How is a federal prison release date calculated?
A federal release date is not set by the judge — the Bureau of Prisons computes it from the sentence imposed, in a fixed sequence: when the sentence commences (18 U.S.C. § 3585(a)), minus jail credit for qualifying pre-sentence custody (§ 3585(b)), minus up to 54 days per year of Good Conduct Time (§ 3624(b)). For people eligible under the First Step Act, earned time credits (§ 3632(d)(4)) then move the transfer to supervised release up to a year earlier and can add months of halfway house or home confinement before that. The result is a ladder of dates, not one date: full term, Good Conduct release, FSA-adjusted release, and a projected halfway-house or home-confinement transfer before any of them.
Reviewed against 18 U.S.C. §§ 3585, 3624, 3632 and BOP Program Statement 5880.28 (Sentence Computation Manual). Last updated .
What are the steps, in order?
- Commencement — the sentence starts when the person is received into official custody to begin serving it (§ 3585(a)), not at sentencing.
- Jail credit — qualifying days in official detention before the sentence began, not already credited elsewhere, come off the term (§ 3585(b) — details in jail credit).
- Full-term date — commencement plus the sentence imposed (multiple sentences are first aggregated into one computation under § 3584(c)).
- **Good Conduct Time** — up to 54 days per year of the sentence imposed comes off the full-term date, producing the statutory release date.
- **First Step Act credits** — for eligible people, earned credits move the transfer to supervised release up to 365 days earlier (§ 3624(g)(3)) and push halfway-house or home-confinement placement earlier still.
Worked example
60-month sentence, custody 2026-01-15, eligible and programming
- Full-term date: 2031-01-14.
- Good Conduct Time: 5 × 54 = 270 days → statutory release ≈ 2030-04-19.
- FSA credits toward supervised release (capped at 365 days) → release from BOP custody ≈ 2029-04-19.
- Additional FSA credits + Second Chance Act window → halfway house or home confinement months before that.
- Every date after the first is conditional — on conduct, programming, PATTERN level, and bed space.
Who actually calculates the release date?
BOP's Designation and Sentence Computation Center (DSCC) in Grand Prairie, Texas computes every federal sentence. The Supreme Court held in United States v. Wilson, 503 U.S. 329 (1992) that the Attorney General — through BOP — not the sentencing court, computes credit and release dates. Judges recommend; BOP computes. The governing manual is Program Statement 5880.28, and computation errors are corrected through the case manager or the administrative remedy process.
Why are there several different “release dates”?
| Date | What it is | Authority |
|---|---|---|
| Full-term (EFT) | Sentence with no credits at all | § 3585 |
| Statutory release (SRD) | Full term minus projected Good Conduct Time | § 3624(b) |
| FSA conditional release | SRD minus applied FSA credits (≤ 365 days) | § 3624(g)(3) |
| Prerelease transfer | Move to halfway house / home confinement | § 3624(c), (g) |
The BOP inmate locator shows only one of these (usually the statutory or FSA-adjusted date, depending on what has been applied), which is why the public site often disagrees with what the family expects — see why release dates change.
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The free OutDate calculator applies these rules to a real sentence — Good Conduct Time, First Step Act credits, halfway house and RDAP dates — with every assumption listed next to the answer. No account needed; nothing is stored.
Open the federal release date calculatorFrequently asked questions
Does the judge decide the release date?
No. The judge imposes a term of months; BOP computes commencement, jail credit, Good Conduct Time, and First Step Act credits to produce the release date (United States v. Wilson, 503 U.S. 329 (1992)). A judge's recommendation about placement or programs is not binding on BOP.
What percentage of a federal sentence is actually served?
With clear conduct, Good Conduct Time alone brings time served to about 85% of the sentence. People eligible for First Step Act credits who program consistently can serve closer to 60–70% in a prison facility, with part of the remainder in a halfway house or on home confinement. See the 85 percent rule explainer for the full arithmetic.
How soon after sentencing is the official computation done?
Typically within several weeks of arrival at the designated facility, once the Judgment and any pre-sentence custody records reach the DSCC. The person can request their Sentence Monitoring Computation Data printout from their case manager as soon as it exists — how to read it is covered in the computation-sheet guide.
Is there parole in the federal system?
Not for offenses committed on or after November 1, 1987 — the Sentencing Reform Act of 1984 abolished it. Release timing for modern federal sentences comes only from Good Conduct Time, First Step Act credits, RDAP early release, and prerelease custody.
Primary sources
Everything on this page is drawn from the statutes, regulations, and BOP program statements below — read them directly:
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Estimates, not promises
This page describes federal law and Bureau of Prisons policy in general terms for education. It is not legal advice, it doesn't account for the facts of any individual case, and no attorney–client relationship is created by reading it. The BOP makes all final release-date determinations. Have an attorney review anything before you file it. Built by OutDate, the federal release date calculator.