# BDO Enhancement Calculator

> Free BDO enhancement calculator. Enter your failstacks and enhancement level to see the published success chance, expected attempts, and the recommended failstack count.

Enhancing in Black Desert is a math problem wearing a gambling costume. Enter your failstacks and target enhancement level to see your real success chance and whether your stack is big enough.

*Interactive tool: enter your values at https://toollantern.win/bdo-enhancement-calculator/ and results update instantly in your browser.*

## The published enhancement formula

For Sovereign weapons, the published formula is: chance = base chance + failstacks x (base chance / 10), capped at the table's softcap value. Each failstack adds 10% of the base chance. TRI to TET, for example, starts at 0.91% and gains 0.091% per failstack, capping at 10.01% on 100 failstacks. TET to PEN starts at 0.469% and caps at 7.504% on 150 failstacks.

## What the optimizer tells you

The recommended stack is the published softcap for the level: the point where the table stops rewarding more failstacks. Below it, every stack you add raises your chance; at or above it, you are capped and should spend the stack on a harder attempt instead. Expected attempts = 100 / chance percent.

## Worked example

Enhancing to **PEN (V)** with **100 failstacks**: chance = 0.469 + 100 x 0.0469 = **5.159%**. Expected attempts = 100 / 5.159 = **19.4**. Recommended = **150**, so you still need **50** more failstacks to hit the softcap.

## Failstack discipline

Never tap a PEN attempt on a 20 stack, and never waste a 200 stack on a TRI attempt. Build stacks on cheap gear, spend them at the recommended counts, and let the math, not the tilt, decide when to click enhance.

## Frequently asked questions
### How do failstacks change enhancement chance?

Chance = base + failstacks x (base / 10), capped at the softcap. For example TRI to TET: 0.91% base, +0.091% per stack, capped at 10.01% on 100 stacks.

### What are the recommended failstack counts?

PRI 60, DUO 75, TRI 90, TET 100, PEN 150, HEX 210, SEP 240, OCT 270, NOV and DEC 300. These are the published softcap counts for Sovereign weapons.

### Should I keep stacking past the recommended count?

No. Past the softcap the published table caps the chance, so extra stacks add nothing. Save high stacks for harder attempts instead of overstacking an easy one.

### Does failing make the next attempt more likely?

No, enhancing has no memory: every attempt rolls the same chance. Failing ten TET attempts in a row does not make the eleventh any more likely, which is exactly why the expected-attempts number matters.

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Interactive version: https://toollantern.win/bdo-enhancement-calculator/