Free Video Aspect Ratio Calculator (Online Tool)

Easily calculate the right aspect ratio for any video or image.

Find the Perfect Format – Instantly

Use our free video aspect ratio calculator to quickly determine or convert the shape of your video or image content. Whether you’re preparing content for YouTube, Instagram, or TikTok, or resizing a project in post-production, this tool gives you accurate aspect ratios in just a few clicks.

What Does This Tool Do?

This video aspect ratio calculator app lets you:

• Find the aspect ratio of a video by entering width and height
• Calculate pixel dimensions for a specific aspect ratio (e.g., 16:9, 4:5, 9:16)
• Convert between formats like widescreen, vertical, square, and cinematic
• Use presets or input custom values for flexible output

Perfect for creators, editors, marketers, and developers who need fast results without guesswork.

Who is This Video Ratio Calculator For?

• Video editors using Premiere Pro, Final Cut, or CapCut
• Social media marketers planning posts for Instagram Reels, Facebook, or LinkedIn
• Web developers and designers optimising visuals
• Anyone who needs a fast, no-fuss video aspect ratio calculator online

How To Use this Video Ratio Calculator

Of course. Here is a simple explanation of how to use the Aspect Ratio Calculator tool.

This tool has two main functions:

1. Calculate New Dimensions: Use this when you know your video’s aspect ratio and want to resize it while keeping the same shape.
2. Find Aspect Ratio from Dimensions: Use this when you have specific pixel dimensions and want to find out what the simplified aspect ratio is.

1. How to Calculate New Dimensions

This is perfect for when you need to change the size of a video without distorting it.

Option A: Using a Preset

1. Select a Preset: Click the dropdown menu under “Select a Common Aspect Ratio” and choose the one you need, like 16:9 (Widescreen - YouTube, TV).
2. Auto-fill: The “Width (W1)” and “Height (H1)” boxes will automatically fill with standard dimensions (e.g., 1920 and 1080).
3. Enter Your New Size: Now, type your desired new width into the “New Width (W2)” box. The “New Height (H2)” will calculate automatically. Alternatively, you can enter a new height, and the width will be calculated.

Option B: Using Your Own Dimensions

1. Enter Original Dimensions: If you have a custom-sized video, type its dimensions directly into the “Width (W1)” and “Height (H1)” boxes.
2. Enter Your New Size: Just like with the preset, type your desired new width or height into the “New Width (W2)” or “New Height (H2)” box, and the other value will be calculated for you instantly.

2. How to Find the Aspect Ratio from Dimensions

Use this part when you have a video file and you want to know its exact aspect ratio.

1. Enter Dimensions: In the section “Find Aspect Ratio from Dimensions,” type the pixel width and height of your video into the corresponding boxes.
2. See the Result: The simplified aspect ratio (like “16:9” or “4:3”) will immediately appear next to the “Aspect Ratio:” label.

Clear All Button

If you want to start over at any time, simply click the blue “Clear All” button at the bottom. This will reset every field in the calculator.

 Common Ratios Supported:

• 16:9 (Widescreen: YouTube, TV)
• 9:16 (Vertical video: TikTok, Reels)
• 1:1 (Square: Instagram Feed)
• 4:3 (Classic TV/Fullscreen)
• 4:5 (Portrait – Instagram Feed)
• 21:9 (Cinematic, Ultrawide)
• Custom aspect ratios

Video Aspect Ration Calculator FAQs

What is a video aspect ratio calculator and how does it work?

A video aspect ratio calculator helps you quickly determine the proportional relationship between a video’s width and height. You enter either both pixel values (width and height) or one with a target ratio, and the tool calculates the corresponding value to match a correct aspect ratio. It ensures your videos don’t appear distorted, cropped, or incorrectly scaled across platforms.

How do I find or calculate the aspect ratio of my video?

Divide the width by the height of your video. For example, a video that’s 1920px wide and 1080px tall equals 1920 ÷ 1080 = 1.78, which is commonly written as 16:9. You can also use a video aspect ratio calculator to do this automatically by entering your video’s resolution.

