🎲 Random Number Generator 1 to 6

What is the Random Number Generator 1-6?

A range of 1 to 6 has exactly 6 possible whole numbers, which is why it maps so directly onto a standard die. This preset suits anything that genuinely has 6 outcomes: a board game roll, choosing one of 6 people or items, or picking a random day-adjacent option when you need a small, fair spread. It is not stretched to fit larger ranges like lottery numbers or PIN codes, because those need a different span to stay honest.

Fairness here comes from the Web Crypto API rather than a simple formula. The tool pulls a 32-bit value from crypto.getRandomValues and uses rejection sampling before mapping it into the 1 to 6 range. That extra step matters because a plain modulo operation (dividing by 6 and keeping the remainder) very slightly favors the low end of the range whenever the source does not divide evenly by 6. Rejection sampling discards the small uneven tail of values first, so what is left maps cleanly onto the 6 outcomes and none of them is favored over another.

The how many field lets you roll more than one number at once, for example 2 dice for a board game that uses a pair. With Allow duplicate numbers ticked, each roll is independent, exactly like throwing a real die more than once, so the same face can come up twice in a row. Untick it and the tool switches to drawing without replacement using a partial Fisher-Yates shuffle, so results stay unique. Because there are only 6 distinct values available, unique mode caps out at 6 numbers per generation.

The Sort results ascending checkbox is a display option only. It reorders the numbers you already rolled from low to high, which is handy when you rolled several dice and want to read them off in order, but it changes nothing about which numbers were picked.

When to use it

• Rolling a virtual six sided die when you do not have a physical one nearby.
• Simulating multiple dice at once for board games and tabletop role playing.
• Choosing randomly between up to 6 people, teams, tasks, or options.
• Picking a random day of a 6-day work or gym rotation.
• Settling a quick decision fairly without any dice on hand.
• Teaching probability and fair outcomes with a real 1 in 6 chance per value.

How to use the Random Number Generator 1-6

1. The minimum is already set to 1 and the maximum to 6, matching a standard die.
2. Set how many numbers you want, for example 2 to simulate a pair of dice.
3. Tick Allow duplicates for independent rolls, or untick it for unique numbers only.
4. Optionally tick Sort results to list multiple rolls in ascending order.
5. Click Generate for a new roll, then Copy to put the result on your clipboard.

Formula & method

Worked examples

How this range compares to other common ranges

How the duplicates toggle changes a 1 to 6 result

Common mistakes to avoid

• Requesting more than 6 numbers with duplicates off. The 1 to 6 range only has 6 distinct values. With Allow duplicates unticked, asking for 7 or more numbers is impossible since each value can only be drawn once. Either lower the count to 6 or fewer, or turn duplicates back on.
• Assuming a small run will look perfectly even. A fair die can still land on the same face two or three times in a row over a handful of rolls. That is normal randomness, not a broken generator. Fairness only becomes visible as an even spread across many rolls, not in the first few.
• Forgetting to add up multiple dice yourself. When how many is set above 1, the tool shows the individual numbers rolled, for example 4, 2. It does not sum them into a single total, so for games that need a combined score you add the numbers yourself.
• Widening the range without checking it still fits the use case. The 1 to 6 preset is honest for a standard die or any genuine 6-outcome choice. If you change the maximum to, say, 20, the result no longer represents a six sided die, it represents a twenty sided one, so only widen the range when your actual use case calls for it.

Glossary

Uniform distribution

A spread where every value in the range has exactly the same probability of being chosen, so with 1 to 6 each number has precisely a 1 in 6 chance.

Rejection sampling

A technique that discards the small uneven portion of raw random values before mapping the rest onto a range, which removes modulo bias and keeps every outcome equally likely.

With and without replacement

With replacement means each roll is independent and a number can repeat, like a real die. Without replacement means each value is used at most once, capping the unique draws at 6.

Web Crypto API

A browser built-in source of cryptographically strong randomness, used here instead of a simple predictable formula so results cannot be reproduced or guessed.

Six sided die (d6)

A standard cube-shaped die with faces numbered 1 through 6, the physical object this 1 to 6 range is modeled on.

Frequently asked questions