According to one embodiment, a printing managing apparatus includes a log memory, an allowed amount memory, a counting unit, a calculating unit, and an output unit. The log memory stores, in association with user identification information, information indicating a sheet printed by an image forming apparatus according to an instruction of a user or information indicating a sheet discarded by the user. The allowed amount memory stores allowed amounts of sheets usable by users. The counting unit counts the number of un-discarded sheets among sheets printed by a certain user stored by the log memory. The calculating unit calculates a usage ratio of sheets from the number of un-discarded sheets counted by the counting unit and the allowed amount of sheets for the user stored by the allowed amount memory. The output unit outputs information including the usage ratio of sheets calculated by the calculating unit.