Cluster Jewel Odds & Cost Calculator
Use this Path of Exile cluster jewel calculator to estimate your chance of rolling useful notables and your expected currency cost. This model assumes each notable on the base has equal chance and rolls are sampled without replacement.
What this cluster jewel calculator does
If you craft cluster jewels regularly, you already know the pain: one base can burn a pile of currency before showing even one useful notable. This calculator gives you quick planning numbers so you can answer practical questions before you start rolling:
- What is my chance to hit at least one of my target notables?
- What is my chance to hit two good notables in the same roll?
- How many attempts should I budget for 80%, 90%, or 95% confidence?
- What does that mean in chaos-equivalent currency cost?
How the math works
This tool uses a hypergeometric model. In plain language: you have a pool of possible notables, some are good for your build, and each roll draws a fixed number of notables without replacement. The calculator computes the chance of drawing at least your required count of good outcomes in one attempt, then converts that into expected attempts and expected cost.
Inputs explained
- Total possible notables: Count of all notables available on your chosen cluster jewel base.
- Desirable notables: How many from that pool you would accept.
- Notables rolled per jewel: How many notable slots you are effectively evaluating for your craft path.
- Minimum desired required: Your keeper threshold (e.g., 1 for “usable”, 2 for “premium”).
- Cost per roll: Average spend per attempt in chaos-equivalent value.
- Target confidence: Probability of seeing at least one success after repeated attempts.
Example scenario
Suppose your large cluster base has 12 possible notables, and only 3 are build-relevant. You roll 2 notables and require at least 2 desired notables (a true double-hit). The chance is low because both pulls must land from a small target set. That’s exactly where many players underestimate cost.
With the calculator, you can immediately compare two crafting plans:
- Strict plan: keep only double-hit jewels (high quality, high variance, high cost).
- Flexible plan: keep single-hit jewels and finish through trade or recombination (lower variance, lower cost).
Practical crafting strategy tips
1) Set a hard budget before rolling
Use the “rolls for target confidence” output as your cap. If your budget only supports a 60–70% success chance, that’s fine—just make that explicit before you click your first orb.
2) Re-check expected value after market moves
Cluster jewel prices and currency ratios shift during a league. If your expected craft cost is now higher than buying finished jewels, skip crafting and purchase directly.
3) Separate “playable now” vs “best-in-slot”
Early league, a one-notable success can unlock your build power quickly. Late league, you can tighten your filter to double-hit or premium combinations. The calculator supports both styles by adjusting “minimum desired required.”
Important limitations
This cluster jewel calculator is intentionally fast and transparent, but it is still a simplified model. Real Path of Exile crafting can involve:
- Mod weighting differences
- Item level constraints
- Fossil/tag interactions
- Additional affix goals beyond notables
For deep optimization, combine these outputs with current trade prices and known mod-weight resources. Even so, this tool is excellent for quick budgeting, decision-making, and avoiding low-probability trap crafts.
Bottom line
Good crafting is not just luck—it’s probability management. Run your numbers first, pick a realistic confidence target, and treat each attempt as part of a planned process. Over time, this discipline saves more currency than any single lucky roll.