So what do you have now?

Suspension correction generally is for bikes from the 90's, everything available since about 2000 (going on a 26" 80-100mm bike) is corrected out the box.

You really need to provide details of the bike, wheel size, fork/travel now, planned replacement etc, otherwise, it's all guess work, as with the info given, you could have 3 different wheel sizes which would all give different answers.