Feb 23
What Are Space Frequency, Occupancy And Utilisation Rates And How Do I Calculate Them?
Frequency, occupancy and utilisation are terms for measuring how well space (as in physical space, such as rooms) is being used. Each provides you with a different piece of information that helps you to understand how well your space (i.e. a room, a building, or even your institution) is being used and why.
The Space Management Group (SMG) , provides some useful definitions so lets start with these:
Frequency
Frequency – SMG Definition “The frequency rate measures the proportion of time that space is used compared to its availability”
This frequency definition outlines the two pieces of information you need to calculate a space’s frequency rate;
Space availability, is simply the length of time the space in question is available for use during the time frame you have selected. To help demonstrate this I am going to choose a teaching room as our example space and use a typical teaching week of Monday – Friday, 0918:00, 45 hours per week as the teaching room’s availability. Therefore the space availability in this example is 45 hours.
 Space availability
 How many times the space was used
Space availability, is simply the length of time the space in question is available for use during the time frame you have selected. To help demonstrate this I am going to choose a teaching room as our example space and use a typical teaching week of Monday – Friday, 0918:00, 45 hours per week as the teaching room’s availability. Therefore the space availability in this example is 45 hours.
Next, you need to find out how many times this space is used during these 45 hours. Typically this is done by physically checking the space every hour throughout the space availability, in this case MondayFriday 0918:00, recording whether the room is in use or not each hour. For this example’s purpose, lets say that you carried out this check and found out the room was in use during 30 of the 45 hours the space was available that week – see room check sheet below. You now have the information for part 2) How many times was the space used.
Now you have both both pieces of information you can calculate the frequency rate, to do this just divide the 2) how many times the space was used (30) by the space availability (45) and you get your space frequency rate – 66.67%. You now know that during the surveyed period the teaching room was used 66.67% of the time and therefore was empty, 33.33% of the time. See formulae below.
Occupancy
Occupancy – SMG Definition “The occupancy rate measures how full the space is compared to its capacity”
In this case, we are specifically looking at how well a room is used – whilst it is in use and this time there are three pieces of information you will need in order to calculate the occupancy rate;
The capacity of the room can be defined in a couple of ways, however the typical method is to use the “actual capacity” this being, how many people can actually use the space at one time. Using the previous example of a teaching room, the actual capacity would be how many people can comfortable sit in the room with allocated desk space given the furniture provision and layout. So, lets say when you check this teaching room it has 40 seats and 40 desks, therefore your actual space capacity is 40.
 Space capacity
 Total number of persons occupying space
 Number of hours space was in use
The capacity of the room can be defined in a couple of ways, however the typical method is to use the “actual capacity” this being, how many people can actually use the space at one time. Using the previous example of a teaching room, the actual capacity would be how many people can comfortable sit in the room with allocated desk space given the furniture provision and layout. So, lets say when you check this teaching room it has 40 seats and 40 desks, therefore your actual space capacity is 40.
Next step, is to find out 2) how many people are occupying the space whilst it is in use. As with the frequency rate, this requires checking the room over a set amount of time and in order to calculate the utilisation rate of this room (next step) you must ensure that both the frequency and occupancy rate are collected at the same time, for the same number of hours.
Continuing with this example, as you check the room every hour during the 45 hour teaching week you will also need to record how many people are in the room when it is being used. Then once you have completed all 45 hours, add up how many people are occupying the space whilst it is in use to get your 2) Total number of persons occupying space and then divide this by the 1) Space capacity multiplied by the 3) Number of hours space was in use (you know this from your frequency calculations) and you have your occupancy rate – see room check sheet and formulae below.
Continuing with this example, as you check the room every hour during the 45 hour teaching week you will also need to record how many people are in the room when it is being used. Then once you have completed all 45 hours, add up how many people are occupying the space whilst it is in use to get your 2) Total number of persons occupying space and then divide this by the 1) Space capacity multiplied by the 3) Number of hours space was in use (you know this from your frequency calculations) and you have your occupancy rate – see room check sheet and formulae below.
You now know, that on average when the room was used it was 74.17% occupied and therefore on average 26.83% of the capacity wasn’t used when the room was in use.
Utilisation
Utilisation – SMG Definition “The utilisation rate is a function of a frequency rate and an occupancy rate”
The finally part, is calculating your utilisation rate and this is the really simple bit, providing you have already got your frequency and occupancy rate for the space in question. So, continuing with our teaching room example, to calculate the utilisation rate all you have to do is multiply your frequency rate (66.67%) by your occupancy rate (74.17%) and you get your space utilisation rate (49.45%). See formulae below.
By following these steps you should now be able to calculate any given rooms frequency, occupancy and utilisation rate. This information can be used in many many ways, to help you improve many aspects of your institution such as reduce you estates costs, improve your student experience, as well as increase staff and students numbers without having build new spaces.
So, what do you think? Have you found this article useful? Is there anything you would like to add? Do you have any questions? Let us know via the comments box at the bottom of this article, it would be great to here from you and we'd be very interested to discuss this topic further with you.
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