PHP Workers Estimation Tool
PageViews Per day
If you only know the unique visits, try to multiply it by 60 to get a basic estimate.
PHP Response Time
Estimate it using GTMetrix: find the
Fully Loaded Time
Uncached Percentage (0 to 100)
Cache BYPASS+MISS percentage from MyKinsta analytics)
Enter the default value if you're not sure = 25
PHP Workers Recommended
This recommendation is
to follow the general recommendations.
It doesn't take into consideration any future traffic increase, and how much the lead/client is expecting to scale.
Always double check with a SysAdmin.