Koi Cosmic
Koi earns $12M/s at base. With Rainbow (×3.5) it earns $42M/s, before size.
It ranks #88 of 191 pets by base income and #11 of 29 Cosmic pets.
Data checked: Oct 15, 2026 · Base weight: 120 kg · Egg: Cherry Blossom
Income by mutation
| Mutation | Multiplier | Income | How it appears |
|---|---|---|---|
| None | ×1 | $12M/s | Normal hatch |
| Rainbow | ×3.5 | $42M/s | Hatch roll, 1% chance |
| Parasite | ×3 | $36M/s | Event or item only |
| Fractured | ×2.75 | $33M/s | Event or item only |
| Scrambled | ×2.75 | $33M/s | Event or item only |
| Golden | ×2.5 | $30M/s | Hatch roll, 4% chance |
| Spirit Bloom | ×2.5 | $30M/s | Event or item only |
| Bloom | ×1.25 | $15M/s | Event or item only |
| Silver | ×1.2 | $14.4M/s | Hatch roll, 6% chance |
Income by size
Koi's base weight is 120 kg (community wiki). Heavier pets earn more, with diminishing returns past 125× the base weight; lighter-than-base pets earn less. The table uses the curve from the community wiki calculator.
| Weight | vs base | Size multiplier | No mutation | Rainbow | Golden | Silver |
|---|---|---|---|---|---|---|
| 60 kg | 0.5× | ×0.31 | $3.78M/s | $13.2M/s | $9.45M/s | $4.54M/s |
| 120 kg | 1× | ×1 | $12M/s | $42M/s | $30M/s | $14.4M/s |
| 240 kg | 2× | ×1.53 | $18.4M/s | $64.4M/s | $46M/s | $22.1M/s |
| 600 kg | 5× | ×2.7 | $32.4M/s | $113M/s | $80.9M/s | $38.9M/s |
| 1,200 kg | 10× | ×4.14 | $49.6M/s | $174M/s | $124M/s | $59.6M/s |
| 6,000 kg | 50× | ×11.16 | $134M/s | $469M/s | $335M/s | $161M/s |
| 15,000 kg | 125× | ×19.64 | $236M/s | $825M/s | $589M/s | $283M/s |
| 60,000 kg | 500× | ×34.19 | $410M/s | $1.44B/s | $1.03B/s | $492M/s |
Colour variants and mutations add together rather than multiply: Rainbow (×3.5) plus Parasite (×3) is ×5.5, not ×10.5.
Open Koi in the calculator to try any mutation, size and number of pets.
Closest pets by base income
| Pet | Rarity | Base income | vs Koi |
|---|---|---|---|
| Kraken | Secret | $15M/s | 1.25× |
| Wendigo | Secret | $15M/s | 1.25× |
| Citadel Snail #007 | Cosmic | $12.5M/s | 1.04× |
| Koi | Cosmic | $12M/s | – |
| Stacked Turtle | Cosmic | $12M/s | 1.00× |
| Mantaris | Cosmic | $11M/s | 0.92× |
| Cerberus | Secret | $8M/s | 0.67× |
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.