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Video Aspect Ratio Calculator

Input a width or height to instantly find the exact matching pixel dimension for any popular video format.

Preview Box

16:9

Understanding Video Aspect Ratios

An aspect ratio is simply the proportional relationship between a video's width and its height. Getting this wrong before you render a video in Premiere Pro or DaVinci Resolve is a nightmare, as it leads to ugly black bars (letterboxing) or stretched faces.

The Standard 16:9 Landscape

This is the default aspect ratio for YouTube, cinematic screens, and standard monitors. If you want HD quality, your pixels need to match this ratio.

  • 720p: 1280 x 720
  • 1080p (Full HD): 1920 x 1080
  • 1440p (2K): 2560 x 1440
  • 2160p (4K): 3840 x 2160

The Rise of 9:16 Vertical Video

TikTok, YouTube Shorts, and Instagram Reels have made the 9:16 aspect ratio completely dominant for mobile consumption. If you are repurposing a standard 1080p YouTube video for Shorts, you must crop the center of the frame and render it at 1080 x 1920 pixels.

Creating YouTube Shorts?

If you are working in a 9:16 ratio for Shorts, you need to be extremely careful where you place text and graphics. The right side and bottom of a YouTube Short are covered by UI buttons (Like, Subscribe, Description). Use our Shorts Safe Zone Viewer to make sure your text isn't being covered.

About the Video Aspect Ratio Calculator

Instantly calculate perfect video dimensions for 16:9, 9:16 Shorts, 4:3, or 1:1. Never stretch or distort your videos again. This free video aspect ratio calculator runs entirely in your browser — nothing is uploaded, stored, or sent to a server, and there is no account to create. It is built for bloggers, content creators, and SEOs who want a fast answer without installing anything.

How to use it

  1. 1. Open the Video Aspect Ratio Calculator above.
  2. 2. Enter or paste your details into the fields provided.
  3. 3. Read your result instantly — adjust the inputs to compare scenarios.

Frequently asked questions

Is the Video Aspect Ratio Calculator really free?
Yes. Every tool on AiTooly is 100% free with no sign-up, no credit card, and no usage limit.
Do you store the data I enter?
No. This tool runs in your browser. Your input is never uploaded or saved on our servers.
Can I use it on mobile?
Yes, the Video Aspect Ratio Calculator works on any modern phone, tablet, or desktop browser.

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Looking for something else? Browse all free AI tools for bloggers or read the AiTooly blog.