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In this study, experimental and statistical analyses were conducted to determine the relationship between the direct and indirect tensile strength values of rocks used as a natural building stone. Brazilian disc method, 3 and 4-point bending tests were chosen as indirect methods. In addition to the tensile tests, some physico-mechanical properties of the rocks were determined in order to perform multiple regression analysis. According to the analysis, it was concluded that the statistical models including P-wave velocity values are the models that best estimate the uniaxial tensile strength. New empirical formulas have been proposed using P-wave velocity and indirect test results. When the Vp was used and thickness/Diameter ratio was set to 1.0 in the Brazilian tensile strength (BTS) test, the coefficient of determination (R2) value of the model was found 98.7%. In 3-point bending strength tests performed in accordance with EN standard, the R2 value of statistical model including the Vp was found 92.6%. In the 4-point bending strength tests, the most suitable dimension was found to be 25x50x150 mm and the R2 value of the model was found to be 92.8%. As a result, the best regression model including BTS and Vp values was proposed to estimate the TS of rocks.