Free Aspect Ratio Calculator - Get Exact Pixel Dimensions
⚙️ Converter ToolsCalculate 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.
What is Free Aspect Ratio Calculator - Get Exact Pixel Dimensions?
WeLuvTools Aspect Ratio Calculator helps you calculate exact pixel dimensions for images, videos, thumbnails, social posts, website graphics, and print layouts.
Wrong aspect ratios cause cropped images, stretched videos, blurry thumbnails, and social posts that look different after upload. This calculator helps you find the exact shape of any image or video before you resize, crop, or publish it.
Enter width and height, choose a preset ratio, or upload an image to detect its real pixel dimensions locally in your browser. You can calculate the missing width or height for common formats like 16:9 YouTube thumbnails, 9:16 Reels and Shorts, 4:5 portrait posts, 1:1 square graphics, and custom ratios.
About Free Aspect Ratio Calculator - Get Exact Pixel Dimensions
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.
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 video | 16:9 | 1920 x 1080 |
| YouTube thumbnail | 16:9 | 1280 x 720 or 1920 x 1080 |
| YouTube Shorts | 9:16 | 1080 x 1920 |
| Instagram feed square | 1:1 | 1080 x 1080 |
| Instagram feed portrait | 4:5 | 1080 x 1350 |
| Instagram Stories and Reels | 9:16 | 1080 x 1920 |
| TikTok video | 9:16 | 1080 x 1920 |
| Facebook or LinkedIn post | 4:5 or 1:1 | 1080 x 1350 or 1080 x 1080 |
| Website hero image | 16:9 or 21:9 | 1920 x 1080 or 2560 x 1080 |
| Product card image | 1:1 or 4:5 | 1200 x 1200 or 1200 x 1500 |
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
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