Dice rollers, coin flippers, lottery, and random number generators. Browse our free dice & random tools below — all calculators are instant, accurate, and require no sign-up.
10-Sided Dice Roller — Roll d10 dice online with customizable count, modifiers, keep highest/lowest, and exploding dice. Perfect for RPGs, percentile rolls, and probability games.
2 Dice Roller — Roll two dice online with adjustable sides, modifiers, drop highest/lowest, and target checks. Full sum distribution and doubles tracking included.
4-Sided Dice Roller — Roll d4 dice online with modifiers, keep highest/lowest, reroll 1s, and preset configurations. Track face frequency and review full roll history.
6-Sided Dice Roller — Roll d6 dice online with presets for 1d6–8d6, modifiers, keep highest/lowest, reroll 1s, and full face distribution charts. Perfect for board games and RPGs.
Coin Flip Streak Calculator — Simulate coin flips and analyze streaks. Find the longest heads/tails run, streak distributions, and compare observed results to mathematical expectations.
Coin Flipper — Flip a coin up to 10,000 times with adjustable bias. Track heads/tails counts, streaks, z-scores, running percentages, and alternation rates.
Custom Dice Roller — Roll any dice configuration from d2 to d1000 with modifiers, keep modes, exploding dice, and minimum face values. Full statistical analysis and frequency charts.
d20 Dice Roller — Roll d20 dice with advantage/disadvantage, modifiers, DC checks, natural 20/1 tracking, and face frequency analysis. The essential D&D dice roller.
d100 Dice Roller — Roll d100 (percentile) dice online with standard or two-d10 percentile mode. Includes success threshold checks, critical hits/fails, and decile distribution.
Dice Calculator — Multi-group dice calculator supporting mixed dice types (d4+d6+d20), modifiers, take highest/lowest, and batch rolls. Build any dice expression for RPGs.
Dice Average Calculator — Calculate expected averages, min/max, and standard deviation for any dice expression. Supports drop lowest, reroll, exploding dice, and modifiers.
Dice Roller — Roll any number of dice with any sides online. Full roll history, sum distribution, face frequency analysis, and sorting options. The classic virtual dice roller.
D&D Dice Roller — Dungeons & Dragons dice roller with advantage/disadvantage, attack vs AC, damage combos, critical hit detection, and full D&D DC/dice reference tables.
Lottery Calculator — Calculate lottery odds, expected value, and prize probabilities for any lottery format. Generate random numbers and compare Powerball, Mega Millions, EuroMillions odds.
Roulette Payout Calculator — Calculate roulette payouts, house edge, win probabilities, and expected value for every bet type. Simulate spins and compare American vs European wheels.
Random Dice Roller — Roll completely randomized dice — random count, random type, optional random modifier. Great for surprise encounters, writing prompts, and dice warm-ups.