1. An image forming apparatus comprising: an image forming unit which forms a toner image by visualizing an electrostatic latent image with a toner; and a toner-consumption calculator which calculates an amount of toner consumed for forming the toner image, wherein the toner-consumption calculator calculates the toner consumption based on information on a distance between toner dot portions which are included in the electrostatic latent image and to which the toner is made to adhere.