A method for calibrating a toner concentration sensor may include obtaining a zero % TC reading from the toner concentration sensor using a carrier material, determining an estimated TC intercept, and adjusting the toner concentration sensor based on the estimated TC intercept. An apparatus for calibrating a toner concentration sensor may include a toner concentration sensor that detects toner concentration of a developer mix in a developer cartridge and a toner concentration sensor controller that applies calibration to the toner concentration sensor. The toner concentration sensor controller mat include a toner concentration sensor reading section that obtains a zero % TC reading of the toner concentration sensor based on the carrier material, a toner concentration sensor correcting section that determines an estimated TC intercept, and an adjusting section that determines for the calibration for the toner concentration sensor based on the estimated TC intercept.

 
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