Murwell Law

U.S. Federal Prison Good Time Sentence Calculator

Sentence/Term of Imprisonment
Only Whole Numbers
Only 0 to 31
See Good Time
Good Time


After deducting the good time credit, the remaining sentence is days or months or years.

U.S. Federal Sentencing Guidelines Calculator

Now that you've seen how easy it is to figure out the good time credit, how about checking out a fast, free way to calculate the federal sentencing guidelines for drug offenses. Role in the offense, safety valve included. Only want to see how much time one gets for multiple drug types? The Murwell calculator will do that too.
Guidelines Calculator

BOP Sentence Computation Manual

Want to see how the BOP actually calculates the good time credit? BOP Program Statement 5880.28 is the United States Bureau of Prisons' Sentence Computation Manual. You can get it here for free.
BOP Manual

About Good Time Calculator

Fast, quick way to get the good time credit a federal inmate can receive from the BOP. The sentence must be longer than one year to receive any good time credit. See 18 U.S.C. §3624(b)(1). Merely using 54 days per year, does NOT work. The BOP's convoluted method to determine good time credit was upheld by the U.S. Supreme Court in Barber v. Thomas.
It is likely that the sentence calculated here will vary from the official calculations done by the Federal Bureau of Prisons. You can read about the methodology we use here.
Disclaimer. There is No guarantee or warranty as to the accuracy of these applications. Use them at your own risk. This website does Not provide legal advice. Contact a lawyer for legal advice.
If a mistake is noticed or you have a comment regarding the application, please send an email.

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