How to Measure for a Privacy Screen? | Get The Exact Fit

Measure your screen’s viewable area, not its outer frame, to find the right privacy filter.

Getting the right fit for a privacy screen starts with one observation: does your monitor, laptop, or MacBook have a raised bezel around the display, or does the glass run edge-to-edge with no frame? The answer changes how you measure. 3M’s official measuring guide makes this the very first step, and for good reason — the most common mistake people make is measuring the bezel or casing instead of the actual display area.

Identify Your Screen Type First

Before you pick up a ruler, look at the front of your display. A raised bezel screen has a visible plastic or metal frame that sits higher than the glass. A flat front glass screen is exactly what it sounds like: the glass covers the entire front surface with no raised border.

• Raised bezel display: measure only the visible screen area inside the bezel. Exclude the frame entirely.
• Flat front glass display: measure the entire glass surface from edge to edge, including any flat frame area that is part of the glass.

The Measuring Steps For Each Display Type

Once you’ve identified your screen type, grab a ruler or a tape measure — a flexible one gives better precision on curved edges.

3M’s method is straightforward: for raised bezel screens, measure the width and height of the visible screen area inside the bezel. For flat front glass screens, measure the full glass edge-to-edge. Kensington’s guidance adds a useful detail: measure accurately, exclude the bezel, and note its size while you’re taking the width and height.

Fellowes PrivaScreen takes a slightly different approach. Their guide says you need all three dimensions — diagonal, width, and height of the active portion — to choose the correct filter size. Relying on the diagonal alone can leave you with a filter that’s the right nominal size but the wrong shape for your specific display.

Common Mistakes That Ruin The Fit

The biggest error is including the bezel in your measurement. Official guidance from 3M and Kensington repeats this warning because it’s the most frequent cause of returns. A second mistake is assuming two screens with the same diagonal size will take the same filter. Laptop bezels vary wildly between brands, and even two models from the same manufacturer can have different viewable areas.

For Apple devices, the process is often simpler. 3M’s video guidance notes that for MacBooks and iMacs, there’s sometimes no measuring required at all — you identify the device model and whether the display is Retina or non-Retina, then choose from model-specific options. Apple’s product tables are strict about this, so check your exact model number rather than guessing.

That’s a helpful target, but it’s not a universal industry standard — the safe approach is simply to measure as precisely as you can and double-check your numbers.

Matching Your Measurement To A Filter

With your width, height, and diagonal recorded, you’re ready to shop. Select a filter that matches your exact dimensions and, where relevant, your device model. This is where the effort pays off — a correctly measured filter installs cleanly and blocks side-angle views without gaps or overhang.

If you’re shopping for a larger setup, our roundup of the best 8ft privacy screens covers tested options that use these same fitting principles at a much bigger scale.