How is the expected number of attempts per level calculated?

For a success rate p at a given level, each attempt is independent, so the expected number of attempts to succeed once is 1 divided by p. The tool adds this across every level from your current to your target.

Does a failed enchant lower my level?

This model assumes a failed attempt simply consumes resources without dropping the level, which is the most common no-downgrade system. If your game downgrades on failure, the real cost will be higher than shown.

How is total cost computed?

For each level the cost equals the per-attempt material cost multiplied by the expected attempts for that level. The grand total is the sum across all levels on your upgrade path.

Why do later levels cost so much more?

Success rates usually fall at higher levels, so the expected attempts climb steeply. A 20% success means five attempts on average, and a 10% success doubles that to ten attempts per level.

Is the expected cost a guarantee?

No. It is a statistical average. Because each attempt is random, your real total can be much higher or lower; budget extra for variance, especially at low success rates.

Stardew Valley Enchant & Gear Score Calculator

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Plan Stardew Valley enchant upgrades before you spend

High-level enchants can drain your resources fast because success rates fall as the level climbs. This calculator models the per-level success rate and cost, then sums the expected attempts and total resources to reach your target — so you can budget realistically instead of gambling blind.

How it works

Each upgrade level has a success rate p. Since attempts are independent, the expected number of attempts to succeed once at that level is:

expected attempts = 1 / p

The expected cost for that level is expected attempts × per-attempt material cost. To go from your current level to your target, the tool sums the expected attempts and costs across every level in between:

total cost = Σ (cost_level × 1 / p_level)

This assumes a no-downgrade system where a failure consumes resources but does not lower the level.

Tips and example

If level 5 has a 25% success at 200 materials per try, you expect 4 attempts and 800 materials for that single level. Stacking several such levels adds up quickly, and because the values are averages, variance at low success rates is harsh. Always keep a buffer beyond the expected total, and if your game downgrades on failure, treat these numbers as an optimistic floor.