D&D encounter difficulty calculator

Under the 2014 rules you total the monsters’ XP, multiply it by a factor that grows with how many monsters there are, and compare the result against four thresholds — easy, medium, hard and deadly — summed across the party. The multiplier is the part people get wrong by hand, which is why it is shown in the result rather than hidden inside it.

The 2024 rules removed the multiplier entirely. You total the monsters’ XP and compare it against three budgets — low, moderate and high. The designers folded the crowd effect into the budget numbers themselves, so a straight sum is now the correct calculation rather than a shortcut.

That means the same encounter can land in different places depending on which edition you are running, and neither answer is wrong. Use the toggle to match your table.

Take a party of four 3rd-level characters against four CR 1 monsters. Raw XP is 4 × 200 = 800. Under the 2014 method, four monsters puts you at the ×2 step of the multiplier ladder (three to six monsters), so adjusted XP is 1,600. A 3rd-level party’s summed thresholds are 300 / 600 / 900 / 1,600 — and 1,600 lands exactly on deadly. Under the 2024 method there is no multiplier: the same 800 raw XP is compared against summed budgets of 600 / 900 / 1,600, and 800 clears only the first of those — low. Same fight, same party, same monsters: deadly under one edition’s maths and low under the other’s. Neither number is wrong; they are answering different questions, which is the whole reason the toggle exists.

Second example: three 5th-level characters plus one 3rd-level character against a single CR 1 monster (200 XP). Thresholds are summed per character, not averaged — three 5th-level easy thresholds (250 each) plus one 3rd-level easy threshold (75) gives 825, not something in between 5th and 3rd level. 200 XP does not clear that, so the fight is trivial for this party — a useful check on the instinct to eyeball a "one monster vs a four-person party" fight as automatically fine: it usually is, but the summed threshold is what actually says so, and it says so by a wide margin here.

Two monsters of half the strength are harder than one of full strength, because they get twice the actions. The 2014 multiplier is how that is priced in: ×1 for a single monster, ×1.5 for two, ×2 for three to six, ×2.5 for seven to ten, ×3 for eleven to fourteen and ×4 for fifteen or more.

Party size shifts it. A party of fewer than three characters moves one step up the ladder, and a party of six or more moves one step down — six players get more actions of their own, so a crowd threatens them less.

One thing worth knowing: the multiplier only exists to classify difficulty. XP awarded to the party after the fight always uses the raw total, never the adjusted one.

Difficulty bands are a starting point, not a verdict. They do not know that your party has no healer, that the fight happens in a corridor where only two characters can reach the front, or that the wizard still has a fireball and the encounter is six goblins standing in a circle.

They also assume a party at full resources. A "medium" encounter as the fourth fight of a day with no short rests behaves like a hard one, and the 2014 guidance of six to eight medium-to-hard encounters per adventuring day is doing a lot of quiet work behind these numbers.

Treat "deadly" as "someone could die if this goes badly", not "someone will". It is the band that most rewards knowing your own table.

Averaging party level instead of summing thresholds. A party of three 5th-levels and one 3rd-level is not "roughly 4th level" for this purpose — see the worked example above. Each character contributes its own threshold, added together.

Treating the adjusted XP as the reward. The multiplier exists only to classify difficulty; the party is paid the raw total, split evenly, regardless of how many monsters delivered it.

Ignoring legendary and lair actions. The calculator prices a monster by its CR-derived XP, which does not know whether that monster gets an extra turn between everyone else’s. A CR-appropriate solo boss with legendary actions plays harder than its number here suggests — treat "deadly" for a legendary monster as a floor, not a ceiling.

Assuming the party’s saves match the monster’s attacks. XP-based difficulty has no idea whether the party has a weak Wisdom save and the monster only attacks Wisdom. A "medium" encounter built entirely around a save the party is bad at plays like a much harder one, and there is no number this tool — or the DMG method it implements — can put on that.

Running it as the fourth fight of the day with no rest and expecting a "medium" result to still mean medium. The 2014 guidance of six to eight medium-to-hard fights per adventuring day assumes resource attrition across the day; a single encounter’s rating says nothing about what the party has left by the time they reach it.