Free Random Generators Calculators

8 free tools · Generate random numbers, passwords, dice rolls, colors, and more.

8 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 one secure lottery ticket line for Powerball, Mega Millions, EuroJackpot, Viking Lotto, UK Lotto, or Irish Lotto with optional locks and saved tickets.

UUID Generator | UUID v4

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

About Random Generators Calculators

Random number generators, password generators, dice simulators, and colour pickers provide cryptographically seeded or statistically uniform randomness for games, security, sampling, and creative work.

Who uses these tools: Game masters running tabletop roleplaying games, security professionals generating passwords, researchers drawing random samples, developers testing software, and educators creating randomised quiz questions.

Tips for best results: For security-sensitive applications (passwords, cryptographic keys), use a generator that explicitly states it uses a cryptographically secure random source (CSPRNG). For statistical sampling, a uniformly distributed pseudo-random generator is usually sufficient.

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