Determine what items are going into storage. Establish a square or rectangular space for items going into storage. Gather your items and place them into this designated area.
Measure the length and width in feet of your designated storage space. Multiply length and width to get the square footage.
Utilize a space calculator, such as the one on the Guardian Self Storage website, if you are unable to put your items in one area before renting storage. Enter your items to calculate square footage.
Check with your local storage unit providers to find out the cost and available storage space by square footage. If the storage provider doesn't have the exact size you need, you may want to choose a larger storage size to allow for adequate room.