An electronic torque wrench calibration method includes providing test rod for simulating wrench body and support plate for simulating hand grip wherein on either side of the support plate there are provided at least two test points and an intermediate reference point; securing sensor to a stress gauge; placing two weights on the reference points and setting a count to one; recording torque as standard value; placing a weight on a respective one of the test points; recording torque as test value; comparing the test value with the standard value and obtaining an error; increasing bores of the adjustment holes if the error is greater than one prior to looping back to weight placing step; and ending the method by determining whether a predetermined count has been reached, and otherwise placing the weight on another respective one of the test points prior to looping back to test value recordation step.