The sentence for armed robbery depends on the laws of the charging state, and the punishment varies from five years in prison to life in prison, as explained by FreeAdvice. Another sentencing factor is if the state considers the armed robbery to be aggravated robbery.
Most states have harsh punishments for aggravated robbery, notes Nolo, which means that dangerous weapons or firearms are used in committing the crime. This detail makes it worse than a simply robbery and usually means a tougher sentence depending on the state. Another factor in sentencing is if a death or injury is caused as the result of the armed robbery.