Measure the frame. You will measure across the middle of the trampoline from outside frame to outside frame, straight across the middle. To get the most accurate measurement, you should measure in 2 spots as shown in the diagram to the left.
Measure the springs. You will take a spring OFF of the trampoline, make sure that it is fully recoiled and measure it from hook-end to hook-end. It is very important that you not use a stretched-out spring and that the spring NOT be attached to the trampoline to get an accurate measurement.
Count the springs. You will count the spring holes around the top of the trampoline frame. We suggest that you also count your springs to make sure that none are missing.
Measure the mat. If possible, it is best to measure the mat while still attached to the frame. You will measure the mat from hem to hem straight across the middle, DO NOT INCLUDE THE V-RINGS. Note the EXACT inches of the measurement.