What is the Random Number Generator 1-10?
This tool draws a random whole number between 1 and 10 (inclusive). It uses a pseudo-random number generator (PRNG) so every press of the Pick button produces a fresh, independent result. Each of the ten numbers has exactly the same 1-in-10 chance, making it ideal for games, raffles, classroom activities, decision-making, and any situation where you need a quick, fair pick.
How to use it
Just press Pick. The big number is your Answer, and the "Pick #" counter shows how many times you have drawn during this session. Press Pick again to draw a new number; the counter increases by one each time. Press Reset to set the counter back to 1 and start over.
The formula explained
The generator uses a uniform discrete draw over the range [min, max]. With min = 1 and max = 10, the count of possible values is \(\text{max} - \text{min} + 1 = 10\). The result is computed as $$R = \left\lfloor 1 + \text{rand}() \times 10 \right\rfloor, \quad 1 \le R \le 10$$ where rand() returns a uniform real number in [0, 1). The floor function turns that into an index 0-9, and adding the minimum shifts it to 1-10. A guard clamps the output so it never exceeds the maximum even if the generator ever returned exactly 1.0: $$R = \min\!\left(10,\; 1 + \left\lfloor \text{rand}() \times 10 \right\rfloor\right)$$
Worked example
Suppose rand() returns 0.4732 on a Pick. Then $$R = 1 + \left\lfloor 0.4732 \times 10 \right\rfloor = 1 + \left\lfloor 4.732 \right\rfloor = 1 + 4 = 5$$ so the Answer is 5. On the next Pick with \(\text{rand}() = 0.987\), $$R = 1 + \left\lfloor 9.87 \right\rfloor = 1 + 9 = 10$$ giving Answer 10 at Pick # 2. The probability of any one specific number, such as 7, is $$P = \frac{1}{10} = 0.1 = 10\%$$
FAQ
Are the numbers truly random? They are pseudo-random: statistically fair for everyday use but not cryptographically secure, so do not use them for security or lottery-grade purposes.
Can the same number repeat? Yes. Each draw is independent and results are not deduplicated, so repeats are normal and expected.
Why does my distribution look uneven? Over a small number of picks, results can look lopsided. Over many draws each number trends toward 10% of the total.
