Duct leakage often needs to be measured to demonstrate compliance with codes and standards requirements or to determineenergy or indoor air quality impacts. There are several test methods available and documented in standards. Repeatability errorsneed to be understood because standards and codes need consistent evaluation procedures and because repeatability is also anindication of the resolution of the test method. This study focused on those test methods that are commonly used and are requiredby various organizations such as BPI, ACCA, RESNET, DOE Weatherization, and many other energy efficiency programs andin various test standards such as ASHRAE Standard 62.2 and ASHRAE Standard 152, and California Title 24. The three ductleak measurement methods assessed were two duct pressurization methods that are commonly used by many practitioners andthe DeltaQ technique. This study assessed each measurement technique using data from the literature and recently obtained fielddata. The field data were taken in 30 homes in three locations in the U.S. Each home was tested multiple times with each measurementtechnique. The results of this study can be used by organizations such as BPI, ACCA, RESNET, ASHRAE, and other buildingcodes and standards in determining what tests are appropriate for their specific application.