The maturity concept is a basic method to estimate the strength depending on time and temperature. Maturity index, which is a factor for determining the hardening, is used as a non-destructive inspection method for estimating the concrete strength. The method assures a relatively simple approach to make more reliable estimates of in situ strength during construction. However, in order to apply the maturity, during the construction some tests should be carried out to obtain the properties of concrete before initiating the production. Here within, the variation of maturity with different cements was examined. For this reason, two different cements were used. The specimens produced were cured in three different temperatures (0, 23 and 40 degrees C) for 1, 3, 7 and 28 days. The compression tests were applied on the specimens at the end of the curing time. Equations for the relationship between maturity and strength were developed for the cements used in the study.