SLot port length help????

SLot port length help???? slot port length calculator App description Subwoofer vent length calculation Calculation of vent length, volume of box, tuning frequency, and end correction factor slot paradise I use to use this website for enclosure calculations, and just wondering if can get something similar but for L slot ports I actually found

slot receh Port Length Calculator HowTo-1Woofer-Box-CAL