Accuracy of hot-rolled products dimensions is one of main indices of quality and along with strength and structure metal characteristics, determines quality and competiveness of the hot-rolled products. Increase of rolling accuracy enables to make the rolled products in “minus” area of tolerance and to save metal at the expense of a profile running metre mass decreasing. It is possible only at rolling in accurately calculated finishing passes, manufactured according to adjusted rolling accuracy and with outlets of optimal form. Analysis of calibration efficiency application accomplished, the calibration being of “oval–circle” version with application of three-radius construction of reducing-sizing block round passes of wire rod rolling mill at production of 5.5 mm diameter wire rod. A numeral model elaborated for production of 5.5 mm diameter wire rod at a wire-rod mill using a base sizing “oval–circle”. To study geometric dimensions of 5.5 mm diameter wire rod, manufactured at 150 mill with application of “oval– circle” base sizing, samples of 80K steel were collected. The selection was done out of the head and of the tail of a coil. Based on energy-power data and speed parameters of a real rolling process, a mathematic model of 5.5 mm diameter wire rod rolling with application “oval–circle” base sizing was constructed. Wire rod mill 150 finishing gages form optimization was accomplished aimed at an increase of geometric dimensions of final profile accuracy. Analysis of efficiency of multi-radius cutting of finishing stands rolling passes was done for production of 5.5 mm diameter wire rod.