Grow a Garden Pet Calculator —
Hatch Weight, Age & XP Tool
By GardenCalc Team · Last Updated: · ⚡ Verified current GAG patch
Pet Weight Calculator
Selecting a breed auto-fills the typical base weight — you can edit it.
Found in the egg description in-game
Age 0 = maximum weight. Each day ≈ −9%
Formula: Wh = (11 × Wb) ÷ (A + 10) · Verified in-game · Data synced: May 2026
Pet Weight Calculator
No other grow a garden kg calculator displays this formula. Most return a number with no explanation — a black box that gives you no insight into why a pet hatched at age 8 weighs 40% less than the same breed hatched at age 0. The formula makes that relationship transparent.
A Jandel egg with base weight 4 kg hatched at age 0 produces hatch weight of (11 × 4) ÷ (0 + 10) = 44 ÷ 10 = 4.4 kg. The same egg hatched at age 12 produces (11 × 4) ÷ (12 + 10) = 44 ÷ 22 = 2.0 kg. Two hatches of the same egg. One Giant at 4.4 kg. One Average at 2.0 kg. The difference in trade value is significant — and it came entirely from when you chose to hatch.
How to Calculate Pet Hatch Weight in Grow a Garden
- Find your egg's base weight — listed in the egg description in Grow a Garden
- Note the pet's current in-game age in days
- Multiply base weight by 11
- Divide by (age + 10)
- Result is hatch weight in kg — compare to 9 kg Super Giant threshold
Table 1: Hatch Weight by Age — Formula Applied to Common Base Weights
| Age at Hatch | 3 kg Base | 5 kg Base | 8 kg Base | 10 kg Base | Size Tier (8 kg) |
|---|---|---|---|---|---|
| Age 0 | 3.30 kg | 5.50 kg | 8.80 kg | 11.00 kg ✦ Super Giant | Giant |
| Age 1 | 3.00 kg | 5.00 kg | 8.00 kg | 10.00 kg | Giant |
| Age 2 | 2.75 kg | 4.58 kg | 7.33 kg | 9.17 kg | Giant |
| Age 3 | 2.54 kg | 4.23 kg | 6.77 kg | 8.46 kg | Giant |
| Age 5 | 2.20 kg | 3.67 kg | 5.87 kg | 7.33 kg | Giant |
| Age 10 | 1.65 kg | 2.75 kg | 4.40 kg | 5.50 kg | Large |
| Age 20 | 1.05 kg | 1.75 kg | 2.80 kg | 3.50 kg | Average |
Formula: Wh = (11 × Wb) ÷ (A + 10) · Super Giant threshold: above 9 kg · Universal formula — same for all GAG breeds · Last Updated:
Super Giant — The 9 kg Threshold
One number every serious GAG trader needs to know: a Super Giant pet (above 9 kg hatch weight) commands 300 to 500 percent more Sheckles than the same pet at average weight. That premium is not arbitrary — it comes directly out of The GAG Pet Hatch Weight Formula.
Pet Size Tiers in Grow a Garden
Individual Pet Guides
Jandel
Most traded S-Tier pet. 19,000 monthly searches. Super Giant above 9 kg = 300–500% premium.
Jandel Guide →Raiju
S-Tier with comparable value to Jandel per weight tier. 8,400 searches/month.
Raiju Guide →Kitsune
Only pet with Harmonized Foxfire Chakra (190×) — highest individual trade value in the game.
Kitsune Guide →Albino Tarantula
40–80% premium over standard Tarantula. Super Giant overlaps lower S-Tier values.
Albino Tarantula Guide →Firefly Axolotl
Bioluminescent variant. 30–60% above standard Axolotl. Distinct collector segment.
Firefly Axolotl Guide →Frequently Asked Questions
How do I calculate pet hatch weight in Grow a Garden?
Use The GAG Pet Hatch Weight Formula: Wh = (11 × Wb) ÷ (A + 10). Multiply your egg's base weight by 11, then divide by age at hatching plus 10. Age 0 gives maximum weight. Each additional day reduces hatch weight by approximately 9 percent.
What is the Super Giant threshold in Grow a Garden?
Super Giant is any pet with hatch weight above 9 kilograms. It is the highest standard size tier and commands 300 to 500 percent more Sheckles than the same breed at average weight. The 9 kg threshold applies to every pet breed identically.
Does age affect pet value in Grow a Garden?
Age affects hatch weight — and hatch weight determines value. A pet hatched at age 0 achieves maximum weight (110 percent of base weight). Each additional day reduces weight by approximately 9 percent. A pet hatched at age 10 weighs roughly 40 percent less than the same egg at age 0. Always hatch at age 0 when base weight is near the 9 kg Super Giant threshold.
What is the difference between Giant and Super Giant?
Giant is any pet between 5 and 9 kg hatch weight. Super Giant is any pet above 9 kg. Super Giant commands 300 to 500 percent more Sheckles than average weight — Giant commands less. The single kilogram gap around the 9 kg threshold is the most consequential weight boundary in GAG pet trading.
Which pets are S-Tier in Grow a Garden?
The three S-Tier pets in Grow a Garden are Jandel, Raiju, and Kitsune. S-Tier indicates the highest baseline Sheckle value and trading demand. Kitsune is unique among the three — it has access to the Harmonized Foxfire Chakra mutation at 190×, the highest single-type pet mutation in the game.
What is the Grow a Garden pet calculator formula?
The Grow a Garden pet calculator uses The GAG Pet Hatch Weight Formula: Wh = (11 × Wb) ÷ (A + 10). Wh is the hatch weight result in kilograms. Wb is the egg's base weight. A is the pet's age in days at the moment of hatching. The calculator above runs this formula instantly for any breed, base weight, and age combination.