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Video Aspect Ratio Calculator

Enter any width and height to get the simplified aspect ratio, decimal ratio, orientation and the social platforms that match.

Presets

9:16

1080 × 1920 px · Portrait · 2.07 MP

9:16
Simplified ratio
9:16
Decimal ratio
0.5625
Orientation
Portrait

Recommended social formats

  • TikTok / Reels / Shorts (9:16)

How it works

  1. 1Type a width and height in pixels, or tap a preset.
  2. 2The simplified ratio, decimal ratio and orientation update instantly.
  3. 3The preview box shows the real shape of the frame.
  4. 4Matching social formats are listed underneath.

Features

  • Presets for 16:9, 9:16, 1:1, 4:5, 4:3 and 3:2.
  • Exact greatest-common-divisor simplification.
  • Orientation and megapixel count.
  • Automatic matching against TikTok, Reels, Shorts, Pinterest, X and LinkedIn.
  • Copy-ready summary, fully client-side.

Examples

  • 1920 × 1080 → 16:9, landscape
  • 1080 × 1920 → 9:16, portrait
  • 1080 × 1350 → 4:5, portrait
  • 1080 × 1080 → 1:1, square
  • 3840 × 2160 → 16:9 (4K UHD)

What an aspect ratio tells you

An aspect ratio describes shape, not size. 1280 × 720 and 1920 × 1080 are both 16:9. Matching the platform's ratio prevents cropping; matching its recommended resolution prevents upscaling. Get the ratio wrong and the platform decides what to cut — usually the middle of your subject.

Choosing a ratio per platform

  • 9:16 — TikTok, Reels, Stories, Shorts.
  • 4:5 — Instagram portrait feed posts.
  • 1:1 — square posts.
  • 16:9 — YouTube, LinkedIn, X.
  • 2:3 — Pinterest pins.

Tips

  • Shoot slightly wider than your final ratio for reframing room.
  • Never stretch to fit — crop instead.
  • Check the export size with the Video File Size Calculator.

Frequently Asked Questions

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