@$##@% Heads!

formula would be as follows (T*L) divided by (L+E)= X


T= torque spec you are trying to achieve
L= Torque wrench lengh centerline of square drive to centerline of handle grip
E= center line of square drive in crows foot to center line of wrench end
X= actual torque you will be measuring with torque wrench

Now that we got that as clear as mud, lets do an example: so you need to torque a fastner to 200 inch pounds. the lenght of your torque wrench is six inches (thats what she thinks anyhow and you're not about to correct her are you). your crows foot measures three inches (poor littl' guy)
so we go 200*6 (1200) divided by 6+3 (9) = 133.3 inch pounds

so now we can all get are crows feet out and torque are middle intake bolts with confidence! .. Or you can go to German spec and make everything Guedantight and spends the extra hour, and half dozen brain cells on a nice cold beer !