How polyhedral dice set roller works
Tabletop role-playing games use a family of dice named for their number of sides: the d4 pyramid, d6 cube, d8 crystal, d10 spindle, d12 dodecahedron and d20 icosahedron. This tool rolls the whole set in one click — by default one of each, the familiar dice-bag contents — and reports every individual face, the subtotal for each die type, and the grand total. Each die produces an integer from 1 to its side count with equal probability, exactly like a fair physical die.
The per-type counters adapt to what your system asks for: set d6 to 4 to roll 4d6 for a D&D ability score, add a d4 for a dagger's damage dice, or zero out everything but the d20 for a night of pure saving throws. The modifier box adds or subtracts a flat amount once from the subtotal — not per die — mirroring how bonuses work in most systems (+5 to a d20 check, −1 to damage for a dull blade). Values shown stay between 1 and the side count for every die, so totals are easy to verify by hand.
An optional seed makes a roll reproducible: the same dice configuration and seed always produce the same faces, which is handy for showing a disputed roll, replaying a scene in a solo campaign, or testing a homebrew rule. Without a seed, each roll is fresh from your browser's own random source, and nothing is sent to any server. For the probability behind the shapes — why 3d6 clusters around 10.5 while a single d20 stays flat — see the deep-dive guide linked below.