Random Number Generator & Dice
Roll dice, flip a coin, generate random numbers, work out percentages and split a bill with a tip — all in one place.
Random number
Dice roller
Coin flip
Percent calculator
% of=20
is what % of=125.0%
Change from 40 to 50: +25.0%
Tip calculator
Randomness, simply
These tools use your browser's random number generator to produce unpredictable results — handy for games, classrooms, raffles and quick decisions. Set a range and roll, or flip a coin to settle a toss-up.
Frequently asked questions
Are the numbers truly random?
They are generated using your browser's built-in pseudo-random generator, which is fine for games and everyday use. For cryptography, use the password generator, which uses the Web Crypto API.
Can I roll multiple dice at once?
Yes — choose between 1 and 6 dice and the roller shows each result plus their sum.
Does the tip calculator split the bill?
Yes. Enter the bill, tip percentage and number of people to get the tip, total and amount each person pays.