Random Number Generator
Last updated: June 2026 · Free · No sign-up required
Enter values above and click Calculate to see your result instantly.
Quick reference
| Setting | Effect |
|---|---|
| Minimum/maximum | Defines possible values |
| Allow repeats | Same number can appear more than once |
| No repeats | Draws without replacement |
| Seed | Needed only for reproducible draws |
edit_note What you need
Have your numbers ready before you start. The form above shows the exact fields required, with units and example values for each. Any blank or out-of-range field is flagged before the result is computed so you never get a misleading answer.
function How it computes
The random number generator applies the published reference formula and rounds the result to a useful precision. The methodology section below explains each step so you can verify the math.
verified Trusted source
Reference values and constants come from an authoritative source. Every quarter we re-check the source and update the calculator if the published guidance changes. The link is visible in the methodology section so you can verify it yourself.
tips_and_updates Read it like this
Read the headline number first, then open the breakdown card to see how each input contributed. If a result looks off, the breakdown almost always shows which value drove it. Adjust that input and recalculate — the answer updates instantly.
Interpretation guide
| Use | Tip |
|---|---|
| Games | Set inclusive range correctly |
| Raffles | Use no-repeat draws |
| Security | Use cryptographic tools for passwords/keys |
Formula & methodology
Formula: Random integer = floor(random × range) + minimum
A random number generator maps a uniform random value onto the requested range. For casual use this is fine; security-sensitive randomness needs cryptographic APIs.