Your skill level on court is the final question that needs to be addressed in order to nail down your ideal string tensions. Here are those tension ranges again, narrowed down even further for each playing level.
Nylon/Gut: 50-60lbs (22.5-27kg)
Power: 50-55lbs (22.5-25kg)
Beginner: 54-55lbs (24.5-25kg)
Intermediate: 52-53lbs (23.5-24kg)
Advanced: 50-51lbs (22.5-23kg)
Control: 56-60lbs (25.5-27kg)
Beginner: 59-60lbs (26.75-27.25kg)
Intermediate: 57-58lbs (26-26.5kg)
Advanced: 55-56lbs (25-25.5kg)
Hybrid: 46-56lbs (21-25.5kg)
*Because polyester is a stiffer material, string 2lbs (1kg) looser than nylon
Power: 46-51lbs (21-23kg)
Beginner: 50-51lbs (22.5-23kg)
Intermediate: 48-49lbs (21.75-22kg)
Advanced: 46-47lbs (21-21.5kg)
Control: 52-56lbs (23.5-25.5kg)
Beginner: 55-56lbs (25-25.5kg)
Intermediate: 53-54lbs (24-24.5kg)
Advanced: 52lbs (23.5kg)
Polyester: 44-54lbs (20-24.5kg)
Power: 44-49lbs (20-22kg)
Beginner: 44-45lbs (20-20.5kg)
Intermediate: 46-47lbs (21-21.5kg)
Advanced: 48-49lbs (21.75-22kg)
Control: 50-54lbs (22.5-24.5kg)
Beginner: 50lbs (22.5kg)
Intermediate: 51-52lbs (23-23.5kg)
Advanced: 53-54lbs (24-24.5kg)