Aspect Ratio Finder – Find the Ratio From Dimensions, Images & Videos
Enter your width and height, or upload an image or video, to instantly find the simplified aspect ratio.
Enter a width and height to find the ratio instantly.
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Aspect Ratio Finder — Determine Your Ratio From Numbers or a File
Use this aspect ratio finder to determine aspect ratio from a width and height, or find the aspect ratio of an uploaded image or video. Enter your dimensions or upload a file to instantly get the simplified ratio, decimal value, and other useful details—no manual math or guesswork.
Find Aspect Ratio From Width and Height
Enter any width and height and this aspect ratio checker instantly simplifies them into the correct ratio, showing both the simplified form (such as 16:9 or 4:3) and its decimal equivalent. It's an easy way to calculate aspect ratio from width and height, calculate image aspect ratio, or quickly get the aspect ratio dimensions without using the formula yourself. If you don't have the dimensions, simply upload an image or video and let the tool detect them automatically.
Find the Aspect Ratio of an Image
Upload a photo, picture, or other image file and the tool automatically reads its pixel dimensions to determine the correct aspect ratio. It's a fast way to find the aspect ratio of an image, calculate image ratio, or get image ratio without opening file properties or image editors. Whether you're preparing content for social media, print, or the web, you can quickly check an image's aspect ratio before editing or sharing.
Works for Video Too
The same process works for videos. Upload a supported video file and this video ratio calculator automatically detects its resolution, frame size, and aspect ratio, making it easy to find aspect ratio or get aspect ratio directly from the file without entering dimensions manually.
What Your Results Include
Every result includes the simplified aspect ratio, decimal value, image orientation, megapixel count, and the nearest standard aspect ratio if your dimensions don't match one exactly. You can also preview the result alongside your uploaded image or video, making it a practical aspect ratio visualizer for comparing your media with common formats.
Need to Go the Other Direction?
If you already know your aspect ratio and need matching dimensions instead, use the Aspect Ratio Calculator. Enter the ratio and one dimension to instantly calculate the other in pixels or inches, making it easy to generate dimensions for images, videos, displays, and print.
Frequently asked questions
Common questions about the Aspect Ratio Finder.
What is aspect ratio?
Aspect ratio is the proportional relationship between an image, screen, or video's width and its height, written as width:height (for example, 16:9). It describes shape, not size — two files can share the same ratio even if one is far larger than the other.
Can I find the aspect ratio from an uploaded image?
Yes. Upload an image and this tool reads its width and height automatically before simplifying them into the correct aspect ratio, so you can instantly get the aspect ratio of your file. The same works for supported video files, making it easy to check the aspect ratio of an image before sharing it.
How do you calculate aspect ratio?
Divide the width and height by their greatest common divisor until neither can be simplified further. Enter your width and height above and this tool does that calculation instantly, returning the simplified ratio.
What is the formula for aspect ratio?
The formula is width : height, simplified by dividing both numbers by their greatest common divisor. For 1920×1080, the greatest common divisor is 120, so 1920÷120 = 16 and 1080÷120 = 9 — an aspect ratio of 16:9.
How do I find my aspect ratio?
Enter your width and height above, or upload the image or video directly and this tool will detect the dimensions and calculate the ratio for you. If you instead already know the ratio and need the matching pixel dimensions, use the Aspect Ratio Calculator.
Is 1920×1080 an aspect ratio or a resolution?
1920×1080 is a resolution — a specific pixel size. Its aspect ratio, the simplified shape, is 16:9. Many different resolutions (1920×1080, 1280×720, 2560×1440) share that same 16:9 ratio.
What aspect ratio is 1920×1080?
1920×1080 simplifies to 16:9, the standard widescreen ratio used by Full HD video, monitors, and most streaming content.
Is 1280×720 a 16:9 aspect ratio?
Yes. 1280×720 (HD, or 720p) simplifies to 16:9, the same ratio as 1920×1080 — just a lower pixel resolution at the same shape.
Is 1024×768 a 16:9 aspect ratio?
No. 1024×768 simplifies to 4:3, the older near-square format used by classic TVs and monitors — not the 16:9 widescreen ratio.
Is 1920×1080 a 4:3 ratio?
No. 1920×1080 simplifies to 16:9. A 4:3 image at a comparable pixel count would look closer to 1024×768 — noticeably taller and narrower than 16:9.
What aspect ratio is 1080×1350?
1080×1350 simplifies to 4:5, the portrait ratio commonly recommended for Instagram feed posts to maximize vertical space in the mobile feed.
What's a 9:16 aspect ratio?
9:16 is a tall, vertical ratio — the mirror image of 16:9 rotated on its side. It's the format built for full-screen mobile viewing, commonly used for Stories, Shorts, and Reels-style vertical video.
What is the difference between 4:3 and 16:9 aspect ratio?
4:3 is the older, nearly square format used by classic TVs and early digital photos. 16:9 is the modern widescreen standard used by almost all current video, streaming, and monitors. A 4:3 image looks noticeably taller and narrower side-by-side with the same content in 16:9.
What does a 2.39:1 aspect ratio mean?
2.39:1 (sometimes shown as 2.40:1) is an ultra-widescreen cinematic ratio, often called CinemaScope, used for theatrical film releases. It's significantly wider than standard 16:9 video, which is why movies formatted this way show black letterbox bars on a regular widescreen TV.