Problem → workflow → tool
Rolling dice online in Call of Cthulhu 7th Edition
Use a system-accurate roller so results match the game’s mechanics. Use the links below to apply the workflow in Call of Cthulhu 7th Edition and keep it consistent across sessions.
Workflow (do this first)
- State the problem in one sentence (what is stuck?).
- Pick the fastest consistent mechanic to resolve it (DV/DC/band/difficulty).
- Make stakes explicit (success changes what, failure costs what).
- Resolve once, then apply a consequence that moves the scene forward.
Call of Cthulhu uses percentile skills: roll d100 and succeed if you roll at or under your skill. Difficulty often shifts the threshold (Regular/Hard/Extreme) and Sanity loss is a core pressure loop.
Copyable facts
- Percentile skill system: Roll d100, succeed if equal to or below skill rating
- 8 Characteristics: STR, CON, POW, DEX, APP, SIZ, INT, EDU
- Occupation system: Each occupation grants skill bonuses and Credit Rating range
- Sanity mechanics: Starts at 99-POW, decreases with Mythos encounters
- Skill improvement: Mark skills during play, improve after sessions
- Derived stats: HP, Sanity, MP, Build, Damage Bonus calculated from Characteristics
Common mistakes (smallest fix)
- Mistake: rolling repeatedly until you get the answer you want. Fix: one roll should change the situation; if you need another attempt, change position/resources first.
- Mistake: unclear stakes. Fix: state what success gives and what failure costs before the roll.
Context (system overview)
Call of Cthulhu 7th Edition is a horror investigation roleplaying game based on H.P. Lovecraft's Cthulhu Mythos. Players take on the roles of Investigators, ordinary people who uncover cosmic horrors beyond human comprehension. As you investigate mysteries, your character's Sanity slowly erodes, skills improve through use, and the line between reality and madness blurs.