Technology & Computing
Gustafson's Law Scaled Speedup Calculator
Calculate scaled speedup for a growing (weak-scaling) workload across processors, per Gustafson's Law.
Your inputs
Change any value to update the result instantly.
Scaled speedup
7.3 x
Processors used
8
Parallelizable fraction
90%
Serial fraction
10%
Speedup per processor added
0.9125 x
Gustafson's Law assumes the problem size grows with processor count, giving more optimistic scaling than Amdahl's Law.
Formula and working
Scaled speedup = N − (1 − P) × (N − 1), where P is the parallelizable fraction and N is the number of processors
- 1
Collect the inputs
Parallelizable fraction of workload = 90 %; Number of processors = 8
- 2
Apply the formula
Scaled speedup = N − (1 − P) × (N − 1), where P is the parallelizable fraction and N is the number of processors
- 3
Result
Scaled speedup = 7.3 x
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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