Video Ratio Calculator
Whether you’re a video editor, content creator, filmmaker, or social media manager, getting the right video aspect ratio is crucial. The Video Ratio Calculator is a simple yet powerful tool that converts any video resolution into a standard aspect ratio like 16:9, 4:3, 21:9, and more.
This tool is perfect for anyone needing quick, accurate aspect ratio data—whether you’re resizing videos, editing for YouTube, or formatting media for mobile and cinema screens.
What Is the Video Ratio Calculator?
The Video Ratio Calculator is an online tool designed to help you convert pixel dimensions (width × height) into a simplified aspect ratio (like 16:9 or 4:3).
This tool calculates the greatest common divisor (GCD) of the input values to reduce the width and height to their simplest form, giving you the correct ratio for your video.
How to Use the Video Ratio Calculator
Using this calculator is quick and easy. Just follow these steps:
✅ Step 1: Enter Video Width (px)
Input the horizontal pixel count of your video.
Example: For a 1920×1080 video, enter 1920.
✅ Step 2: Enter Video Height (px)
Input the vertical pixel count of your video.
Example: For a 1080p video, enter 1080.
✅ Step 3: Click “Calculate”
Hit the “Calculate” button to instantly receive the aspect ratio.
Output: The tool simplifies the ratio — 1920 ÷ 120 = 16 and 1080 ÷ 120 = 9, so the result is 16:9.
✅ Step 4: View Your Results
The simplified Aspect Ratio will appear in the result box and is read-only, ready to be copied or referenced.
Example Calculations
| Width (px) | Height (px) | Aspect Ratio |
|---|---|---|
| 1920 | 1080 | 16:9 |
| 1280 | 720 | 16:9 |
| 1024 | 768 | 4:3 |
| 3840 | 2160 | 16:9 (4K UHD) |
| 2560 | 1440 | 16:9 (QHD) |
| 1080 | 1080 | 1:1 (Square) |
Why Use This Tool?
🎯 Accuracy
The calculator uses GCD math logic to reduce resolutions to their lowest terms for a precise ratio.
🧠 No Math Required
Avoid the headache of calculating ratios manually—this tool does it all in a second.
🎥 Professional Use Cases
Supports filmmakers, editors, and designers working across YouTube, TikTok, TV, mobile, and cinema formats.
📱 Versatile Formatting
Helpful for uploading to platforms like Instagram (1:1), YouTube Shorts (9:16), or widescreen content (21:9).
Common Video Aspect Ratios and Their Uses
| Aspect Ratio | Description | Common Use Cases |
|---|---|---|
| 16:9 | Widescreen | YouTube, TV, Web Videos |
| 4:3 | Standard Definition (SD) | Old TVs, Legacy Webcams |
| 21:9 | Cinematic Ultra-Wide | Film, Movie Trailers, Ultra-Wide Monitors |
| 1:1 | Square | Instagram Posts |
| 9:16 | Vertical Video | TikTok, Instagram Reels, YouTube Shorts |
| 18:9 (2:1) | Full Mobile Screens | Modern Smartphones |
20 FAQs About the Video Ratio Calculator
1. What is an aspect ratio?
It’s the proportional relationship between video width and height.
2. How does the tool calculate aspect ratio?
It divides both width and height by their greatest common divisor (GCD) to reduce the ratio to its simplest form.
3. Why is aspect ratio important?
It affects how your video is displayed on screens. Using the wrong ratio can result in letterboxing or cropping.
4. Does this tool support 4K or 8K resolutions?
Yes, you can input any pixel dimensions, including ultra-high-definition resolutions.
5. Can I use this for social media video formatting?
Absolutely! Get accurate ratios for YouTube, Instagram, TikTok, and Facebook video uploads.
6. What happens if I input 1080 × 1920?
The calculator will still return a simplified ratio, in this case 9:16 (vertical format).
7. Does it work with square videos?
Yes, entering equal width and height (e.g., 1080 × 1080) results in a 1:1 aspect ratio.
8. Is this tool mobile-friendly?
Yes, the tool is responsive and can be used on phones, tablets, or desktop devices.
9. Can I input fractional or decimal numbers?
No. The calculator only works with whole numbers (pixels), as resolution is measured in full pixels.
10. Is the calculator accurate?
Yes. It uses mathematical GCD reduction for precision.
11. Can I reverse the inputs (e.g., portrait)?
Yes. Enter height as width and vice versa to calculate ratios for portrait videos.
12. Is 16:9 the same as 1920×1080?
Yes. 1920×1080 is the most common 16:9 resolution, but many other resolutions also reduce to 16:9.
13. Does it support anamorphic ratios?
It can simplify any resolution, but for anamorphic values, consider how stretching affects display.
14. What about unusual ratios like 2.35:1?
You can input those resolutions (like 2350×1000) to get their simplified ratio.
15. Why is my ratio not a round number?
If the width and height don’t divide evenly, you may get unusual ratios like 37:20, which is mathematically correct.
16. Is this useful for thumbnails?
Yes! Use it to size thumbnails or graphics proportionally.
17. What do I do with the result?
Use the ratio to format your content in editing software, online platforms, or when resizing video.
18. Can I share or embed this tool?
If it’s hosted on your site, yes—share the link freely for other creators to benefit.
19. Can I use this calculator for photography?
Yes, aspect ratios apply to photos as well as video.
20. Is this tool free?
Yes, it’s completely free to use with no signup required.
Final Thoughts
With video content dominating the digital world, having the correct aspect ratio is more critical than ever. Whether you’re editing for cinematic widescreen or formatting for mobile vertical platforms, the Video Ratio Calculator is your go-to tool for getting it right.