D&D Encounter Challenge Rating Calculator
Estimate the difficulty of a D&D 5e combat encounter by calculating adjusted XP against party thresholds.
Results
What is it?
The D&D 5e encounter builder uses XP thresholds (Easy, Medium, Hard, Deadly) scaled by party level and size. Monster quantity multipliers are applied because action economy ? many weaker monsters acting each round ? is disproportionately dangerous compared to a single powerful monster. A difficulty ratio of 1 = Medium, ~1.5 = Hard, ~2+ = Deadly.
How to use
Enter party size and average level, then the number and CR of monsters. The calculator estimates total adjusted XP and a difficulty ratio. A ratio above 2 indicates a potentially lethal encounter for an average party. Note: CR fractions should be entered as 0.5, 0.25, or 0.125.
Example scenario
Party of 4 at level 5 vs 4 CR 2 monsters (multiplier x2): monsterXP approximately 100 each, totalXP = 4 x 100 x 2 = 800. Medium threshold for a level 5 party of 4 is roughly 500 XP. Difficulty ratio = 800/500 = 1.6 ? a Hard encounter that should challenge but not wipe the party.
Pro tip
The DMG XP system is a rough guide, not gospel. Terrain, conditions, and player tactics matter enormously. A CR 5 monster (1,800 XP) is far more dangerous than five CR 1 monsters (1,000 XP x2 multiplier = 2,000 XP adjusted) due to legendary actions and multiattack. Playtest your encounters ? err toward less deadly until you know your group.