I just tried findlotsize.com. It's the same base as Google's Daft Logic, just dressed a little differently Either one will work. Daft Logic gives you more information and options, findlotsize appears to be a dumbed up version that is easier to learn.
Which ever one is easier for you to use is the one to go with.
"Thanks dad, you gave me courage, wisdom, honesty and strength. I will truly miss you, my friend."