How are expected attempts calculated?

Each level follows a geometric distribution, so the average number of attempts is one divided by that level's success rate. A 25% rate averages 4 attempts, and a 5% rate averages 20.

Why does the rate drop as the level climbs?

Most games make higher enchants progressively harder. The tool reduces the success rate by a fixed amount per level until it hits your floor, mirroring that increasing difficulty curve.

Does this assume the item is destroyed on failure?

No. It models the retry case where a failed attempt costs materials but does not destroy or downgrade the item. If your game destroys items, the real cost is higher and you should add a buffer.

What is the success floor for?

The floor stops the rate from reaching zero at very high levels, where games usually keep a small guaranteed chance. Setting a floor of 5% means no enchant step is ever harder than a 1-in-20 average.

Why is the total cost so high for top enchants?

Because expected attempts compound across every step and the per-step rate keeps falling, the final few levels dominate the total. Budget the most for the last couple of enchant levels.

Apex Legends Enchant & Gear Score Calculator

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Pushing gear to a high enchant is a probability sink, and it is easy to underestimate the cost. This calculator projects the average attempts and total materials to go from your current enchant level to your target, using a success rate that decays as the enchant climbs.

How it works

Each enchant step succeeds with a rate that starts at your base and drops by a fixed amount per level until it hits a floor. Each level follows a geometric distribution, so the expected attempts and cost are:

s(level)        = max(floor, base − decay × (level − 1))
expectedAttempts = 1 / s(level)
expectedCost     = costPerAttempt / s(level)

The totals sum these across every level from your current to your target.

Example and tips

Starting at 90% with an 8% drop per level and a 5% floor, early enchants take barely more than one attempt, but by the time the rate hits the floor each step averages twenty tries. Because cost compounds, the last two or three enchant levels usually account for most of the bill, so stockpile materials before you attempt them and consider whether a protection item is worth buying for the highest steps.