The volume of compacted clay soil specimens at the as-compacted and swollen states can be accurately determined using average vernier caliper measurements. Whereas, the volume of compacted clay soil specimens at desiccated state can only be determined if the desiccation cracks within the specimens are accurately quantified. Though the mercury displacement method can be used for the determination of the volume of desiccated clay soil specimens without the inclusion of the volume of cracks, this method suffers from major limitations like usage of hazardous material and destructive testing of small-sized specimens which should be discarded immediately after testing. Recent studies have shown that the desiccation cracks inside the desiccated clay soil specimens can be quantified with the assistance of images acquired from the digital camera (DC) and X-ray computed tomography (XCT) experiments, which are non-destructive. In this paper, the cracks inside the desiccated clay soil specimens are quantified and the volumetric deformations of compacted clay soil specimens during and at the end of different drying processes calculated using various methods are presented and compared. The methods include vernier caliper average dimension measurements, mercury displacement method, and different available methods utilizing the DC and XCT images along with vernier caliper average height measurements are presented and compared.