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Calculators / Math / Seeded random number
Seeded random number calculator
Generate a reproducible pseudo-random whole number from a numeric seed and range.
On this page
Generated whole number28
Seed used12,345
Calculator controls
How to calculate
Generate a reproducible pseudo-random whole number from a numeric seed and range.
Use a deterministic linear congruential step, then map it to the inclusive integer range.
Worked example
Numeric seed: 12345; Minimum whole number: 1; Maximum whole number: 100.
Generated whole number: 28 ; Seed used: 12,345 .
Assumptions and limits
This is reproducible and useful for examples, but it is not cryptographically secure and must not be used for passwords, gambling or security.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Generate a reproducible pseudo-random whole number from a numeric seed and range. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the seeded random number to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Numeric seed | Enter a number of at least 0 and no more than 2147483646. |
| Minimum whole number | Enter a number of at least -1000000000 and no more than 1000000000. |
| Maximum whole number | Enter a number of at least -1000000000 and no more than 1000000000. |
Frequently asked questions
What should I check before using the seeded random number result?
This is reproducible and useful for examples, but it is not cryptographically secure and must not be used for passwords, gambling or security.
Is this seeded random number result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.