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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)

  1. Pick the roller that matches the system, pool, percentile, exploding d6, 2d12 Hope/Fear, etc.
  2. Set difficulty / DV / target before pressing roll, not after.
  3. Apply modifiers inside the roll, not as re-rolls or after-the-fact tweaks.
  4. Save the roll to history so the table can audit crits and botches later.
Roll loop reminder (Call of Cthulhu 7th Edition)

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.

Example: Spot Hidden 55%: a roll of 42 succeeds; a harder threshold would require a lower roll.

Key facts

  • Percentile skill system: Roll d100, succeed if equal to or below skill rating
  • 8 Characteristics: STR, CON, POW, DEX, APP, SIZ, INT, EDU (plus Luck)
  • Occupation system: Each occupation grants skill bonuses and Credit Rating range
  • Sanity mechanics: Starts at POW, maximum reduced by Cthulhu Mythos exposure
  • Skill improvement: Mark skills during play, improve after sessions
  • Luck: Spend after a roll, point for point, to turn a failure into a success; can't be used on Sanity, damage, Luck rolls, or pushed rolls

Common mistakes

  • Mistake: Using a generic 1d20 roller for a pool or percentile system. Fix: Pick the system-specific roller, pools, hunger, sanity loss, and crits all key off it.
  • Mistake: Re-rolling until you like the result. Fix: One roll per intent; if you want another attempt, change position, resources, or stakes first.
Roll resolution
Fast lookup while running scenes.
System guide
Rules + key concepts in one place.

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.

System guide
Rules + key concepts.
System glossary
Definitions for system terms.

Recommended next steps

Character sheet
Use the online sheet and keep it current.
Character creation
Checklist + builder entry points.
Advancement
Track progression with a clean workflow.

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