Aspect Ratio Calculator
Calculate & convert aspect ratios
How to Use Aspect Ratio Calculator
- 1
Enter the width and height of your image or video.
- 2
The tool calculates the aspect ratio and simplifies it (for example, 1920x1080 becomes 16:9).
- 3
Use the scaling calculator to find dimensions that maintain the ratio at a different size.
About Aspect Ratio Calculator
Calculate image and video aspect ratios. Find common sizes at any ratio. Lock width or height while resizing. Free online tool.
Best Use Cases
- •Find the correct ratio for video exports
- •Resize images while preserving proportions
- •Determine resolution for social media uploads
- •Convert between standard display aspect ratios
- •Lock dimensions when cropping photos
Examples
Video export
Enter 1920x1080 to confirm the ratio is 16:9 for YouTube uploads.
Social media sizing
Find the right pixel dimensions for a 4:5 Instagram portrait post.
Proportional resize
Lock width at 800px and calculate the matching height for a 3:2 ratio.
Common Mistakes to Avoid
- !Swapping width and height values
- !Confusing aspect ratio with resolution
- !Using pixel dimensions instead of ratio numbers
Limitations
- –Does not resize actual image files
- –Only covers standard rectangular ratios
- –Cannot detect ratio from uploaded images
Frequently Asked Questions
What is 16:9 aspect ratio?
16:9 is the standard widescreen format used for HD video and monitors. Common sizes: 1280×720, 1920×1080, 3840×2160 (4K).