Calculate adjusted patient days and cost per adjusted patient day from inpatient days, gross inpatient and outpatient revenue, and total operating cost.
Methodology note: Adjusted patient days use the gross patient-revenue ratio method: inpatient patient days × total gross patient revenue ÷ gross inpatient patient revenue. Keep all inputs within the same facility scope and reporting period.
Cost Per Adjusted Patient Day Formula
This calculator uses the gross patient-revenue method for adjusted patient days. Adjusted days estimate inpatient-day equivalents of combined workload, rather than actual outpatient visits or days:
Adjusted patient days = inpatient patient days × (total patient revenue ÷ inpatient patient revenue).
Because total patient revenue equals inpatient plus outpatient patient revenue, the same relationship can be written as inpatient patient days × [1 + (outpatient patient revenue ÷ inpatient patient revenue)].
Cost per adjusted patient day = entered cost numerator ÷ adjusted patient days.
Required Reporting Consistency
All four inputs must use the same organization or facility scope and the same reporting period. Patient revenue is not the same as cash collections. For the revenue-ratio method shown here, use gross inpatient and gross outpatient patient revenue on the same basis; exclude nonpatient revenue. Do not mix gross revenue, net revenue, or cash collections. The standard operating-cost metric uses total operating expenses; if another cost category is entered, identify it explicitly and keep it consistent across comparisons.
Example
If inpatient patient days are 10,000, inpatient patient revenue is 40 million, and outpatient patient revenue is 20 million, adjusted patient days equal 15,000. A cost numerator of 12 million produces 800 cost units per adjusted patient day.
Administrative-use limitation: This calculator does not determine reimbursement, accounting treatment, or financial performance. Confirm definitions against the reporting framework used by your organization.
