When to use this calculator
Translate an ideal search-space size and assumed test rate into an average search time. A simplified uniform search model, not an assessment of a real credential or attack capability.
Explore the storage & compression calculators for other questions in this topic. For a related calculation, use the Backup Storage Calculator: Estimate storage for retained full backups with an assumed compression ratio.
PUTTING IT INTO PRACTICE
Average Brute Force Time: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Uniform search-space entropy (bits) | 20 |
| Assumed guesses per second | 1,024 |
| Result | 512 s |
- Check the input labels and enter the example values above.
- Apply the relationship: Average seconds ≈ 2^bits/(2 × guesses per second).
- The result is 512 s, rounded for display.
How to interpret your result
A simplified uniform search model, not an assessment of a real credential or attack capability.
Specify decimal or binary units before comparing storage totals. Full-backup retention differs from incremental or deduplicated backup plans. Compression can sometimes increase size when data is already compressed.
Frequently asked questions
Is a 4:1 compression ratio a 400% saving?
No. It means the compressed size is one quarter of the original, corresponding to a 75% size reduction.
When is the average brute force time calculator useful?
Translate an ideal search-space size and assumed test rate into an average search time. A simplified uniform search model, not an assessment of a real credential or attack capability.
How do I use the average brute force time calculator?
Enter uniform search-space entropy (bits), assumed guesses per second. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Average seconds ≈ 2^bits/(2 × guesses per second).
What should I check before using the result?
A simplified uniform search model, not an assessment of a real credential or attack capability.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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