PRTCalc is a free utility for those involved with PT100 platinum resistance thermometers. It allows for the accurate conversion of resistance to temperature or temperature to resistance. PRTCalc conforms with IEC 751 Amendment 2: December 1995. PRTCalc also knows the values for the earlier issue of IEC 751.

The user may enter custom coefficients to suit individual probes. Probe specific calculations can then be performed with all entered data available stored alongside a tag name for the platinum resistance thermometer supplied