Income Calculator: Pen Earnings & Time to Target - Steal An Egg

How much does my Pen earn?

Add one row per pet, type its income per second, choose its mutation and how many copies you have equipped. The totals update as you type, and the target box tells you how long until you can afford the next Pen level, treadmill upgrade or trail.

What is the formula?

Nothing hidden. For each row:

effective $/s = base $/s × (1 + (mutation − 1)) × copies

The Pen total is the sum of all rows, then × 2 if you tick the X2 MONEY! pass and × the server or event boost you enter. Per minute, hour and day are that total × 60, × 3,600 and × 86,400. Time to target is (target − coins now) ÷ total $/s.

Mutation multipliers come from the mutations guide: Rainbow 3.5, Parasite 3, Fractured 2.75, Spirit Bloom 2.5, Golden 2, Bloom 1.25, Silver 1.2. If the game’s card already shows the mutated value, leave the mutation on None — otherwise you would count it twice.

What does the calculator not know?

• Time offline. Pets keep earning offline, but at a much lower, unpublished rate, so the per-day number is a ceiling, not a forecast.
• How boosts stack. The tool applies the pass and the boost one after the other. The game does not publish its stacking order, so compare with your in-game total the first time.
• Size. A heavier roll raises income on the card, which already includes it. To estimate another copy’s income from its weight, use the estimator below.

What would a heavier copy earn?

Bigger copies of the same pet earn more, but not in a straight line. Enter a copy you own and the weight of another copy to estimate what it would make.

other copy $/s = your copy $/s × (other kg ÷ your kg) ^ (1.85 ÷ 3)

Doubling a pet’s weight raises its income by about 53%, not 100%. The curve comes from a third-party breakdown of the game’s configuration and is not confirmed by the developers, so treat it as an estimate and trust the card once you have the pet.

How do I use the result?

Use the time-to-target to decide between spending now or waiting. If your next Speed gate is hours away but a Pen upgrade is minutes away, buy the Pen level first — more slots means more $/s, which shortens every later wait. To check whether a new egg deserves a slot at all, run the Pen slot optimizer.