Aspect
Ratio
Calculator

Calculate and simplify aspect ratios from pixel dimensions. Scale to new sizes while preserving proportions. Common presets for video, photo, and social media.

Original Dimensions

×
Aspect Ratio

16:9

Decimal: 1.7778

Scale to New Size

Enter a new width or height to calculate the other dimension while keeping the same ratio.

Preview

16:9

Common Ratios

Learn more

Why is 16:9 the standard, and what happens when your content and container ratios do not match?

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Frequently Asked Questions

1920x1080 has an aspect ratio of 16:9, which is the standard for HD and 4K video, most computer monitors, and YouTube videos.

Enter the original dimensions to find the aspect ratio, then use the "Scale to New Size" section to enter your desired width or height. The calculator will compute the matching dimension to preserve the exact proportions.

Instagram supports 1:1 (square posts), 4:5 (portrait posts, recommended for maximum feed visibility), 16:9 (landscape), and 9:16 (Stories and Reels). Use the presets in the calculator to quickly switch between these.