Hub Aspect Ratio Calculator
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Aspect Ratio Calculator

Find the ratio from any dimensions, or calculate a missing dimension from a known ratio. Visual preview included.

Common Ratios
Width & Height → Ratio
Width (px)
×
Height (px)
16:9 Standard widescreen
16:9
Known Ratio → Missing Dimension
Ratio W
:
Ratio H
Width (px)
→
Height (px)

Fill in any one of the width or height fields to compute the other.

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How to use
  1. Pick a preset ratio or enter a custom one (e.g. 16:9 or 21:9).
  2. Type a known width or height — the matching dimension fills in automatically.
  3. Compare the live visual preview to confirm the shape before exporting.
FAQ

An aspect ratio is the proportional relationship between an image or video's width and height, written as W:H (for example 16:9). It describes the shape regardless of the actual pixel size.

16:9 is the modern widescreen standard used for HDTV, YouTube, and most modern displays. 4:3 is the older standard used by classic TVs and computer monitors before the 2000s — it's nearly square.

Pick your target ratio (e.g. 16:9), enter either the new width or new height, and let the calculator compute the matching dimension. This preserves the ratio without distortion.