#### How to Measure V Belt Tension | It Still Runs

Step 4. Multiply that measurement by onesixtyfourth of an inch. If your belt is 16 inches, the equation is 1/64 x 16 = 16/64 or 1/4 of an inch. Set the "O" ring on the handle of your tension gauge to the measurement from your calculation. Set the second "O" ring on the plunger against the body of the tension gauge at the zero mark.