01
Prepare the display
Clean the screen, use the device's native resolution, and let brightness stabilize before running Screen Size Calculator.
ToolsFree browser-based screen test
Screen Size Calculator
Calculate physical width, height, area, aspect ratio, and pixel density from diagonal size and resolution.
CalculatorsTest workspace
Use every mode and inspect the entire panel, including corners and edges.
Test workspace
2560 × 1440
Width23.53 in
Height13.24 in
Display area311.5 in²
Pixel density108.8 ppi
Aspect ratio16:9
How to use this test
A repeatable process gives more useful results than a quick glance.
02
Scan methodically
Run every available mode. Move your eyes across the center, edges, and corners instead of staring at one point.
03
Confirm the result
Repeat suspicious patterns at two brightness levels and compare with another display when possible.
What the result can tell you
Screen Size Calculator
The calculated values connect resolution, physical dimensions, density, and aspect ratio. Use manufacturer specifications when exact hardware dimensions matter.
Testing notes
Disable night-light, color filters, and automatic brightness while comparing colors or tones.
Use a dim room for dark patterns and normal ambient light for color and brightness checks.
Stop flashing or high-contrast motion tests immediately if they cause discomfort.
Frequently asked questions
Can this test prove that my screen is defective?+
It can reveal visible symptoms and help you reproduce them, but warranty decisions should be based on the manufacturer's policy and, when needed, instrument measurements.
Are any test results uploaded?+
No. Patterns, calculations, touch trails, and browser measurements run locally in this tab.
Why does the result change with brightness or viewing angle?+
Panel technology, local dimming, tone mapping, viewing angle, ambient light, and automatic display controls can all change what you see.