1. 01

    Pick one goal

    Choose a cash target or your next zone milestone. Observe what slows you down, then read the current upgrade descriptions for a matching improvement.

  2. 02

    Measure your income

    Record starting cash, ending cash, and elapsed minutes. Repeat with the same activity and duration, avoiding purchases and one-time rewards. Keep a range if results vary.

  3. 03

    Compare before buying

    Enter the current price and your cash rates in the calculator. Treat an untested future rate as an estimate. Check both payback and time to your target, including any wait to afford the purchase.

Ready to compare?

Open upgrade calculator ↗

Formulas & source notes

Cash/minute = cash gained ÷ elapsed minutes. Payback minutes = price ÷ positive increase in cash/minute. A zero or negative increase has no finite payback.

These estimates assume steady earnings. They exclude changing boosts, unlock requirements, and reset effects. Speed alone does not establish extra cash income.

The official listing confirms training, clones, eggs, and pet income; no fixed upgrade prices or optimal order are verified here. Checked 2026-10-02. Sources ↗

Game basics · Rebirth checklist