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Aspect Ratio Calculator

Find the simplified aspect ratio of any pixel dimensions or calculate the missing width/height needed to scale videos and images proportionally. Includes one-click presets for 16:9 (YouTube/HD), 9:16 (Shorts/Reels/TikTok), 4:5, 4:3, and 1:1.

#design#aspect ratio#video#image#resolution

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How to Use Aspect Ratio Calculator

1Pick a common preset (such as 16:9 Landscape, 9:16 Vertical, or 4:5 Portrait) or enter a custom Width and Height.
2Lock the ratio and enter your new target Width (or Height) to calculate the exact matching dimension.
3Check the visual frame preview to see the proportions of your chosen aspect ratio.
4Copy the calculated pixel dimensions or CSS aspect-ratio rule.

Frequently Asked Questions

What are the standard pixel dimensions for 16:9 video?

Common 16:9 resolutions are 1280×720 (720p HD), 1920×1080 (1080p Full HD), 2560×1440 (1440p QHD), and 3840×2160 (4K UHD).

What aspect ratio should I use for YouTube Shorts, TikTok, and Instagram Reels?

Vertical short-form videos use a 9:16 aspect ratio, most commonly exported at 1080×1920 pixels.

How is the simplified aspect ratio calculated from width and height?

The calculator finds the Greatest Common Divisor (GCD) of the width and height using Euclid's algorithm and divides both numbers by that GCD (for example, 1920 and 1080 both divide by 120 to give 16:9).

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