MythicalS
Koi — Value & Calculator
Signature Ability: Koi is a mythical-tier pet in Grow a Garden.
Tokens @ 1kg
16
Hatch wt
4.5 kg
Max wt
65 kg
Tier
S
Verification & Sources
- Verified by
- GAG Calc Team
- Last update
- Koi data source
- Verified datapoints
- Cross-source verified
- 3 sources
- Formula accuracy
- ±2%
- Methodology
- Read
Calculate Koi value
Signature Ability: Koi is a mythical-tier pet in Grow a Garden.
Trade value scales with weight only — community calculators (game.guide, tradekitsune, growagardencalculator) all ignore age.
Auto-fill weight from age (optional)
1.00×
Trade Tokens
16
@ 4.50 kg
Datapoints (verified)
Koi tokens at key weights
No mutation, no demand bonus. Use the calculator above for custom inputs.
At hatch
16
tokens
4.5 kg · just hatched
Mid-weight
90
tokens
~34.8 kg · typical reference
At max
213
tokens
65 kg · fully grown
3 datapoints cross-verified from community trade data (game.guide, growagardencalculator, tradekitsune). Values between datapoints use simple linear interpolation (matches industry standard). See methodology.
Koi value-by-weight curve
3 datapoints · linear interpolation. Markers show exact value at each weight.
Value curve Verified datapoint Hatch weight
Recent Koi updates
value$3.2M→ $3.5M
+9%tierS→ S+
value$3.1M→ $3.2M
+3%value$3.4M→ $3.1M
-8%Full changelog: /changelog
Koi tokens by mutation (weight 46.8 kg)
| Mutation | Mult | Mutation Machine % | Tokens | Gain vs none |
|---|---|---|---|---|
| None (baseline) | 1× | — | 136 | — |
| Ascended | 5× | 0.32% | 678 | +543 |
| Rainbow | 2.5× | 3.22% | 339 | +204 |
| Radiant | 1.6× | 3.22% | 217 | +81 |
| Shocked | 1.6× | 3.22% | 217 | +81 |
| Golden | 1.5× | 6.43% | 204 | +68 |
| Tiny | 1.4× | 6.43% | 190 | +54 |
| Mega | 1.4× | 6.43% | 190 | +54 |
| Inverted | 1.3× | 16.08% | 176 | +41 |
| IronSkin | 1.25× | 3.22% | 170 | +34 |
| Shiny | 1.15× | 32.15% | 156 | +20 |
| Windy | 1.1× | 9.65% | 149 | +14 |
| Frozen | 1.1× | 9.65% | 149 | +14 |
💡 Best mutation = Ascended (5×) but only 0.32% from Mutation Machine. Rainbow (2.5×, 3.22%) often the better practical target.
Koi weight by age
Predicted weight (kg) at each age milestone, from hatch weight 4.5 kg.
| Age | Weight | Multiplier |
|---|---|---|
| Age 1 | 4.50 kg | ×1.00 |
| Age 5 | 6.14 kg | ×1.36 |
| Age 10 | 8.18 kg | ×1.82 |
| Age 25 | 14.32 kg | ×3.18 |
| Age 50 | 24.55 kg | ×5.45 |
| Age 75 | 34.77 kg | ×7.73 |
| Age 100 | 45.00 kg | ×10.00 |
| Age 125 | 55.23 kg | ×12.27 |
How to get Koi
Koi comes from Pet Shop.
To maximize your odds: stack hatch helpers (use the egg hatch calculator), then level your pet with XP planner.
Trading Koi
Always check the WFL Calculator before trading. Pet trade value is sensitive to weight, age and mutation — a fresh-hatched Koi is worth far less than a max-age, Rainbow-mutated one.
FAQ
What is Koi in Grow a Garden?
Koi is a Mythical-tier pet from Pet Shop. Its ability "Signature Ability" — Koi is a mythical-tier pet in Grow a Garden.
What is Koi's base trade value?
Around 16 Trade Tokens at hatch weight (4.5 kg), no mutation. Heavier pets fetch much more — up to 213 tokens at max weight (65 kg).
How do I get Koi?
Source: Pet Shop.
What is Koi's max weight?
65 kg.
Related pets & alternatives
Similar Mythical pets
Step up to Divine
Cheaper alternatives (Legendary)
Sources: Koi data is cross-verified against the Grow a Garden Fandom Wiki, community trade submissions sent to [email protected], and in-game testing by the GAG Calc team. See our methodology for the verification pipeline.