Dice Roller

How are the dice rolled?

Each die is Math.floor(Math.random() * sides) + 1, so every face from 1 up to the number of sides has an equal chance. The generator is the browser’s ordinary pseudo-random function, which is fine for games but not designed for gambling or security. Dice are independent of each other and of earlier clicks, and a roll cannot be replayed.

What are the limits on dice count and sides?

The number of dice is clamped between 1 and 100: entering 500 rolls 100 dice and the result label reads 100D6. Any die with fewer than 2 sides returns an error. Custom sides are only used when "Custom sides" is chosen in the dropdown, and if the custom field is empty or 0 (an emptied box counts as 0) the tool silently uses 6 sides.

How does the modifier work?

The modifier is a whole number added once to the total of all dice, not to each die. 3D30−2 rolls three 30-sided dice and subtracts 2 from their sum. Decimals are cut to whole numbers (1.5 becomes 1) and text counts as 0. The "Sum of Rolls" line shows the total before the modifier so you can see both.

Does it know about critical hits, advantage or rerolls?

No. It rolls and adds. There is no advantage or disadvantage, no keep-highest, no exploding dice and no highlighting of a natural 20 or natural 1. For a d20 check with advantage, roll two d20 and read the higher value from the Individual Rolls line yourself.

How do I roll a percentile d100?

Choose D100, which gives one uniform result from 1 to 100 in a single roll. The physical two-die method (tens die plus units die) is not reproduced, and a physical 00 reading as 100 does not apply here.

What do Min possible and Max possible show?

They are the theoretical bounds for your setup: the dice count plus the modifier at the low end, and dice count × sides plus the modifier at the high end. For 2D6+3 the range is 5 to 15. Real rolls cluster in the middle, so the extremes are rare.

Are the individual dice listed?

Yes, in the order rolled, as a comma-separated list under Individual Rolls. With 100 dice the list is long, but it lets you check the arithmetic or apply house rules such as dropping the lowest die.