x Money game pass — multiply the result by two yourself if you own it. And it treats the wiki's loosely written incomes ('$M/s' for Bladehide, '3B/s' for Nightflame) as best it can; Bladehide is listed at zero here because the wiki gives no figure.

Rift and event pets are included with their listed incomes even though they cannot be found in nests.

The Mutations page gives three examples for a $100/s pet: Normal $100/s; Golden + Giant = 100 × 2.5 × 3 = $750/s; Rainbow + Huge = 100 × 3.5 × 5 = $1,750/s. Enter any pet, set Golden and Giant, and the tool should show 7.5× its base; Rainbow and Huge, 17.5×.

The card in your pen shows the pet's name, its mutation label if any, a weight in kilograms and a $/s figure. If the $/s on the card is higher than the tool's result for the same mutation, the difference is the size roll — divide the card's income by the tool's result to get the size multiplier the game applied, and you have a rough sense of how big your hatch was relative to normal. That back-calculation is the closest anyone outside the developer can get to the hidden base weight.

The wiki explains that below 125 times base weight the game rewards weight almost linearly on a log scale (exponent 37/60), and above it switches to a gentler exponent (2/5) with a constant that keeps the curve continuous. The practical meaning is in the wiki's phrasing: bigger eggs still continue to be worth more, but the gain per kilogram becomes smaller and smaller. Combine that with the Eggs page's note that bigger eggs slow you down, and the sweet spot for a contested nest is a large egg you can still outrun the guardian with — not the largest one there.

All seven multipliers from the wiki's Mutations page, with how each is obtained, so you can pick the right one for the pet on your card.

A reference table for the pets most people are deciding about, normal size. Base incomes from the infoboxes; products ours.

The wiki says each pet has a hidden base weight that correlates with its base income, and gives the formula in terms of the ratio between the actual weight and that base. Since the base weight is not published, ratio mode asks you for the ratio directly. A workable estimate: compare the kilograms on your pet's card with the kilograms on a normal-size card of the same species (yours or another player's) and divide. Enter that number, and the tool applies ratio^(37/60) up to 125 and ratio^(2/5) × 125^(13/60) beyond, matching the wiki's checkpoints of roughly 17× at 100, 23× at 200 and 45× at 1,000.

Three reasons, in order of likelihood. The size roll: the card includes it, the tool only includes what you told it. The 2x Money pass: tick the box. A wiki infobox that is out of date: each pet page shows the revision date we read; if the game has changed a base income since, the tool is behind until the data is rebuilt. If none of those explains it, the contact page is the place to send the screenshot.

The tool contains no hatch chances, no base weights and no values, because the register contains none. Its 128 base incomes derive from the Steal An Egg Wiki (CC BY-SA 3.0) and are shared under the same licence; the formula and multipliers are the wiki's; the interface and arithmetic are ours. It runs entirely in your browser and sends nothing anywhere.

The pets people compare most are each zone's fast Cosmic against its slow Eternal. The tool makes that comparison in two clicks; here it is pre-computed for a Golden roll at normal size, so you can see the shape before you open the tool.

The tool prints income the way the wiki writes it — K, M, B, T suffixes with up to two decimals — so a result can be compared against a pet card at a glance. Inputs accept decimals for the multiplier and any positive number for the ratio. Nothing is rounded before the multiplication; only the display is.

Both are Abyss Ocean eggs. Beluga Whale lists $850K/s and grows in 12 minutes; Kraken lists $15M/s and grows in 2 hours 15 minutes. Set Beluga Whale, Golden, normal size: $2.125M/s. Set Kraken, none, normal size: $15M/s. On income the Kraken wins by seven times. On a full server the question is different: in the 135 minutes the Kraken sits exposed, the Beluga pen could have hatched eleven times, and any one of those hatches could roll Golden. The calculator gives you the income comparison; the grow-time column on the pets hub gives you the exposure; the decision is yours, and it changes with how many other players are on the server.

The pet list is generated from the wiki by scripts/build-pets-data.py; re-running it after the wiki changes updates every base income and the calculator together. The date each pet's data was read is shown on its page, and the site's editorial process page explains the schedule.