This disclose sets forth methods and devices for calculation of uplink transmission power. An indication of a non-contiguous allocation of resource blocks for an uplink transmission is received. A first additional maximum power reduction (“A-MPR”) is determined based on a smallest contiguous allocation containing the non-contiguous allocation and an allocation correction factor. A second A-MPR is determined as a non-contiguous resource allocation A-MPR for the non-contiguous resource allocation. An uplink transmission power is calculated based on a lesser of the first A-MPR and the second A-MPR. The uplink transmission is performed based on the uplink transmission power.