An image forming apparatus includes: an image forming unit; a first sheet discharging path having a first dischargeable minimum sheet length; a second sheet discharging path having a second dischargeable minimum sheet length that is shorter than the first dischargeable minimum sheet length; a measuring unit that measures a length of the sheet; and a control unit. When the length of the sheet is shorter than the first dischargeable minimum sheet length in a state in which the first sheet discharging path is selected, the control unit is configured to: control the image forming unit to form the image on the measured sheet; convey the measured sheet downstream in a sheet conveying direction from the image forming unit; and stop conveyance of a sheet subsequent to the measured sheet at a position upstream in the sheet conveying direction from the measured sheet.