1. Measure your torque wrench from center of adapter drive to where you will apply force (center of hand location), this is = L.
2. Measure from center of torque wrench adapter drive to center of tool extension (reduction) adapter, this is = E.
3. Determine desired torque applied to fastener or whatever, this is equal to T.
4. Enter numbers press "Update".
Indicated Torque (Y) is what your torque wrench should read to achieve the desired applied torque.