Board Foot Calculator Board Foot Calculator Board Foot Calculator Calculate Board Feet In a Tree Entry Form Tree Length: In feet Large Diameter:In inches Small Diameter:In inches Answer Total Cubic Ft.: Total Board Feet: Logs to Make 1 Cord: How To Use This Board Feet Calculator. Enter length of log in feet. Enter large diameter in inches. Enter small diameter in inches. Cords of Wood Calculator Index © Find N Choose Serving the Internet Community Since 1998 - All Rights Reserved. Board Foot Calculator, Smalian Formula. Calculate Board Feet, and cubic feet in a Tree. Calculate Number of Trees to Make a Cord.