Each 1 percentage point of occupancy equals
How this bed occupancy rate calculator works
Bed occupancy rate compares the bed days admitted patients actually used with the bed days your operational beds could have provided in the same period. It tells you how much of your inpatient capacity was used, which is why it is reviewed daily for operations and monthly for finance.
Bed occupancy rate = (Occupied bed days ÷ Available bed days) × 100
Available bed days = Available beds × Days in the period
Occupied bed days are usually the sum of the daily midnight census: the number of admitted patients in a bed at midnight, added up for every day of the period. If you only know your average midnight census, multiply it by the number of days. The calculator also shows average occupied beds (occupied bed days ÷ days) and empty bed days (available bed days − occupied bed days).
Bed occupancy rate formula with example
A 150-bed hospital has 10 beds closed for renovation, so it has 140 operational beds in a 30-day month. Its daily midnight census adds up to 3,150 occupied bed days.
| Step | Calculation | Result |
|---|---|---|
| Available bed days | 140 × 30 | 4,200 |
| Occupied bed days | Sum of daily midnight census | 3,150 |
| Bed occupancy rate | 3,150 ÷ 4,200 × 100 | 75% |
| Average occupied beds | 3,150 ÷ 30 | 105 |
| Empty bed days | 4,200 − 3,150 | 1,050 |
Each percentage point of occupancy in this example is 42 bed days a month (1% of 4,200), or 1.4 more occupied beds on an average day.
Bed occupancy rate per month
To calculate bed occupancy rate per month, use the number of days in that month and the occupied bed days recorded in that same month. A 100-bed hospital in a 31-day month has 100 × 31 = 3,100 available bed days. If the month’s midnight census adds up to 2,480 occupied bed days, monthly bed occupancy is 2,480 ÷ 3,100 × 100 = 80%. Keep both numbers for the same period; mixing a month’s census with a different number of days will distort the rate.
What is a good bed occupancy rate?
There is no single ideal occupancy for every hospital. A consistently low rate can point to weak demand, poor referral conversion or service gaps. A consistently very high rate can mean crowding, discharge delays and no room for emergencies. ICU, maternity, paediatrics and elective surgery beds have different demand patterns, so review them separately, and compare your own trend over time before comparing with other hospitals.
Common mistakes in occupancy reporting
- Counting sanctioned beds instead of operational beds, which makes occupancy look weaker than reality
- Including OPD or day-care patients in occupied bed days without defining them consistently
- Combining ICU, ward, maternity and day-care beds into one number that hides where the pressure is
- Using a month’s census with a different number of days in the denominator
Related calculators and guides
For definitions, levers to improve occupancy and dashboard ideas, read the full bed occupancy rate formula guide and the ALOS guide.
Frequently asked questions
What is BOR in a hospital?
BOR is the full form of Bed Occupancy Rate (sometimes called bed occupancy ratio). It is the percentage of a hospital’s available inpatient bed days that were actually used by admitted patients in a period.
What is the bed occupancy rate formula?
Bed occupancy rate = (Occupied bed days ÷ Available bed days) × 100, where available bed days = available beds × days in the period. Use the same period for both numbers.
What is the bed occupancy rate formula with example?
A hospital with 140 operational beds in a 30-day month has 140 × 30 = 4,200 available bed days. If it records 3,150 occupied bed days, its bed occupancy rate is 3,150 ÷ 4,200 × 100 = 75%.
How do you calculate bed occupancy rate per month?
Multiply available beds by the days in the month to get available bed days, then divide the month’s occupied bed days by that number and multiply by 100. For example, 100 beds in a 31-day month give 3,100 available bed days; 2,480 occupied bed days means 80% occupancy.
How do I calculate occupied bed days?
Add up the number of admitted patients in beds at each daily midnight census across the period. If you only know the average midnight census, multiply it by the number of days in the period.
What is a good bed occupancy rate for a hospital?
There is no single ideal rate. Many hospitals aim for a range that keeps beds productive without crowding, but the right level depends on specialty mix, emergency load and staffing. Very high occupancy can delay admissions and stretch nursing teams.
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