How to Resize Cold Process Soap Recipes

Since I have a four pound slab mold, I have always made a four pound batch of cold process soap plus that is what I learned when I took a class from The Nova Studio.  I always wondering about resizing a batch since I do have a three pound log mold that I purchased from Michaels long ago for that I was planning to use for melt and pour soap.  Now I want to use it for CP soap making.  I have mainly been using SoapQuick from Mission Peak Soap in Fremont and was wondering how I can resize it and still use imperial measurements.  I did find this posting from The Soap Queen called How to Resize Cold Process Soap Recipe discusses this by using a Lemon Poppyseed recipe.