DnD Dice Notation Parser and Roller

You open a monster stat block and there it is: 2d8+3 damage. Except your dice are still in the bag you left at someone else's place, or the whole table is on Discord and nobody wants to trust the mental math. Type the expression exactly as it appears on the sheet and the page gives you the total with the modifier already applied, plus every individual die that came up so you can see where the number came from.

The field takes one dice group in NdF form, with an optional modifier that needs an explicit sign: 3d6+2, d20, 2d8-1. Leave the N out and it becomes 1, an uppercase D works the same, and spaces are ignored. Compound expressions like 2d6+1d8 are not parsed, and neither are keep-highest shortcuts such as 4d6kh3 used for ability scores. Limits are 1 to 100 dice and 2 to 1000 faces, so d3 and d100 work but d1 does not.

There is no roll button. A result appears when the page loads and again on every change to the field, so to reroll the same expression just delete the last character and type it back. For advantage or disadvantage, roll d20 twice and keep the higher or lower number. Randomness comes from the browser's own generator, everything runs on your machine and nothing is sent to a server. For anything with money riding on it, use another method.