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Probability Calculator
Pick a base, choose target mods, and see the chance of hitting them with a chosen currency. Math runs in a web worker so the page stays responsive.
Result
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Select a base, target mods, and hit Calculate.
⚠️ <strong>Heads up:</strong> no per-base weights detected for this item. Results use the slot-wide DropChance values scraped from poe2db's ModsView, falling back to a tier-based pseudo-weight when even those are missing. For per-base accuracy, drop community weights into {weightsfile}.
How It Works
Pick a base item and target mods, then hit Calculate to see the probability of landing at least one of them with a single currency use. The calculator builds a weighted pool from GGG's published drop weights and runs exact combinatorial math or Monte Carlo simulation inside a web worker so the page stays responsive.
Example Walkthrough
- 1. Select Diamond (Jewels) as the base
- 2. Set ilvl to 80
- 3. Choose Regal Orb (Magic to Rare, +1 affix) as the operation
- 4. Search for critical in the mod search box, check a couple of mods
- 5. Click Calculate to see the odds of hitting at least one of them
Try a different operation like Alchemy (4 affixes) and see how the odds change.
Exact method computes probability via combinations (fast, accurate for small pools). Monte Carlo simulates 100,000 random rolls (better for complex scenarios with many target mods).