Free tool
Bed occupancy rate calculator
Bed occupancy rate is the share of your available bed-days that were actually occupied by inpatients over a period. Enter your numbers below — the calculator updates as you type, and already shows a worked example.
Bed occupancy rate = total inpatient bed-days ÷ (number of beds × days in the period) × 100. A hospital with 50 beds running 1,050 inpatient bed-days in a 30-day month is at 70% occupancy.
- Formula
- Bed-days ÷ (Beds × Days) × 100
- Needs
- Beds, days in period, total inpatient bed-days
- Related
- ALOS, bed turnover, census
Calculator
1,050 inpatient bed-days out of 1,500 available bed-days.
The formula
Bed occupancy rate expresses how much of a hospital's available bed capacity was actually used over a period, as a percentage:
Bed occupancy rate (%) = Total inpatient bed-days ÷ (Number of beds × Days in period) × 100
"Inpatient bed-days" is the total number of days beds were occupied by patients over the period — add up each patient's length of stay within the period, or count occupied beds at the same time each day and sum those counts. "Number of beds" should be the beds actually staffed and available for use, not a licensed or sanctioned bed count that includes beds you can't currently run.
Worked example
A 50-bed ward runs for a 30-day month, available bed-days work out to 50 × 30 = 1,500. If the ward logged 1,050 inpatient bed-days over that month, occupancy is 1,050 ÷ 1,500 × 100 = 70% — the same numbers the calculator above starts with.
Getting the inputs right
Most occupancy errors come from the numerator, not the formula. If you're totalling each patient's length of stay, decide up front how you'll treat a patient who is still admitted at the end of the period — you can only count the days that actually fall inside the period, not their full eventual stay. If you're counting occupied beds at a fixed time each day instead (a midnight census, for example), make sure you're not double-counting a bed on the day a patient is discharged and a new patient is admitted into it — decide on one convention and apply it consistently, since it's the comparison over time that matters more than the exact method. And keep the denominator honest: a ward that has taken beds out of service for renovation or staffing reasons should use the beds it actually ran that period, not its full sanctioned capacity, or occupancy will read artificially low.
How to read the result
Occupancy is most useful watched over time for the same hospital or ward — a rising or falling trend tells you more than a single month's number. Two wards can run the same occupancy rate for very different reasons: one from steady admissions, another from a few patients staying unusually long (see ALOS calculator), so it's worth reading occupancy and length of stay together rather than occupancy alone. There isn't one universal "ideal" occupancy figure that applies to every hospital — what counts as comfortably full or dangerously stretched depends on your bed mix, specialty and local demand, so this page doesn't attempt to name one.
Census, ALOS and bed occupancy — computed automatically
Official references
- Bed occupancy rate, acute care hospitals only — indicator definition ↗WHO Regional Office for Europe, European Health Information Gateway
Rules change. Confirm current requirements with the issuing authority.
Related
More on hospital capacity and length of stay.