An aspect ratio describes a width in relation to a height. Enter pixel dimensions to reduce that relationship, compare familiar shapes or calculate a missing dimension from a target ratio.
The reduced ratio is calculated from the numbers you enter. A common label such as ultrawide is a useful description, but it does not replace that exact arithmetic. Two resolutions can share an aspect ratio while containing very different numbers of pixels.
Choose which side is known and enter the desired relationship. The other side is rounded to a whole pixel where needed, so inspect the result before using it in an image, video or layout specification. The calculator does not decide which resolutions your hardware supports.
The visual comparison shows proportions rather than a physical screen measurement. Letterboxing, cropping and application layouts also depend on the content and chosen scaling mode. Use the ratio as one input to a design decision, alongside the actual target dimensions and viewing context.
3440×1440 reduces exactly to 43:18, which differs from the marketing label 21:9.
Enter image width and height in pixels.
Read the reduced ratio and total pixel count.
Choose common ratios to compare landscape and portrait shapes.
Patterns support visual inspection. Quantitative color accuracy, brightness, gamut coverage and response time require appropriate instruments and methods.
No. It provides display test patterns and browser information. Screen anomalies that persist at the same position need visual inspection and, when needed, professional assessment.
Open the patterns and guides for your device. True full screen and touch depend on the browser; an immersive page preview remains available when full screen is unsupported.
No installation is needed. Patterns, calculations and interactions run locally in your browser; theme preferences stay on your device.
Rule out dust, reflections and display settings. Repeat under the same conditions, photograph defects that remain in the same screen position and check the device warranty policy.