CalcRover

Random Number Generator 1–10

One click gives you a fair random number from 1 to 10 — every value has exactly a 1-in-10 chance. Built for ratings out of ten, decimal digits, and classroom number picks. The From/To fields let you switch to any other range on the spot.

How the pick works

The generator asks your browser's cryptographic random source (crypto.getRandomValues) for a value and maps it uniformly onto 1…10, so every outcome has probability exactly 1/10 — no pattern, no memory of previous picks.

Independence is the point: a number is never "due". Each click is a fresh draw, like a fair die that can't remember what it rolled before. Everything runs locally in your browser.

P(each value) = 1/10
each click = independent draw (no memory)

Worked examples

Example 1: picking a random digit for a math drill

The classic 1–10 use case, done fairly.

  1. Generate one number 1–10 (use 10 as "0" for digit drills).
  2. Repeat per round; each value has exactly a 10% chance.

A fair pick nobody can argue with.

Example 2: generating several at once

You need a handful of values from 1–10.

  1. Set "How many" to the count you need.
    draws are independent — repeats can occur
  2. Copy the list with the Copy button.

A batch of independent draws, like rolling the same die repeatedly.

FAQ

Is every number from 1 to 10 equally likely?+

Yes — the draw is uniform: each value has probability exactly 1/10, verified by the mapping from the browser's cryptographic generator.

Can the same number come up twice in a row?+

Of course — independent draws have no memory, and back-to-back repeats happen with probability 1/10. A repeat is evidence of fairness, not brokenness.

Can I use a different range?+

Yes — edit the From and To fields for any whole-number range (negative numbers included), or tap the preset chips for the common 1–3 through 1–100 ranges.

Is this fair enough for raffles and giveaways?+

For informal draws, absolutely — cryptographic randomness is stronger than dice. For regulated lotteries you'd need an audited process, which no browser page provides.

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