Call of Cthulhu 7e Roll resolution cheat sheet
A 1-page summary of how to resolve rolls. At-the-table reference for Call of Cthulhu 7th Edition.
Call of Cthulhu resolves everything with d100 roll-under: succeed by rolling at or under your skill rating, with difficulty tiers for harder tasks.
Core mechanic
- Roll
- d100 (two d10s: tens + units)
- Regular success
- Roll ≤ skill value
- Hard success
- Roll ≤ skill ÷ 2 (round down)
- Extreme success
- Roll ≤ skill ÷ 5 (round down)
- Critical
- Roll 01
- Fumble
- 96-100 if skill < 50; 100 if skill ≥ 50
At-the-table steps
- GM names the skill and difficulty level (Regular, Hard, or Extreme).
- Roll d100 and compare to the threshold.
- Opposed rolls: both sides roll; higher success level wins.
- Pushing a roll: fail once, describe how you try harder, roll again with worse consequences on failure.
Bonus and penalty dice
- Bonus die: roll an extra tens die and keep the lower (better) tens digit.
- Penalty die: roll an extra tens die and keep the higher (worse) tens digit.
- Multiple bonus/penalty dice cancel each other 1:1.
Common mistakes
- Hard and Extreme thresholds round down: skill 55 has Hard 27 and Extreme 11.
- Pushing a roll means worse consequences on failure, not a free re-roll.
- A roll of 100 is always a fumble, regardless of skill level.