How to Measure for a Magnetic Screen Door

A magnetic screen door can only work well if it fits the opening. A screen that is too narrow leaves side gaps. A screen that is too short leaves bottom gaps. A screen that is much too large may bunch, drag, or close unevenly. Measuring correctly before you buy is the simplest way to avoid those problems.

The key is this: measure the door opening and the mounting surface, not just the moving door panel. Magnetic screens attach around the frame, so the full frame area matters.

Step 1: Measure the Usable Width

Use a tape measure across the full opening where people walk through. Measure from the left mounting edge to the right mounting edge. If your frame has trim, decide where the adhesive or track will sit, then measure that exact area.

Do not measure only the glass panel or one side of a French door. For double doors, sliding doors, and patio doors, measure the full open space that the screen needs to cover.

Step 2: Measure the Usable Height

Measure from the top mounting area down to the threshold or floor. If there is a raised sill, note that too. The screen should hang close enough to reduce insect gaps but not so low that it drags heavily every time the magnets close.

A small amount of bottom contact can help with sealing, but too much drag can make the screen harder for pets, kids, or guests to use.

Step 3: Understand Product Size vs Door Fit

Many magnetic screens are slightly larger than the listed door size. That extra material creates overlap around the frame. For example, the Fillis 36 x 80 Privacy PET Magnetic Screen Door is designed for doors up to 36 x 80 inches, while the product panel is larger for full coverage.

The Fillis 72 x 80 Side-Opening Magnetic Screen Door is designed for wide doorways, French doors, double doors, and large patio openings up to 72 x 80 inches.

Step 4: Check the Mounting Surface

Adhesive needs a flat, clean surface. If your frame is uneven, textured, dusty, or painted with weak old paint, the installation may need extra care. Renters should consider painter’s tape as a removable base layer before applying hook-and-loop tape.

If the opening is metal, pay attention to magnet side-sticking. You may need extra spacing or a non-magnetic barrier.

Step 5: Match the Door Type

Standard entry doors often work with 36 x 80 styles. Wide patio and French doors may need 72 x 80. Wide single entries can be a good match for a track-style option like the Fillis Retractable Screen Door 48 x 80.

If your door handle and traffic flow sit on one side, a side-opening screen may feel better than a center-opening design.

Common Measuring Mistakes

The biggest mistakes are measuring the door slab instead of the opening, forgetting trim, ignoring the threshold, and assuming all 36 x 80 doors have the same frame space. Take width and height twice before choosing a size.

For wide openings, compare this guide with our Sliding Door Sizing Guide.

FAQ

Should the screen be bigger than the door opening? Usually yes. A little overlap helps cover the frame and reduce gaps.

What if my opening is between sizes? Choose the option that covers the full opening without excessive bunching.

Do I measure from inside or outside? Measure the side where you plan to install the screen.