Pet Weight Calculator
Enter a hatch weight — or a current weight and age — to see your pet’s size class and how heavy it will be at every age up to 100.
Values last checked: (Grow a Garden 1 data)
| Age | kg |
|---|---|
| 1 | 3 |
| 10 | 5.45 |
| 25 | 9.55 |
| 50 | 16.36 |
| 75 | 23.18 |
| 100 | 30 |
How to use it
- Choose whether you know the hatch weight or the current weight and age.
- Enter the numbers from your pet’s card.
- Read the size class, the weight now and the weight at age 100.
Pet size classes by hatch weight
A pet’s size class is fixed the moment it hatches and never changes, even as it grows. The class comes from its hatch weight:
| Size class | Hatch weight | Weight at age 100 |
|---|---|---|
| Small | under 1 kg | 5.0 kg + |
| Normal | 1–1.99 kg | 10.0 kg + |
| Large | 2–2.99 kg | 20.0 kg + |
| Semi Huge | 3–4.99 kg | 30.0 kg + |
| Huge | 5–6.99 kg | 50.0 kg + |
| Semi Titanic | 7–7.99 kg | 70.0 kg + |
| Titanic | 8–8.99 kg | 80.0 kg + |
| Godly | 9–9.99 kg | 90.0 kg + |
| Colossal | 10 kg + | 100.0 kg + |
The age-100 column uses the lower bound of each class (0.5 kg for Small).
How pets grow with age
Pets gain about one eleventh of their hatch weight every age. The formula is weight = hatch weight × (age + 10) ÷ 11, so at age 100 a pet weighs ten times its hatch weight. A 3 kg Semi Huge pet reaches about 30 kg; a 10 kg Colossal reaches about 100 kg.
Because growth is linear, you can also work backwards: current weight × 11 ÷ (age + 10) gives the hatch weight. Choose “Current weight and age” above to do it automatically.
Frequently asked questions
How much do pets grow in Grow a Garden?
A pet gains about one eleventh of its hatch weight per age. At age 100 it weighs roughly 10 times its hatch weight.
What decides a pet’s size class?
Hatch weight: under 1 kg is Small, 5 kg is Huge, 8 kg is Titanic, 9 kg is Godly and 10 kg or more is Colossal.
Can I work out hatch weight from current weight?
Yes. Choose “Current weight and age” and the calculator reverses the growth formula.