Dice Roller

Math Rocks Spinning Machine

Roll RPG notation with reel-style visuals and instant results. Up to 30 dice, keep highest/lowest, and highlight rules.

Notation reference — what you can roll and how

Type notation in the box below and pull the lever. The Math Rocks Spinning Machine parses standard RPG dice expressions, rolls immediately, then spins the reels to land on those results.

Dice per spin: 1–30
Sides per die: 2–100, or %

Basic rolls

Standard tabletop notation: how many dice (N), how many sides (S). Spaces are ignored. If you omit the quantity, it defaults to 1.

Notation	Meaning
1d20	Roll one twenty-sided die (1–20).
d20	Same as 1d20.
3d6	Roll three six-sided dice; total is the sum of all three.
2d6+3	Roll 2d6, sum the dice, then add 3 to the total.
1d12-2	Roll 1d12, then subtract 2 from the result.

Limits

You can roll between 1 and 30 dice per spin. Each die must have between 2 and 100 sides. Use d% for a percentile die (1–100).

Keep highest / lowest (kh / kl)

After rolling, keep only the highest or lowest values and drop the rest. The total uses kept dice only. Keep count must be between 1 and the number of dice rolled. On the reel, kept dice show bright green values with a green wash; dropped dice keep the gold frame but use a dimmer green with no wash.

Notation	Meaning
4d6kh3	Roll four d6; keep the three highest; total = sum of those three.
5d10kl2	Roll five d10; keep the two lowest.

Highlight (hN+) — visual only

After the reels land, any die showing value N or higher gets a purple accent text glow on top of the normal keep styling. Does not change the math. On d%, highlight compares the full 1–100 result — both tens and units cells glow together when it matches. The + in h5+ is part of the highlight token, not a modifier.

Notation	Meaning
30d6h5+	Roll thirty d6; purple glow on every die showing 5 or higher.
4d6kh3h5+	Keep highest 3; purple glow on any die (kept or dropped) that is 5+.
30d6h5++3	Highlight 5+, then add +3 to the total (not the same + as in h5+).
d%h50+	Percentile roll 1–100; both reel cells glow when the full roll is 50 or higher.

Token order (required)

When combining keep, highlight, and modifiers, write them in this order only: kh/kl → hN+ → +/- modifier. Out-of-order forms are rejected.

Notation	Meaning
4d6kh3h5+	Valid — keep, then highlight.
4d6h5+kh3	Invalid — highlight must come after keep.

Percentile (d%)

d% rolls one number from 1 to 100. On the reel it appears as two cells: tens (00, 10, … 90) and units (0–9). A roll of 100 shows as 00 and 0.

What you see on the machine

The total in the result panel is authoritative (including keep rules and modifiers). While spinning, every active cell shows the same neon green digits. After the reels land, outcome styling applies instantly: every rolled die gets a gold frame; kept dice add a bright green value and green wash; dropped dice (from kh/kl) stay framed but dimmed; hN+ adds a purple accent glow on matching values and stacks with keep styling. The cabinet is a fixed 5×6 grid — your dice fill from the bottom row up, centered; unused slots show decorative filler digits that are not part of the roll.

Notation	Meaning
3d6	All three dice: gold frame, bright green values, and green wash (no drops).
4d6kh3	Four gold frames; three bright green + wash; one dimmed green drop.
4d6kh3h5+	Same as kh3, plus purple glow on any die showing 5+ (kept or dropped).
7d6	Seven dice: bottom row holds five, next row holds two centered.

Reproducible rolls (testing)

Append ?seed=any-text to the URL to get the same results and spin timing on reload. Useful for screenshots and bug reports. Without a seed, rolls use your browser’s secure random source.

Notation	Meaning
?seed=tabletop-night	Same rolls every time you spin with that seed until you change notation or refresh the seed.

Composer

Build a roll with named groups and pools.

Saved (9 max)