An image forming apparatus includes a developing device, a replaceable developing material container that contains developing material, a coupling member that couples the developing device to the developing material container, and a controller. The controller calculates a value obtained by calculating replacement time of the developing material container, on a developing material amount obtained by subtracting a developing material amount filled in the coupling member from a developing material amount contained in the attached developing material container, when the developing material container is attached and an installation sequence to fill the coupling member with developing material is performed. The image forming apparatus further includes a display that displays information indicating the replacement time of the developing material container based on the value calculated by the controller.