Jail time for armed robbery generally runs from five years to life, and where a sentence lands depends on the court, the weapon, and whether anyone was hurt. In federal court the average robbery sentence is about 110 months, roughly nine years, and it climbs to 162 months when a firearm enhancement is attached to the conviction. State sentences for comparable conduct usually fall somewhere in a 5-to-25-year statutory range, with life available in the most serious cases. Federal inmates cannot be paroled, so the number the judge announces is close to the number actually served.
The Federal Charges Behind an Armed Robbery Case
Federal law does not have a single crime called armed robbery. Prosecutors pick a statute based on what was robbed and where.
Bank robbery under 18 U.S.C. § 2113 covers theft from any federally insured bank, credit union, or savings institution. A plain bank robbery carries up to 20 years. Using a dangerous weapon or putting a life in jeopardy raises the maximum to 25 years. If someone is killed or kidnapped during the robbery, the minimum is 10 years and the maximum is life or death.1Office of the Law Revision Counsel. 18 U.S.C. 2113 – Bank Robbery and Incidental Crimes
Hobbs Act robbery, 18 U.S.C. § 1951, reaches any robbery that affects interstate commerce, and federal prosecutors read that reach broadly. A convenience store holdup can qualify because the store stocks goods that crossed state lines. The maximum is 20 years.2Office of the Law Revision Counsel. 18 U.S.C. 1951 – Interference With Commerce by Threats or Violence
How a Gun Adds Mandatory Consecutive Time
The single biggest driver of a long armed robbery sentence is 18 U.S.C. § 924(c), a firearm enhancement that stacks on top of the underlying robbery sentence. Its time cannot run concurrently with the robbery time. It runs after.3Office of the Law Revision Counsel. 18 U.S.C. 924 – Penalties
The mandatory minimums step up with what the defendant did with the gun:
- Carrying or possessing a firearm during the robbery: at least 5 additional years.
- Brandishing it: at least 7 additional years.
- Discharging it: at least 10 additional years.
- A second or later 924(c) conviction: at least 25 additional years.
Probation is off the table under this statute, and the mandatory floor cannot be reduced except in narrow circumstances. About 40 percent of federal robbery defendants are also convicted under 924(c), and those defendants receive an average sentence of 162 months versus 76 months for robbery defendants without the enhancement.4United States Sentencing Commission. Robbery Offenses
The realistic ceiling gets high fast. A Hobbs Act robbery where the defendant brandished a gun exposes the defendant to up to 20 years on the robbery count plus a mandatory 7 consecutive years for the firearm, so 27 years before any other adjustment.
How the Sentencing Guidelines Produce the Number
Federal judges start with the U.S. Sentencing Guidelines. Robbery begins at a base offense level of 20, then moves up based on what happened during the crime.5United States Sentencing Commission. Primer on Robbery Offenses
The adjustments that matter most in armed robbery cases:
- Firearm discharged: +7 offense levels.
- Firearm otherwise used: +6.
- Firearm brandished or possessed: +5.
- Permanent or life-threatening bodily injury: +6.
- Serious bodily injury: +4.
- Bodily injury: +2.
- Threat of death: +2.
The adjusted level is then cross-referenced against the defendant’s criminal history category to produce a range in months. A first-time offender at level 20 faces roughly 33 to 41 months. Adding a firearm discharge pushes the level to 27, where the range climbs to 70 to 87 months. A defendant with a heavy record at that same level can easily see triple-digit months under the guidelines alone, before any consecutive 924(c) time is layered on.5United States Sentencing Commission. Primer on Robbery Offenses
Armed Robbery in State Court
Most armed robberies are prosecuted in state court, not federal court. Nearly every state treats armed robbery as a high-level felony with a statutory range typically spanning 5 to 25 years. Some states set mandatory minimums in the 5-to-10-year range when a firearm is involved; others leave judges more room.
State sentences tend to run somewhat lower than federal ones for similar conduct, partly because many states still offer parole and partly because the consecutive federal firearm add-on has no automatic state equivalent. Even so, armed robbery involving serious injury or a prior record commonly draws 20 years or more, and a handful of states authorize life for the most violent cases.
Repeat Offenders and Life Sentences
Federal law imposes mandatory life on anyone convicted of a third serious violent felony, and robbery is expressly listed as a qualifying offense. Certain serious drug crimes count toward the same threshold, so two prior convictions in any qualifying combination can lock in a life sentence on the third strike.6Office of the Law Revision Counsel. 18 U.S.C. 3559 – Sentencing Classification of Offenses
Many states have their own three-strikes or habitual-offender laws that follow the same pattern: each prior violent conviction increases the penalty, and a third or fourth can trigger life or a term measured in decades. Armed robbery almost always qualifies as a strike because of the violence built into the offense.
How Much of the Sentence You Actually Serve
Federal prison time is not shortened by parole. Congress abolished federal parole in 1984, and the system runs on a truth-in-sentencing model. The only reduction available to most federal prisoners is good-time credit of up to 54 days per year for maintained good behavior, which works out to about a 15 percent reduction. Most federal prisoners serve at least 85 percent of the sentence imposed.7Office of the Law Revision Counsel. 18 U.S.C. 3624 – Release of a Prisoner
A 10-year federal armed robbery sentence therefore means about eight and a half years behind bars at minimum. The mandatory minimum portion of a 924(c) enhancement cannot be shaved down by good-time credit either. State systems vary: some allow parole eligibility after a third or half of the sentence, while others mirror the federal 85 percent floor.
Ways the Sentence Can Come Down
Not every defendant gets the maximum. A few mechanisms can bring the number lower, though none are guaranteed.
Plea bargains carry the biggest share of the work. The vast majority of federal criminal cases end in a plea agreement, not a trial. A defendant may plead to a lesser charge, such as simple robbery instead of armed robbery, or agree to a specific sentence range in exchange for giving up trial rights. Prosecutors often prefer the certainty.
Substantial assistance is the primary path below a mandatory minimum. If the defendant provides information that helps the government build cases against others, prosecutors can file a motion asking the judge to sentence below the statutory floor. Only the government can file that motion, and the judge decides how far below to go.8United States Sentencing Commission. Substantial Assistance Report
Other mitigating factors can move a sentence within the guideline range: age, mental health history, role in the offense (a lookout is not the person holding the gun), and acceptance of responsibility. Judges also retain authority to depart from the guidelines when the recommended range does not reflect the individual case.
Juveniles Are Handled Differently
Juvenile defendants accused of armed robbery are usually kept in juvenile court, where dispositions lean toward detention in a youth facility, probation, counseling, and community service rather than long prison terms. That protection ends when a prosecutor moves to transfer the case to adult court, or when a state’s automatic transfer law sends certain violent offenses to adult court for teenagers above a set age, often 16 or 17. Once tried as an adult, the juvenile faces the same mandatory minimums and guideline math as any other defendant.