Hatch speed
Continuous and periodic effects differ
A percentage reduces the whole base timer. A helper that removes a fixed number of seconds every interval is applied as a discrete cut. Keep those inputs separate.
Hatch planner · reviewed July 30, 2026
Grow a Garden Egg Hatch Calculator: Time, Odds & Cost
Estimate a current egg’s final hatch time, helper reductions, parallel-slot schedule, target pet probability, expected cost, and how many eggs you need for one or multiple copies at 50–99% confidence.
Hatch speed + target odds · current inputs
Egg hatch time, odds, cost and slot calculator
Model one egg timer, flat periodic time skips, parallel slots, and the chance of hatching one or more target pets. Values are editable because egg pools and helper mechanics change between patches.
Effective hatch time / egg
8h
Time saved / egg
0 seconds
Planned slot batches
34
Planned completion time
11d 8h
Planned egg cost
5B
Expected target copies
1
Chance of at least one target
63.4%
Chance of at least 1 target
63.4%
Chance of zero targets
36.6%
Mathematical expected eggs for 1
100
Expected egg cost
5B
Expected slot time
11d 8h
| Target confidence | Eggs needed for at least 1 | Egg cost | Slot completion time |
|---|---|---|---|
| 50% | 69 | 3.45B | 7d 16h |
| 75% | 138 | 6.9B | 15d 8h |
| 90% | 230 | 11.5B | 25d 16h |
| 95% | 299 | 14.95B | 33d 8h |
| 99% | 459 | 22.95B | 51d |
The entered hatch-time reduction is capped at 0%. Periodic time removal is modeled as a discrete cut after each full interval. Slot time assumes each batch starts immediately after the previous identical batch finishes.
Expected eggs are long-run averages, not guarantees. Target confidence uses an independent binomial model with a constant chance per egg. It excludes pity systems, changing egg pools, stock availability, animation or placement delay, server lag, helper targeting conflicts, offline behavior changes, and unequal timers across slots.
Target odds
“Average” does not mean “almost guaranteed”
A 1% target has a 100-egg mathematical expectation, yet the chance of getting at least one within 100 independent eggs is only about 63.4%.
Egg slots
Parallel slots reduce time, not cost
More slots complete identical eggs in fewer batches. They do not change target probability per egg or the number of eggs purchased.
Reproducible probability
How egg hatch odds are calculated
At least one target
For n independent eggs with target chance p, the chance is 1 − (1 − p)^n. The miss-all probability is (1 − p)^n.
Multiple target copies
For two or more desired copies, the calculator uses the binomial probability of obtaining at least k successes in n eggs.
Expected eggs
The negative-binomial mean for k target copies is k ÷ p. It is an average across many runs and has no guarantee deadline.
Confidence thresholds
The tool searches for the smallest whole egg count whose binomial probability reaches each confidence target.
How to measure a hatch setup accurately
1. Record the current egg timer
Use the countdown shown by the exact egg and patch. Convert hours to minutes before entering it: 8 hours is 480 minutes.
2. Separate helper mechanics
Combine continuous percentage reductions only when their stacking rule is known. Sum periodic fixed cuts separately.
3. Copy the current drop chance
Use the target pet probability shown by the same egg pool. Do not mix a pet chance from another event or legacy egg.
4. Use realistic active slots
Enter only slots that can run this same egg setup simultaneously. Different egg timers require separate scenarios.
Data conflict warning
Do not trust an undated egg preset automatically
Public 2026 calculator pages disagree on base hatch times, helper percentages, speed caps, periodic effects, pet limits, and egg pools. Even pages marked “verified” can describe different patches. This tool therefore starts without a speed boost or periodic cut and asks you to enter the current in-game values.
The editable 90% cap is a secondary-source scenario default, not an official universal claim. Change it when your current game evidence supports a different limit.
Inspect the community-maintained Eggs reference ↗Egg hatch calculator FAQ
How many eggs do I need to hatch a target pet?
There is no guaranteed number when each egg is an independent random roll without pity. Enter the current target chance and desired number of copies. The threshold table shows the minimum eggs for 50%, 75%, 90%, 95%, and 99% probability of reaching that target.
Why is expected eggs different from 90% confidence?
Expected eggs is a long-run average. For one target with a 1% chance, the expectation is 100 eggs, but 100 eggs provide only about a 63.4% chance of at least one success. Higher confidence requires more eggs.
How are parallel egg slots calculated?
Planned eggs are divided by active slots and rounded up to complete batches. Each batch is assumed to start immediately after the previous batch and every egg is assumed to have the same effective timer.
Does the calculator include every helper pet automatically?
No. Public pages disagree on helper percentages, caps, targeting, and current egg timers. Enter the combined continuous time reduction and any aggregate periodic seconds removed from your current setup.
Pet Weight & Age
Project the weight of the pet after it hatches.
Open pet weight calculator →Pet Ability Procs
Plan the cooldown and chance-based effect of the pet you obtained.
Open ability calculator →Pet XP Time
Estimate the time needed to level the new pet.
Calculate XP time →Pet Mutation Odds
Keep post-level Mutation Machine odds separate from egg odds.
Calculate mutation odds →