Lost Ark Ability Stone Calculator
Enter your current faceting state to get an optimal next click recommendation and your total chance to finish with your target engraving outcome.
Model assumes standard faceting odds: success chance starts where you set it, then moves down by 10% on success and up by 10% on failure (clamped between 25% and 75%).
What this ability stone calculator does
This tool is an ability stone calculator for Lost Ark faceting. It uses dynamic programming to evaluate every possible future path and then tells you which line to click next: Positive Engraving 1, Positive Engraving 2, or the Negative line.
Instead of guessing based on intuition alone, the calculator computes your best choice by maximizing the total probability of finishing with your goal distribution.
How the calculator models faceting
Inputs you provide
- Current successes and remaining slots for all three lines
- Current success chance (25% to 75%)
- Target minimum for each positive engraving
- Target maximum for negative engraving
Optimization goal
The algorithm maximizes your final probability of meeting this condition: Positive 1 ≥ target, Positive 2 ≥ target, Negative ≤ max allowed.
For each possible next click, it calculates:
- Chance of success on that click
- Chance of failure on that click
- Updated success-rate state (up/down by 10%)
- Best possible play from that new state onward
How to use it in a real run
Step-by-step
- Enter your live stone values after each click.
- Set your desired end target (example: 7/7 with max 4 negative).
- Click Calculate Best Next Click.
- Follow the recommended line, then update values and repeat.
Practical strategy tips
Use high odds for value
At 65% or 75%, the calculator usually favors a positive line unless one positive is already secure and the other is the only remaining priority.
Dump low odds into the negative line when possible
At 25% or 35%, failing is more likely, so these are often the best times to spend attempts on the negative row— especially when your negative limit still has room.
Respect breakpoints, not just raw totals
A stone at 6/8 is not always better than 7/7 for your build goals. This calculator focuses on whether your final distribution actually satisfies the target profile you entered.
Common target presets players use
- 7/7, max 4 negative — classic high-value faceting target
- 9/7, max 4 negative — premium/high-roll target
- 6/6, max 5 negative — practical early/mid progression
FAQ
Does this guarantee I hit the stone?
No. It increases decision quality and expected results, but RNG still decides outcomes.
Why can the recommendation change every click?
Because your state changes every click: remaining slots, current odds, and target distance all shift continuously.
Can I use this as an engraving planner?
Yes. It pairs well with any engraving planner because it outputs the chance of achieving a concrete stone profile.