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. 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 earn only while you are in a server, so the per-day number is a ceiling, not a forecast.
• Server-wide boosts. Event multipliers and the money gamepass scale the total. Type the boosted card value if you want them included.
• Size. A Huge roll raises base income on the card; the tool does not model size separately because the card already includes it.

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.