How do I use a video aspect ratio calculator step by step?

1. Enter your video’s width and height in pixels.
2. The tool will automatically calculate the aspect ratio (e.g., 16:9, 4:5, etc.).
3. If you only have one value (width or height), you can enter a target aspect ratio (e.g., 1.77 for 16:9), and the calculator will give you the matching dimension.
4. Adjust or export your video accordingly based on the results.

What are the standard aspect ratios for videos?

Common video aspect ratios include:

• 16:9 – Standard widescreen (YouTube, TV)
• 9:16 – Vertical (TikTok, Reels, Shorts)
• 1:1 – Square (Instagram, Facebook feeds)
• 4:3 – Traditional TV or vintage footage
• 4:5 – Portrait (social ads)
• 21:9 – Cinematic widescreen (films)

How can I convert my video’s pixel dimensions into an aspect ratio?

Simply divide the width by the height to get a decimal (e.g., 1920 ÷ 1080 = 1.78). This corresponds to standard ratios like 16:9. Or, use an online video ratio calculator to instantly translate pixel dimensions into common aspect ratios.

How do I change a video’s aspect ratio without distorting the image?

Use proper video editing tools to crop, reframe, or add letterboxing/pillarboxing. Avoid stretching your footage. A video aspect ratio calculator ensures you adjust only one dimension (width or height) while maintaining the original ratio to prevent distortion.

Can I use an aspect ratio calculator for both images and videos?

Yes. Aspect ratio calculators work for any visual content that uses pixel dimensions, including videos, images, presentations, thumbnails, or animations. Just enter the width and height to calculate or convert.

How do I calculate the correct width or height for a specific aspect ratio?

Use the formula:

• Height = Width ÷ Ratio
• Width = Height × Ratio Or let the calculator do it. For example, if you want a 16:9 aspect ratio and your width is 1920px, divide 1920 by 1.77 to get a height of 1080px.

What’s the difference between aspect ratio and resolution?

• Aspect Ratio describes the proportional shape of the video (e.g., 16:9 or 1:1).
• Resolution refers to the pixel detail, like 1920×1080 or 3840×2160. Two videos can share the same aspect ratio but have different resolutions.

Why is choosing the right aspect ratio important for social media or YouTube videos?

Using the correct aspect ratio ensures your video looks professional, fills the screen properly, avoids black bars, and performs better on each platform’s algorithm. For example, YouTube prefers 16:9, TikTok 9:16, and Instagram feed posts often work best in 4:5.

How do I resize a video and keep its original aspect ratio?

To resize without distortion:

• Keep the same aspect ratio while adjusting dimensions
• Use editing tools or an aspect ratio calculator to scale the width or height proportionally Avoid freehand resizing which can warp or stretch the content.

How do I crop a video to a specific aspect ratio?

Most video editors allow you to select a target aspect ratio (e.g., 9:16). The software then crops excess portions from the frame. Use safe zones to avoid losing key content, and check the preview before exporting.

Which aspect ratio should I use for different platforms?

• YouTube: 16:9
• YouTube Shorts: 9:16
• Instagram Feed: 4:5 or 1:1
• Instagram Stories/Reels: 9:16
• TikTok: 9:16
• Facebook Feed: 4:5 or 1:1
• LinkedIn: 4:5 for mobile, 16:9 for desktop A video aspect ratio calculator can help match content to each platform correctly.

How do I compare the aspect ratios of two different videos or screens?

Use a calculator or spreadsheet to compare each video’s width and height, then convert each to aspect ratios (e.g., 1280×720 = 16:9). You can then visually or numerically compare to ensure compatibility.

What happens if I use the wrong aspect ratio for my video?

Your video may appear:

• Cropped incorrectly
• Distorted or stretched
• Framed with black bars (letterboxing or pillarboxing) It can also reduce engagement, cause ad placement issues, and feel unprofessional.

Are there free online aspect ratio calculators available?

Yes, including the Blue Square Management Video Aspect Ratio Calculator. It’s fast, free, browser-based, and requires no download. Perfect for content creators, marketers, and video editors.