Quick answer: This generator picks integers uniformly between your minimum and maximum, so every value in the range is equally likely. It uses a pseudorandom algorithm, which is fine for games, draws, sampling and shuffling. For cryptography, lotteries or security tokens, use a cryptographically secure generator or hardware randomness instead.
Last reviewed: September 2026
Generate numbers
Key facts
- Random integer = floor(random × range) + min — every value in the range is equally likely.
- A 1–100 draw gives each number exactly a 1% chance — including 100 itself.
- Each draw is independent — past results never change the odds.
- Browser randomness is fine for games and giveaways, not for passwords or cryptography.
A random number generator picks an unpredictable number inside a range you choose. This free tool generates random integers instantly — for raffles, dice rolls, sampling, shuffling, and everyday decisions.
Set the minimum, maximum, and how many numbers you want. Each result appears at once.
How to use
- Enter the minimum and maximum values.
- Choose how many numbers to generate.
- Press Calculate — your random numbers appear instantly.
Random integer formula
| Term | Meaning |
|---|---|
| random() | A decimal from 0 (inclusive) to 1 (exclusive). |
| max − min + 1 | How many integers the range holds (the +1 includes both ends). |
| floor() | Rounds down to a whole number. |
| + min | Shifts the result up into your chosen range. |
Example: min 1, max 100, random() = 0.4173 → floor(0.4173 × 100) + 1 = 41 + 1 = 42.
Worked examples
Raffle draw (1–100)
Range 1–100, one number: each integer has a 1/100 = 1% chance. A draw of 42 is exactly as likely as 1 or 100 — randomness has no favourites.
Dice roll (1–6)
Range 1–6, one number: each face has a 1/6 ≈ 16.7% chance. Rolling three times gives three independent results, e.g. 4, 2, 6 — the die has no memory of previous rolls.
Odds for common ranges
| Range | Values | Chance of any one value | Typical use |
|---|---|---|---|
| 1–2 | 2 | 50% | Coin flip, yes/no |
| 1–6 | 6 | 16.7% | Dice roll |
| 1–10 | 10 | 10% | Quick picks |
| 1–100 | 100 | 1% | Raffles, percentages |
| 1–1000 | 1000 | 0.1% | Large draws, IDs |
Every draw is independent, so each number keeps the same odds on every draw — like rolling a die again and again.
Frequently asked questions
Is it truly random?
It uses your browser’s pseudo-random generator — unpredictable enough for games, raffles, and sampling, but not for security. For passwords or tokens, use a cryptographic generator.
Can the same number appear twice?
Yes. Every draw is independent, so repeats are possible — in a 1–100 draw, the previous number repeats about 1% of the time.
Why did I get the same number twice in a row?
That is normal. In a 1–100 draw, back-to-back repeats happen about 1% of the time — randomness clusters more than intuition expects.
Is the maximum included?
Yes. Both ends of the range are included, and each value — min and max included — has identical odds.
Can I generate decimals?
This tool generates whole numbers. For a random decimal, generate an integer and divide — e.g. 1–1000 divided by 1000 gives 0.001–1.000.
Sources
- Random.org — True random numbers and randomness explained
- NIST — Randomness testing and standards
Key takeaways
- Every value in the range is equally likely; both endpoints are included.
- Draws are independent — past results never influence the next one.
- Great for games and giveaways; use cryptographic randomness for anything security-related.
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