Nowadays, increasing competition in apparel industry forces the firms to produce with optimum costs. Even minimum increase in costs leads to important results. Sewing threads which is one of the most used auxiliary materials in apparel industry is also an important expense item. In this study it was aimed to calculate the amount of consumed sewing thread for the woven fabrics with different thicknesses. In accordance with this purpose, the chosen woven fabrics which are sewn with two different stitch types (lockstitch and three-thread overedge stitch) and 3 different stitch densities (3, 4 and 5 stitch/cm) has been researched for the sewing area of 10 cm in length. In this study the most commonly used sewing thread (150 dtex * 2 polyester-polyester core-spun thread), stitch types (lock stitch and three-thread overedge stitch) and fabric type (100% cotton woven fabrics) are used. Data taken from this study were investigated statistically for two stitch types and a relation is observed between the amount of consumed sewing threads with fabric thickness and stitch density. And a regression equation was developed with these parameters. In terms of these data, a software which uses the information of fabric thickness, sewing length, order quantity and the stitch density for lockstitch type or three-thread overedge stitch type in order to calculate the amount of consumed sewing thread and number of bobbins was developed.