Step 1 place your measuring tape at the bulkhead of your truck bed.
How to measure your truck bed for a topper.
Record this measurement and label that number width.
Again the tape measure should be in a straight taut line even with the top of the bed.
Measure your truck bed length.
Hold one end of your tape measure against the inside of your truck bed s left front corner and have someone pull the tape measure until it reaches the inside of the front right corner.
Step 2 moving along your bed rail extend the measuring tape to the inside edge of the top of your tailgate.
So if your truck bed measures 76 you can go with the product listed for a 6 5 foot bed.
That s because most truck and accessory companies round off their measurements to the nearest half foot.