By definition, "calibrated airspeed" is indicated airspeed, corrected for position and installation errors (i.e., errors that result from the position of the pitot and static system in the changing flow field as a result of varying angle of attack & configuration; as well as error that result from the physical installation of the lines, etc.).
The POH/AFM of your aircraft will have a chart allowing you to determine the calibrated airspeed, given an indicated airspeed and configuration.
Once you have determined the calibrated airspeed, you may use that to calculate true airspeed...in faster aircraft, the calibrated airspeed is first used to calculate equivalent airspeed, then true airspeed. There is a mnemonic, "ICE-T" which stands for "indicated - calibrated - equivalent - true," which gives the order in which you proceed. Below about 180 knots, equivalent airspeed may be omitted, as the effect of ram temperature rise is negligible...so for the typical trainer or light twin, the order becomes "indicated - calibrated - true."