Call of Cthulhu Dice Roller
Call of Cthulhu is a percentile game: roll a d100 and succeed if the result is equal to or under your skill, with a hard success at half your skill and an extreme success at a fifth. The d4, d6 and d8 roll weapon damage, and an expression such as 1d6 + 1d4 adds a damage bonus.
Roll Results
How to write dice
dS- One die with S sides, such as d6 or d20.
NdS- N dice with S sides each, added together.
dSadSd- Roll twice with advantage (keep the higher) or disadvantage (keep the lower).
h&f- Daggerheart's duality dice: a Hope d12 and a Fear d12.
+-*- Add, subtract and multiply, with * before + and -.
( )- Group part of an expression to change the order.
Examples
1d20- Roll one 20-sided die.
2d6 + 5- Roll two 6-sided dice and add 5.
1d10 - 2- Roll one 10-sided die and subtract 2.
3d8 + 2d4- Roll three 8-sided dice and two 4-sided dice.
2d6 * 3- Roll two 6-sided dice and multiply by 3.
(1d4 + 2) * 3- Roll a d4, add 2, then multiply by 3.
d20a- Roll a d20 with advantage.
d20d- Roll a d20 with disadvantage.
d20a + 5- Roll a d20 with advantage and add 5.
h&f- Roll Daggerheart's Hope and Fear dice.
h&f + 3- Roll Hope and Fear with a +3 modifier.