Random Number Generator
Random integer = floor(random × (max−min+1)) + minRandom real in [0,1) scaled to [1,101) and floored
Free online tool
Random Number Generator
Enter minimum and maximum values to generate a random integer.
Instant calculation
Random Number Generator
Enter minimum and maximum values to generate a random integer.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter minimum
Type the lowest possible number.
- 02
Enter maximum
Type the highest possible number.
- 03
Generate
Calculate to produce a random number in the range.
The formula
How this calculation works
Generates a uniformly distributed random integer inclusive of both min and max.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
Random number between 1 and 100?
Random real in [0,1) scaled to [1,101) and flooredRandom integer 1–100Common questions
Questions about this calculation
What is the Random Number Generator?
The Random Number Generator helps you generate a random number within a specified range. Enter your values and select Calculate to get an instant result.
How is the result calculated?
Generates a uniformly distributed random integer inclusive of both min and max.
Can you show an example?
Example: Random number between 1 and 100? — Random integer 1–100.
Is my data saved when I use the Random Number Generator?
No. All calculations run locally in your browser. Your inputs and results are never uploaded, stored or shared with anyone.
Is the Random Number Generator free to use?
Yes. The Random Number Generator is completely free. No account, sign-up or payment is required. It works on mobile, tablet and desktop.
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