what is the correct math used for time stretching a sample??

When u want to time stretch you get a ratio number which is defaulted at 100 percent and then u get the option for the type of voice you want to use. I know i can just select the bpm option and match the sample speed to what ever tempo i have but is it better to go with the ratio option?? I heard a specific type of math is used with the ratio feature but no has ever been able to help me out. Do any of the great minds here have the correct arithmitic?? Please heeeeeeeeeellp meeeee!!!!!!!!! LOL thx!!

Theirs a chart floating around. Ask LampDog

lamp dog?? who's dat?? i'm new and dont have a clue as 2 who that is. can u link me to a thread that has the chart??

In my "USEFUL LINKS" thread link below there is a link for a timestretch calculator website, that will help you out.