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Aspect Ratio and Proportional Size Calculator

Compute and lock an aspect ratio in your browser. Derive a ratio from width and height, or change one side while the other stays proportional. Includes common presets and a preview for cropping, video frames, and responsive layouts.

Quick switch→Angle Converter
RatioSizeDesign
Quick switch:Angle ConverterCSS Unit ConverterLocal Image Resizer

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Use cases

  • Keep banners or OG images on a fixed ratio
  • Match video or screen resolutions to a ratio
  • Resize one dimension while locking the other

How to use

  1. Enter original width and height, or pick a preset
  2. Change width or height while the ratio is locked
  3. Copy the result and review the preview

Example input and output

16:9 at width 1920

1920

Height

1080

FAQ

Are results rounded?

Yes. Pixel values are rounded so fractional pixels do not skew layout or export work.

Which presets are included?

Common sizes such as 1920×1080, 2K, 4K, vertical 9:16, square 1:1, YouTube 16:9, and OG Image.

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Local Image Resizer

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Angle Converter

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Convert degrees, radians, gradians, and turns in your browser with linked inputs—useful for CSS rotate(), Canvas, and Three.js work where Math.PI conversions are easy to get wrong. Results stay on the page.

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