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Aspect Ratio Calculator

Find the aspect ratio of any resolution, or compute the missing dimension when resizing — 16:9, 4:5, 3:2 and more.

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Find the ratio

Aspect Ratio—

Compute missing side (keep ratio)

New Height—

Aspect Ratios in Practice

The aspect ratio is width:height reduced to smallest terms — 1920×1080 is 16:9. When resizing, keep the ratio to avoid distortion: new height = new width × (h ÷ w). Common targets: 16:9 video and YouTube, 3:2 most cameras, 4:5 Instagram portrait, 1:1 square, 9:16 Stories/Reels/TikTok.

Frequently Asked Questions

What resolution is 4:5 for Instagram?

The recommended portrait size is 1080×1350. From any width, height = width × 1.25.

How do I convert 16:9 footage to 9:16?

You crop, not stretch: a 1920×1080 frame yields a 608×1080 vertical slice — which is why vertical versions should be framed at capture time.

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