In recent years, the benefits of applying Building Information Modeling (BIM) to support quantity takeoffs have been significantly recognized. Autodesk Revit is one of the most popular software packages adopted for quantity takeoffs. Autodesk QTO is another easily-accessible package that can be combined with Revit to facilitate quantity takeoffs. Whether or not to combine with QTO remains questions to be answered. The objective of this study is to compare the two quantity takeoffs methods, namely, ＂only-Revit＂ and ＂Revit-with-QTO＂. The results show that the only-Revit method has restrictions in filtering quantity takeoff items and in setting quantity takeoff formulas. Moreover, the quantity takeoffs of a particular cost item (e.g., concrete) associated with each BIM object (e.g., column or beam) are generated separately, thus requiring further effort to sum up those individual results. On the other hand, the Revitwith- QTO method can obtain the total quantities of a cost item associated with all BIM objects in one time, thus facilitating its favorable integration with a cost estimation software package (e.g., PCCES). However, if the BIM model is revised, the Revit-with-QTO method requires to convert the BIM model to QTO again and repeat the quantity takeoffs process. Lastly, this study indicates that both method fail to produce a quantity takeoff report (required for all public construction projects) for double-checking its calculation process. This finding implies that applying BIM to support quantity takeoffs still needs further improvement.