Disclosed is a method for measuring the available remaining hydrogen capacity of a non-replaced hydrogen storage canister. After the original hydrogen capacity of the hydrogen storage canister is read, the used hydrogen capacity of the hydrogen storage canister is read and remaining hydrogen capacity formula is employed to determine the available remaining hydrogen capacity of the hydrogen storage canister. For a fully charged or newly-installed hydrogen storage canister, the process includes reading the number of cycles of operation of the hydrogen storage canister, reading the original hydrogen capacity of the hydrogen storage canister, reading the used hydrogen capacity of the hydrogen storage canister, and then employing the remaining hydrogen capacity formula to determine the available remaining hydrogen capacity of the hydrogen storage canister.