To find the right bin bag for your square and rectangular bins you must add up each of its sides and divide by two.

Measure the circumference of your bin. The circumference is the length of the edge around a circle – in this case the length all the way around the rim.Then divide the circumference by two. The resulting number is the open width dimension you need for your bin bag.

The face width is the sealed, closed width of the bottom of your bin bag. The open width is the maximum width of the bin bag when it is stretched from one side to the other. The length is simply the measurement from the top to the very bottom of the bin bag. TIP: A simple way to calculate the circumference of your bin is to find the diameter (the width from one side to the other) and multiply this by 3.14 (pi). TIP: All of our bin bags state the face width, open width and length – saving you time and effort on measuring.TIP: A simple way to calculate the circumference of your bin is to find the diameter (the width from one side to the other) and multiply this by 3.14 (pi). Bin Liners Measure the height of your bin from top to bottom. Add approximately 20% onto the height to find the length of bin bag you need. This extra 20% allows for an overhang which stops the bag falling in the bin and gives you plenty of room for tying. Divide the perimeter of your bin by two. The resulting number is the open width you need for your bin bag.