This paper presents the experiment implementation of dilatometer Marchetti test (DMT) in definition of grain size distribution and present changes in the way the interpretation of these paper in the late years. The paper interpreted the results of the Marchetti dilatometer tests at the Campus of Warsaw University of Life Sciences SGGW, Stegny and Warsaw II Subway Line. Based on the laboratory test results, the grain size distribution was applied on a triangle in accordance with the Polish standard PN-86/B-02480 and European standard PN-EN ISO 14688-1, PN-EN ISO 14688-2 and the grain size distribution. The main advantage of this paper is the author’s suggestion that the nomogram will be used to determine the grain size composition of soil on the basis of DMT tests.

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