How do you compare two pets fairly?
Compare the displayed rate under the same boosts, then compare the cost and the improvement over what you already own. A fair comparison has one date, one condition set and one stated goal. If either side is missing a value, mark it unknown rather than filling it from a different pet.
This is a decision method, not a tier list. It does not claim that one pet is globally best. A pet with a higher gross rate can still be a worse purchase if its cost is much higher or if it replaces a pet that already earns well.
Build a comparison row
State the decision in one sentence
For example: 'Should I replace my current pet with this one if I play for ten minutes a day?' A clear goal determines which numbers matter and which can be ignored.
Record both rates in one session
Open both pets under the same boost and copy the displayed values. If a boost affects one but not the other, the comparison is not like for like.
Record the full cost of changing
Include the acquisition or upgrade cost and anything else you must give up. If the cost is unknown, stop and mark it unknown; a payback estimate without a cost is incomplete.
Calculate gross and incremental payback
Use the calculator for the new pet's full cost and rate, then for the extra cost and the rate difference. Compare the two results with the goal from step one.
Comparison worksheet
| Target | Field | Pet A (current) | Pet B (candidate) | Note |
|---|---|---|---|---|
| Cost to change | Cost to change | Already owned | Displayed cost | Mark unknown if absent |
| Displayed rate | Displayed rate | $/s | $/s | Same boost required |
| Incremental payback | Incremental payback | — | Extra cost ÷ delta | Seconds at a constant rate |
| Label | Label | Your current label | Candidate label | Copy exact wording |
| Rate difference | Rate difference | Baseline | B minus A | Used for incremental payback |
How do you compute replacement payback?
Subtract the current rate from the candidate rate to get the improvement. Subtract the value of the current pet from the candidate's cost to get the extra cost, if the game charges a difference. Then divide the extra cost by the improvement.
For a hypothetical example, a candidate costs 2,500 and displays $8/s, while the current pet displays $5/s and is already owned. The improvement is $3/s and the extra cost is 2,500, so incremental payback is about 833 seconds, or roughly 14 minutes of constant earning. That is arithmetic from invented inputs, not a Fake an Egg value.
If the game does not charge a difference and the old pet has no resale value, use the full cost instead and say so. The label on the result should match the method; otherwise a gross payback can look better than the actual decision.
When keeping the current pet is the better decision
- The improvement is small relative to the cost.
- The candidate's rate was recorded under a boost you cannot sustain.
- The cost is unknown or depends on a requirement you have not met.
- You are still learning the route and cannot use the extra income reliably.
- The candidate would replace a pet whose value is not captured by the displayed rate.
Run the numbers
Open the income calculator
Enter both scenarios and keep the assumptions in the URL.
Calculate paybackRead the income method
Understand gross versus incremental payback before comparing.
Open the income guideSee the ranking criteria
Check what a defensible pet ranking would need.
Read the ranking methodPet comparison questions
Should I compare gross or incremental payback?
Use incremental payback when you are replacing a pet that already earns. It measures the return on the extra spend. Gross payback is easier to calculate but can make an expensive replacement look better than it is.
What if one pet's rate is unknown?
Stop the comparison and mark the field unknown. A payback estimate needs both the cost and the rate. Filling a missing rate from another pet or a video would create a conclusion the evidence does not support.
Does a higher rate always mean a better pet?
No. Cost, boost duration, replacement value and how reliably you can earn all affect the decision. A higher rate can still be a poor purchase if the extra cost is large or the boost is temporary.
Sources and evidence boundaries
- Fake an Egg — official Roblox experience
The public experience description identifies Fake an Egg by Slime Time Studios and its egg-disguise and pet-stealing premise. It does not supply a pet database, current codes, hatch odds, income multipliers or a carrying-speed formula.
Accessed - Fake an Egg — Mr Red Dangerous
Actual introductory gameplay frames reviewed on 2026-10-17 show Bunny Egg at 0:10, Bunny and RAINBOW Cat at 1:00, and Chicken Egg variants at 2:40. Bunny displays $3/s in that session; Cat income is obscured. Capture date, active boosts, current base rates, mutation multipliers and hatch odds are not established.
Accessed