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Female Tools  ·  Aspect Ratio Calculator

Aspect Ratio Calculator

Calculate aspect ratios from dimensions, find missing sizes, and explore common presets.

Aspect ratio mixups are a common source of stretched thumbnails, cropped video exports, and mismatched design specs. This calculator handles it two ways: enter a width and height to get the simplified ratio (1920×1080 → 16:9), or enter a known ratio plus one dimension to solve for the other — useful when a video needs to be 16:9 and 1280px wide but you need the exact height. A visual preview box shows the shape at a glance, and a presets panel covers the ratios used most across video (16:9, 21:9), photography (3:2, 4:3), and social platforms (1:1, 9:16, 4:5). Built for video editors, photographers, designers, and developers who need an exact number fast, without opening design software.

Dimensions → Ratio

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Find Missing Dimension

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Common Presets

How to Use Aspect Ratio

  1. Enter a width and height to instantly calculate the simplified ratio.
  2. Or enter a known ratio (e.g. 16:9) plus one dimension to find the missing one.
  3. Check the visual preview box to see the shape at that ratio.
  4. Browse the presets panel for common video, photo, and screen ratios.

Frequently Asked Questions

Enter any two known values (width, height, or ratio) and the calculator fills in the missing dimension. E.g. width 1920 + ratio 16:9 → height 1080.

16:9 = HD video/monitors. 4:3 = older screens. 1:1 = Instagram square. 9:16 = TikTok/Stories vertical. 2:1 = cinematic ultrawide.