Calculator
What is idle OR time costing your center?
Enter your center’s numbers. The calculator shows your annual staffed OR hours, how many sit idle at your current utilization, and what recovering five or ten points would mean in cases and revenue.
Your center
+10 points over current
Today
- Staffed prime-time OR hours / year
- 8,000
- Idle prime-time hours / year
- 2,800
At 75% utilization
- Recovered OR hours / year
- 800
- Additional cases / year
- 533
- Additional annual revenue
- $1,332,500
Estimate from your inputs, not a guarantee of results. Same rooms, same staffed hours — the revenue case for treating idle prime time as an asset.
How the math works
Annual staffed OR hours = operating rooms × prime-time hours per day × operating days per year. Your current utilization percentage determines how many of those hours hold cases; the rest are idle prime time. Recovered hours at a target utilization are converted into cases using your average case length (including turnover), and into revenue using your average net revenue per case.
Choosing accurate inputs
- Utilization: use case time against staffed prime-time hours — not against booked hours. The industry typically runs 60–65% on this measure; see our benchmarks page for context.
- Case length: include turnover. A 60-minute procedure with a 30-minute turnaround consumes 90 minutes of room time.
- Revenue per case: use net revenue (expected reimbursement), not charges. Your case mix drives this heavily, so a blended average is a starting point, not a forecast.
This is a planning estimate, not a promise — real recovery depends on demand, case mix, and how the recovered hours get filled. The playbook for actually moving the number is in the operator’s guide to OR utilization.
Design partner program
Recovering those hours is exactly the job Perivanta is built for
Duration forecasting, block release, cancellation backfill, and the staffing to match — one intelligence layer, built with founding centers now.