Free Random Generators Calculators

Random Number Generator

Generate random integers or decimals within any range. Generate single or multiple numbers at once.

Random Password Generator

Generate strong, secure random passwords with custom length and character sets.

Dice Roller — D4 to D100 with Advantage

Roll any combination of dice including D4, D6, D8, D12, D20, D100, or fully custom sides. Supports advantage, disadvantage, drop-lowest, modifiers, probability distribution charts, and full roll history.

Random List Picker

Enter a list of items and randomly pick one or more. Perfect for decisions, giveaways, and selections.

Coin Flip Simulator — Heads or Tails Online

Free online coin flip simulator with animated flip, adjustable bias (0–100%), batch flipping up to 100,000 times, live statistics (z-score, chi-square, streak tracking), flip history grid, and session persistence. Demonstrates the law of large numbers in real time.

Random Color Generator — HEX, RGB

Generate random colors with HEX, RGB, and HSL values. Copy values instantly.

Lottery Number Generator

Generate random lottery numbers for Powerball, Mega Millions, or custom number ranges.

UUID Generator — UUID v4

Generate UUID v4 universally unique identifiers instantly. Generate single or bulk UUIDs.