Technology & Computing
Amdahl's Law Parallel Speedup Calculator
Calculate theoretical maximum speedup from parallelizing part of a workload across multiple processors, per Amdahl's Law.
Your inputs
Change any value to update the result instantly.
Theoretical speedup
4.7059 x
Max speedup (N → ∞)
10 x
Parallelizable fraction
90%
Processors used
8
Serial fraction
10%
Even a small serial fraction sharply limits achievable speedup as processor count grows.
Formula and working
Speedup = 1 ÷ ((1 − P) + P/N), 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
Speedup = 1 ÷ ((1 − P) + P/N), where P is the parallelizable fraction and N is the number of processors
- 3
Result
Theoretical speedup = 4.7059 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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