Using a torque wrench with an extension or adapter? You need to adjust the torque setting to apply the correct force. This calculator helps you determine the actual torque applied to the fastener when using an extension.
How to Use the Calculator
Follow these steps to calculate the adjusted torque:
- Enter the torque wrench setting in Newton-meters (Nm).
- Enter the lever arm length in centimeters (cm). This is the distance from the center of the wrench drive to the handle pivot.
- Enter the extension length in centimeters (cm). This is the additional length from the drive to the fastener.
- Click “Calculate Adjusted Torque” to get the correct applied torque.
Use this tool to ensure you apply the correct torque, preventing over-tightening or under-tightening of fasteners.
Torque Wrench Calculator
Why Is Torque Adjustment Important?
When you use a crowfoot wrench, torque adapter, or extension, the added length changes the leverage, affecting the actual force applied. If not adjusted, you could over-tighten bolts, leading to damage or failure.
Formula Used
The calculator uses the following formula:
T_A = T_W × (L / (L + E))Where:
- T_A = Adjusted Torque (Actual torque applied to fastener)
- T_W = Torque Wrench Setting
- L = Lever Arm Length (Distance from drive center to handle pivot)
- E = Extension Length
Additional Notes
✔ If the extension is **perpendicular** to the wrench, no adjustment is needed.
✔ Always double-check manufacturer specifications for exact torque values.
✔ Use a calibrated torque wrench for accurate results.