Aspect Ratio Calculator – Perfect Dimensions for Social Media, Video & Print
Calculate 16:9, 9:16, 4:5, 1:1, and custom image ratios. Upload an image to detect dimensions or calculate proportional width and height instantly.
Looking for India-specific guidance? Visit the India version.
Stop guessing and start calculating the perfect aspect ratio for your images and videos. Whether you are a content creator, graphic designer, or web developer, getting the right 16:9, 9:16, 4:5, or 1:1 ratio is essential to prevent cropping and ensure your content looks professional. Platforms like YouTube, Instagram, and TikTok use specific ratios. Using the wrong one can destroy your engagement. Our calculator simplifies this process. Just enter your width and height (or target resolution), and we will instantly give you the exact simplified ratio.
For video editors, this ensures your 1920x1080 videos render correctly. For social media managers, it guarantees your 1080x1350 Instagram posts won't be awkwardly cut off. No sign-up, no uploads, fully private. Let's fix your dimensions instantly.
About Aspect Ratio Calculator – Perfect Dimensions for Social Media, Video & Print
WeLuvTools Aspect Ratio Calculator helps you calculate exact pixel dimensions for images, videos, thumbnails, social posts, website graphics, and print layouts. It can inspect an uploaded image and report its real width, height, simplified ratio, decimal ratio, orientation, and megapixel resolution. It also calculates a proportional missing width or height from any target size, so you can resize media without stretching. Images are read locally in your browser and never sent to a server.
100% Private
Files stay on your device.
Super Fast
Results in just a few seconds.
Secure & Safe
No account or upload needed.
Practical Limits
Capacity depends on your device.
Quick guide
How to use
Step 1
Choose Upload Image and select a JPG, PNG, WebP, GIF, or AVIF file.
Step 2
View the detected pixel dimensions, simplified ratio, orientation, and megapixels.
Step 3
Enter a target width or height to calculate the proportional missing dimension.
Step 4
Use Find Ratio when you already know an image's width and height.
Step 5
Use Calculate Size or a preset ratio when planning dimensions before creating an image.
Aspect ratio cheat sheet for social media and video
Use these as practical production canvases before resizing or cropping. Platform previews can change by placement, so keep important text and faces away from the edges.
| Platform or use | Best ratio | Common dimensions |
|---|---|---|
| YouTube (Horizontal) | 16:9 | 1920 x 1080 |
| YouTube Shorts / TikTok / Reels | 9:16 | 1080 x 1920 |
| Instagram Feed (Portrait) | 4:5 | 1080 x 1350 |
| Instagram Feed (Square) | 1:1 | 1080 x 1080 |
| Facebook / LinkedIn Posts | 4:5 or 16:9 | 1080 x 1350 / 1200 x 675 |
| Twitter / X | 16:9 | 1200 x 675 |
Practical scenarios
Use cases
Common ways people get more value from this tool.
Use case 1
Checking whether an uploaded thumbnail is truly 16:9 before publishing it on YouTube.
Use case 2
Finding the exact ratio of a camera photo before ordering a print or frame.
Use case 3
Calculating responsive website image dimensions without stretching the original.
Use case 4
Identifying whether a graphic is landscape, portrait, or square before a social media upload.
Use case 5
Scaling product photos to a smaller width while preserving their original proportions.
Use case 6
Reading screenshot dimensions and megapixels without opening desktop editing software.
Types & formats
Upload Image
Automatically detect dimensions, simplified ratio, orientation, decimal ratio, and megapixels
16:9 Widescreen
YouTube, HD and 4K video, most modern monitors, TV displays, and landscape thumbnails
9:16 Vertical
Instagram Reels, TikTok, YouTube Shorts, Stories, and mobile-first video
4:5 Portrait
Portrait feed graphics, social media cards, product images, and mobile-friendly ads
1:1 Square
Instagram posts, profile pictures, app icons, album covers, and product grids
Custom ratio
Enter any width-to-height ratio for exact planning before resizing or cropping
Recommended next step
Resize image after calculating
Once you know the exact width and height, use the Image Resizer to create a correctly sized JPG, PNG, or WebP.
Open toolCrop to a fixed ratio
If your image shape does not match the destination, crop to 1:1, 4:5, 16:9, or 9:16 without stretching.
Open toolRead the complete ratio guide
Learn how ratios, resolution, social media sizes, and proportional scaling work before publishing.
Open toolCompress after resizing
For upload forms with a small file-size limit, resize first and then compress the final image to 50KB or less.
Open toolThe WeLuvTools difference
Why choose WeLuvTools
Benefit 1
Upload an image and detect its ratio automatically instead of entering dimensions manually.
Benefit 2
Private local analysis means the selected image never leaves your browser.
Benefit 3
Instant calculation: enter one value and get the other immediately.
Benefit 4
Preset buttons cover common social media, video, website, and print workflows.
Benefit 5
Works both ways: calculate from a ratio or from existing dimensions.
Benefit 6
Free to use without creating an account; practical capacity depends on your browser and device.
Frequently Asked Questions
Related Tools
Image Resizer
Resize images to custom dimensions.
Image Cropper
Crop images to a specific area or aspect ratio.
Photo Compressor
Compress JPG, PNG, and WebP photos with a live quality preview.
All-in-One Image Tool
Convert, resize, compress and edit images - all in one place.
Compress Image to 50KB
Compress JPG, PNG, and WebP images to 50KB or less.