Probation vs. Incarceration Cost Comparator
Compare the total taxpayer cost of supervising an individual on probation versus incarcerating them, based on sentence length and jurisdiction-specific daily rates.
National average ≈ $110/day (state prison). Enter your jurisdiction's figure.
National average ≈ $10.50/day. Enter your jurisdiction's figure.
Fees offset government cost. Enter 0 if unknown or not applicable.
Formulas Used
Total Days = Months × 30.4375 (365.25 ÷ 12)
Gross Incarceration Cost = Daily Incarceration Rate × Total Days
Gross Probation Cost (govt.) = Daily Probation Rate × Total Days
Fee Offset = Monthly Supervision Fee × Months
Net Probation Cost (govt.) = max(0, Gross Probation Cost − Fee Offset)
Savings (Probation vs. Incarceration) = Gross Incarceration Cost − Net Probation Cost
Cost Ratio = Gross Incarceration Cost ÷ Net Probation Cost
Aggregate Cost = Per-Person Cost × Number of People
Assumptions & References
- Default daily incarceration cost of $110/day is based on the Vera Institute of Justice (2023) national average for state prisons (~$40,150/year).
- Default daily probation cost of $10.50/day (~$3,800/year) reflects the Bureau of Justice Statistics and Pew Charitable Trusts estimates for community supervision.
- A calendar month is treated as 30.4375 days (365.25 ÷ 12) to account for leap years.
- Supervision fees paid by the probationer directly offset the government's net cost; the calculator caps net probation cost at $0 (fees cannot produce a negative government cost).
- Costs shown are direct operational costs only. Excluded: capital/construction costs, healthcare, mental health treatment, reentry services, victim services, and lost tax revenue.
- Actual costs vary significantly by state, county, facility type (jail vs. state prison vs. federal), and supervision intensity (standard vs. intensive probation).
- Sources: Vera Institute of Justice — The Price of Prisons (2023); Pew Charitable Trusts — Probation and Parole Systems Marked by High Stakes, Missed Opportunities (2018); Bureau of Justice Statistics — Probation and Parole in the United States (2022).