How to use this calculator
- 1. Choose a mode based on what you already know: diagonal, viewing distance, or resolution.
- 2. Pick the aspect ratio, and use the custom fields only when the preset does not match your screen.
- 3. In diagonal mode, add a resolution if you also want PPI and pixel pitch.
- 4. In distance mode, pick a viewing-angle preset as a planning baseline and compare alternatives later if needed.
- 5. Copy the URL when you want to reopen or share the same setup.
Use this page for practical screen sizing, viewing-distance planning, and pixel-density checks. It does not cover projector throw, curved-panel geometry, or eyesight claims.
Use this when you know the advertised diagonal and want the real visible screen width and height.
Use this when you know how far away you will sit and want a recommended screen size.
Use this when you want pixel density and pixel pitch from a display size and resolution.
Results
Enter screen details to see the result.
Physical size
Recommended viewing distances
Pixel density
What this calculator is for
- Checking the real visible width and height behind an advertised diagonal size.
- Estimating viewing distance from simple horizontal-angle presets.
- Comparing PPI and pixel pitch across TV and monitor sizes.
What this calculator does not do
- No bezel-inclusive cabinet dimensions or product-database lookup.
- No projector throw distance or curved-screen arc geometry.
- No retina-distance, eyesight, medical, or ergonomic guarantees.
How the estimate is calculated
- Width and height come from the diagonal and aspect ratio using basic right-triangle geometry.
- Viewing distance uses the visible screen width and the selected horizontal viewing angle.
- Recommended size from distance reverses the same angle formula to recover width, height, and diagonal.
- PPI uses the pixel-diagonal divided by the physical diagonal in inches.
- Pixels per cm and pixel pitch are derived directly from PPI assuming square pixels.
The viewing-angle presets are planning defaults for comparison. They are not medical or ergonomic guarantees.
PPI assumes square pixels. Curved-panel geometry and projector throw are outside the v1 scope.
FAQ
Does screen size mean the cabinet size or just the panel?
This page assumes the advertised size means the visible panel diagonal. The outer cabinet can be larger because of bezels, frame shape, or stand design.
Why are there multiple viewing-distance numbers?
Because the page shows simple planning presets for different use cases. A TV watched casually can use a narrower angle, while a desk monitor often feels better with a wider angle.
Can I use this for curved screens?
Only as a flat-screen approximation. The v1 scope does not model curved-panel arc length, radius, or wraparound geometry.
Why is there no PPI result when I only enter a diagonal?
Because PPI depends on both the physical diagonal and the pixel resolution. Add a resolution preset or custom resolution to calculate it.
Is this a medical or ergonomic recommendation?
No. The angle presets are practical comparison defaults only. They are not medical advice, eyesight diagnostics, or a guarantee of comfort.
Next steps
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Switch between display-width and viewing-distance units without leaving the browser.
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Comments
Share viewing-distance rules of thumb, monitor-planning notes, or practical sizing tips that help others compare setups.