Free D&D / TTRPG combat pacing predictor. Enter players, character level, monster count, and player decision speed; outputs estimated rounds, real-world minutes, and a schedule warning ("don't start near end of session").
Use before designing the climactic fight of a session — knowing the duration helps you pace narrative beats around it.
Encounter difficulty calculators (Kobold+) tell you "is it deadly?" but not "is it long?". This is the time-budget companion.
Per-turn time = 60 s + level × 10 s, multiplied by the decision-speed selector.
Round estimate is bounded between 2 and 8: more monsters extend the fight, higher level shortens it (better burst damage).
Total = (players + monsters) × rounds × per-turn. Most 5e fights land between 30 and 60 minutes.
Tuned for D&D 5e-style combat but useful for any d20 system. Adjust the decision-speed selector for faster systems (Blades in the Dark, PbtA).
No — only duration. Combine with your system's encounter-budget calculator for difficulty.
Most table time is spent deciding actions rather than rolling dice, so slow or indecisive players can double the real-world minutes for the same number of rounds. Groups that plan turns in advance finish combats far faster.
Each extra monster adds its own turn, initiative slot, and set of attacks to resolve every round, so total time grows with both monster count and round count. A handful of weak enemies can take longer to run than one tough boss.
Invoer
4 players, level 3, 4 monsters, average decision speed.
Uitvoer
4 rounds, ~70 s/turn, ~37 min total.
8 combatants × 4 rounds × 70 sec = 2,240 s ≈ 37 min. Add narration overhead for a real ~45-min fight.
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