Generated values
Each generated number, shown for a quick visual comparison.
Home / Math Calculators / Random Number Generator
Math & Statistics
Random Number Generator
Generate one or many random numbers in any range. Choose integers or decimals, and allow or forbid duplicate values.
Your random numbers
Count—
Sum—
How it works
The generator uses your browser's built-in pseudo-random function to pick numbers uniformly across the range you set, inclusive of both ends. With "unique values" on, it draws without replacement so no number repeats.
integer = floor( random × (max − min + 1) ) + min
decimal = random × (max − min) + min
decimal = random × (max − min) + min
- Great for raffles, dice, sampling, picking a winner, or seeding test data.
- Not for security — use a cryptographic generator for passwords or keys.
Frequently asked questions
Are these numbers truly random?
They are pseudo-random from your browser — plenty random for games, raffles, and sampling, but not for cryptography.
Can I avoid duplicates?
Yes — enable "unique values" and every result is different, provided the range is large enough.