This calculator will determine the actual torque applied when using a adapter that reduces the torque arm length on your torque wrench. See above link for proof and description of variables.
How to use this calculator:
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.
Equation for Torque Wrench Adapter:
Torque Wrench Adapter Reduction Arm Equations and Proof
Make sure adapter is configured as shown on torque wrench illustration.
Preview Torque Wrench Adapter - Reduction Indicated Torque Calculator
Units: Keep all your units consistant, e.g. lb-in with in and N-M with M