Find Your Aspect Ratio (2026): Calculate Ratio From Width & Height
When you know an image’s width and height but don’t know the aspect ratio, guessing can lead to resizing errors and layout problems. This guide explains how to calculate an aspect ratio from dimensions, how to interpret the results, and how to use the ratio correctly for web, social media, video, and print.
Quick Reference: Popular Aspect Ratios
| Aspect Ratio | Common Name | Typical Use | Example Dimensions |
|---|---|---|---|
| 16:9 | Widescreen | Websites, YouTube, video | 1920×1080 |
| 4:3 | Standard | Photography, presentations | 1024×768 |
| 1:1 | Square | Social media posts | 1080×1080 |
| 9:16 | Vertical | Stories, mobile screens | 1080×1920 |
| 21:9 | Ultrawide | Cinematic displays | 2560×1080 |
How the Aspect Ratio Calculator Works
Calculator Input & Output
- Input: Any width and height
- Units: Pixels, inches, or centimeters
- Output: Simplified aspect ratio
- Extra Info: Decimal ratio and common name
The calculator divides the width by the height and simplifies the result to the smallest whole-number ratio. For example, 1920×1080 simplifies to 16:9.
How to Calculate Aspect Ratio Manually
Step 1: Divide Width by Height
Start by dividing the width by the height to get the decimal ratio.
Step 2: Simplify the Numbers
The calculator finds the greatest common divisor and reduces the numbers to their simplest form.
Step 3: Match to a Standard Ratio
Once simplified, the ratio can be matched to common standards like 16:9, 4:3, or 1:1.
Pro Tip: Multiple resolutions can share the same aspect ratio. For example, 1280×720, 1920×1080, and 3840×2160 are all 16:9.
Find Your Aspect Ratio Instantly
Enter any width and height to instantly calculate the correct aspect ratio.
Use Aspect Ratio Calculator →Common Use Cases
Preparing Images for Social Media
Different platforms use fixed ratios. Knowing the ratio lets you resize content correctly before uploading.
Designing Website Layouts
Consistent aspect ratios help maintain clean grids and balanced designs.
Video & Multimedia Projects
Matching aspect ratios prevents black bars, cropping, or distortion.
Resize With Confidence
Once you know the ratio, resizing without distortion becomes simple.
Try the Calculator →Conclusion
Finding an aspect ratio from width and height is essential for accurate resizing and consistent layouts. Enter your dimensions, confirm the simplified ratio, and use it to prepare images and videos for any platform.