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Amdahl Law Calculator
Theoretical speedup of a program when only part of it can be parallelised across processors.
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Theoretical speedup of a program when only part of it can be parallelised across processors.
Amdahl Law Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: S = 1 / ((1-p) + p/n).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Amdahl Quick Guide
Typical values for reference.
| Parallel | Cores | Parallel | Speedup |
|---|---|---|---|
| 0.5 | 8 | 0.5 | 1.78x |
| 0.9 | 8 | 0.9 | 4.71x |
| 0.95 | 16 | 0.95 | 9.14x |
| 0.99 | 64 | 0.99 | 39.26x |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Amdahl Law Calculator FAQ
Answers to common questions about this calculator.
Speedup is limited by the portion that cannot run in parallel.
It is an upper bound; overheads reduce it.
S = 1 / ((1-p) + p/n).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.