Free

What Is a Video Aspect Ratio Calculator?

A video aspect ratio calculator helps you find the exact dimensions to resize or crop your video to any standard ratio, such as 16:9, 9:16, 1:1, or 4:5. Instead of doing manual math and guessing pixel values, you enter one dimension and instantly get the matching height or width. The best part? A free video aspect ratio calculator works right in your browser, with no signup and no upload.

For video editors, social media managers, and content creators, this is essential. Whether you are preparing a vertical clip for TikTok, a square post for Instagram, or a widescreen video for YouTube, a reliable video aspect ratio calculator ensures your footage is never cropped or stretched incorrectly. However, getting the ratio right matters more than most people realize — wrong dimensions can blur or letterbox your final render.

How to Use This Tool

Using this tool is straightforward. First, enter your known width or height in the input field. Next, select your target aspect ratio, such as 16:9 or 9:16. Then, the calculator instantly shows the matching dimension you need. In addition, you can use it to check whether an existing video already matches a ratio before you upload it. Because it runs locally, your numbers are never sent anywhere.

Why Use a Video Aspect Ratio Calculator?

There are several reasons to keep a video aspect ratio calculator bookmarked. For example, it saves time when preparing multi-platform content, prevents distorted uploads, and removes the guesswork from video editing. Therefore, it is a small tool with a big impact on production quality. Meanwhile, since it is free, you can check as many dimensions as you like without limits.

Video Aspect Ratio Calculator vs. Manual Math

You could calculate dimensions by hand, but a free tool is faster and error-free. The math behind aspect ratios follows a simple cross-multiplication rule, similar to the proportional scaling described on the Wikipedia Aspect Ratio page. For everyday editing — resizing clips, fitting thumbnails, planning storyboards — a video aspect ratio calculator gives you the answer in seconds with zero mistakes.

Video Aspect Ratio Calculator – Calculate & Resize Video Dimensions

Calculate the perfect aspect ratio for your video content. Enter your dimensions and instantly see all common video ratios, custom resolutions, and scaling recommendations. 100% free, no signup.

Video Aspect Ratio Calculator

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