Screen Size & Wall Fit Calculator
Calculate screen width, height and diagonal—or find the largest TV or projector screen that fits your wall.
Your measurements and results stay in this browser tab. They are not uploaded or automatically included in feedback.
Enter your measurements to see screen dimensions and a visual fit.
How it works
- Choose a known diagonal, available wall dimensions, or a known width or height.
- Choose the aspect ratio and units. For feet + inches, enter either or both parts.
- For Wall Fit, adjust equal clearance per side. Compare the common size with the practical and absolute maxima.
- Review the diagram, copy the results, and check the actual product’s outside dimensions before buying or mounting.
A real example
Fictional planning example: a 140 × 90-inch opening with 2 inches of clearance per side has 136 × 86 inches of usable space. At 16:9, width limits the practical diagonal to about 156 inches. The largest size in our reference list that fits is 150 inches, with a screen area about 130.7 × 73.5 inches.
That leaves about 9.3 inches horizontally and 16.5 inches vertically in the full opening, or approximately 4.6 and 8.2 inches per side when centered.
Diagonal size is not width
A screen’s diagonal runs corner to corner across its image area. At 16:9, a 100-inch screen is about 87.2 × 49 inches; 120 inches is about 104.6 × 58.8 inches; and 150 inches is about 130.7 × 73.5 inches. A different aspect ratio changes both dimensions at the same diagonal.
The engine uses the Pythagorean relationship and the chosen width:height ratio. It keeps full precision for calculations and rounds results only for display. Known Width or Height mode derives the other dimension and diagonal from that ratio.
Measure the opening and allow clearance
Measure the narrowest usable width and height, accounting for shelving, trim and other obstructions. Use the same units for the opening and clearance. The default 2-inch allowance is per side: it removes 4 inches from usable width and 4 inches from usable height, never from the diagonal.
Absolute maximum uses the entire opening without clearance. Practical maximum uses the reduced opening. “Limited by” identifies the dimension that prevents a larger screen; an exact proportional fit can be limited by both. Remaining space is measured against the full opening, not the reduced area.
TVs, projector screens and reference sizes
These dimensions describe the image rectangle. A TV’s bezel, stand, connectors and ventilation requirements, or a projector screen’s frame and housing, add space. Check the manufacturer’s complete dimensions and installation instructions. The illustration is explanatory, not a mounting or architectural drawing.
Our reference diagonals are 32, 40, 43, 48, 50, 55, 65, 70, 75, 77, 80, 83, 85, 86, 98, 100, 110, 120, 125, 130, 135, 140, 150, 160, 180 and 200 inches. Not every size exists for every product or aspect ratio. The largest fitting reference size is a geometry result, not a product or viewing-distance recommendation. Mathematical maxima remain visible even beyond the list.
Frequently asked questions
Can I use this for a TV or projector screen?
Yes, for the physical image rectangle. Add the actual product’s frame, housing, stand and required ventilation allowances separately. It does not calculate projector throw distance or recommend viewing distance.
What if no common size fits?
The tool shows the true practical maximum and its dimensions without inventing a reference size below 32 inches. Above 200 inches it identifies the largest size in our list while keeping the larger mathematical maximum visible.
Can I use a custom aspect ratio?
Yes. Select Custom and enter positive width and height ratio values. The same geometry applies to very wide or tall ratios, provided the result can be represented as a finite number.
Does changing units change the result?
Measurements convert through inches without rounding intermediate geometry. Inches, feet + inches, centimeters and meters represent the same physical dimensions. Results usually display one decimal place, so small differences in displayed rounding are normal.
Why does clearance produce an error?
Clearance must be zero or positive and leave usable width and height. If twice the per-side clearance consumes either dimension, no practical fit is calculated.
Are my measurements uploaded or saved?
No. Calculation and diagrams run locally in your browser tab. Refreshing clears entries. Copy Results uses your clipboard; if unavailable, a text area lets you copy manually. Feedback does not automatically include measurements or results.
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