How to Measure for Custom Shelves (Simple Guide)
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A replacement shelf fits best when you measure the shelf board itself, including fractional inches. If you do not have a shelf to copy, measure the opening and check the supports and clearance before choosing your final size.
1. Measure length, left to right
Measure the existing shelf from its left edge to its right edge. If measuring an empty opening, check the width at the front, middle, and back at the height where the shelf will sit. Use the smallest opening measurement as your starting point, then check how the shelf must pass through the cabinet opening or door.
2. Allow for installation clearance
Do not assume a shelf cut to the exact opening width will slide into place. For a straight, unobstructed opening, a small allowance such as 1/16 to 1/8 inch may help, but the right amount depends on the cabinet, supports, and installation angle. For example, if the tightest opening is 36 inches, a proposed 35 7/8-inch shelf leaves 1/8 inch total clearance. Check that size in your own space before ordering.
3. Measure depth, front to back
Measure the board you are replacing, or determine where the new shelf should stop relative to the cabinet front, doors, and supports. Confirm that hinges, trim, rails, and the door swing do not interfere. Measure both sides if the space is not square.
4. Choose the visible edges
Our standard shelf is 3/4-inch melamine-faced particleboard. Select PVC edge banding for the exposed edges you want finished. On the SHELFIX order form, the front edge follows the shelf length. Check whether you also need short-side or all-edge banding.
5. Write down the finished board size
Enter the final board dimensions as length × depth, including fractions of an inch. Examples within our standard online size range include 35 7/8 inches long × 12 inches deep and 30 inches long × 14 inches deep. Our standard online range starts at 6 inches on each side, with a maximum depth of 24 inches and a maximum parcel length of 43 inches. For longer pieces or a larger trade project, request a project quote before ordering.
6. Review before checkout
Choose the finish and quantity, enter your final length and depth, and confirm the edge-banding selection. SHELFIX cuts the shelf board to the measurements you submit; cabinet structures, supports, brackets, and installation are not included. If your opening is unusual or you are unsure how to measure, contact us with a photo and measurements before placing the order.