Disclosed is a system for a weapon sight for aiming a target. The system includes a controller unit configured to initiate an electronic zoom calibration mode, locate a red dot of a day view optic, cause a line of sight to the target unperturbed, electronically superimpose a reticle of the weapon sight onto a thermal image of the target, store information corresponding to a location of the reticle when the reticle is allowed to coincide with the located red dot, and write a pixel corresponding to the stored information of the location of the reticle to a pixel written corresponding to a location of the reticle in a non-electronic zoom mode. The system also includes a memory unit communicably coupled to the controller unit. Further disclosed are a weapon sight and a method for aiming a target using electronic zoom calibration.