Not sure how this site works? I have written up a detailed set of instructions on the Samurai Siege forums just go here!
Calculation Inputs
Updated to fix C11 vs C8 wp loss (now correctly 208) 11/11/2015. Please let me know of any errors the Kami tree change was a bit messy
Current War Points DD War Point Sync Target

Select the castle levels you wish to exclude from the calculation
Exclude Castles this Level and Below: Exclude Castles this Level and Above:
For example, if you wanted to only include attacks/losses on castles 5, 6, 7, and 8. You would select 4 for 'Exclude Castles this Level and Below'
and you would select 9 for 'Exclude Castles this Level and Above'.