Calculate and convert between different aspect ratios for screens, images, and videos
Dimensions will maintain aspect ratio
Results
16:9
1.778
1920 × 1080 = 2073600
16:9
Visual representation
The aspect ratio describes the proportional relationship between width and height. It's commonly expressed as W:H (e.g., 16:9).
16:9 - Standard for modern TVs, computer monitors, and online videos
4:3 - Traditional TV and early computer monitors
21:9 - Ultrawide cinematic format
1:1 - Square format popular on social media
Aspect Ratio Calculator: Find Your Screen Ratio
This Aspect Ratio Calculator helps you figure out the right proportional relationship between width and height for your screens, images, and videos. Whether you're resizing images, editing videos, or designing websites, maintaining the correct aspect ratio is essential for professional-looking results.
What is an Aspect Ratio?
Aspect ratio is the proportional relationship between the width and height of a rectangular display, image, or video. It's typically expressed as two numbers separated by a colon (e.g., 16:9), representing the width and height respectively. This ratio describes the shape of the content, not its actual size in pixels.
For example, a 16:9 aspect ratio means that for every 16 units of width, there are 9 units of height, regardless of whether those units are pixels, inches, or centimeters.
How to Use This Aspect Ratio Calculator
Select a common aspect ratio from the dropdown or choose "Custom" for your own dimensions
Toggle the "Lock Ratio" button to maintain proportions as you adjust dimensions
Enter the width of your content in the Width field
Enter the height of your content in the Height field (or let the calculator determine it if ratio is locked)
View your results including the simplified ratio, decimal ratio, and total pixels
The visual representation helps you see the shape of your aspect ratio at a glance.
Common Aspect Ratios and Their Uses
Aspect Ratio
Decimal
Common Uses
Example Resolutions
16:9
1.78:1
Modern TVs, monitors, smartphones, YouTube videos
1920×1080, 1280×720, 3840×2160
4:3
1.33:1
Traditional TVs, older monitors, iPads
1024×768, 800×600, 640×480
21:9
2.33:1
Ultrawide monitors, cinematic films
3440×1440, 2560×1080
1:1
1:1
Social media profile pictures, Instagram posts
1080×1080, 1200×1200
3:2
1.5:1
DSLR cameras, 35mm film, photo prints
6000×4000, 1500×1000
9:16
0.56:1
Mobile portrait videos, TikTok, Instagram Stories
1080×1920, 720×1280
Why Aspect Ratio Matters
Using the correct aspect ratio is crucial for several reasons:
Visual Integrity: Prevents images and videos from appearing stretched or distorted
Professional Appearance: Ensures content looks polished and properly formatted
Platform Compatibility: Helps content display correctly across different devices and platforms
Print Quality: Ensures photos print without unexpected cropping or white borders
Calculating Aspect Ratio
To calculate aspect ratio:
Find the Greatest Common Divisor (GCD) of the width and height
Divide both the width and height by their GCD
Express the result as width:height
For example, if your image is 1920×1080 pixels:
The GCD of 1920 and 1080 is 120
1920 ÷ 120 = 16
1080 ÷ 120 = 9
The aspect ratio is 16:9
Our calculator handles this math automatically, giving you the simplified ratio instantly.
Resizing While Maintaining Aspect Ratio
When resizing content, maintaining the aspect ratio is crucial. Here's how:
To resize based on width: Multiply the original height by the ratio of new width to original width
To resize based on height: Multiply the original width by the ratio of new height to original height
For example, to resize a 1920×1080 image to a width of 1280 pixels:
New height = 1080 × (1280 ÷ 1920) = 720 pixels
The new dimensions are 1280×720, maintaining the 16:9 aspect ratio
The "Lock Ratio" feature in our calculator automatically performs these calculations for you.
Aspect Ratio for Different Platforms
Different platforms and devices have preferred aspect ratios:
YouTube: 16:9 is the standard (videos with other ratios will have black bars)
Instagram: 1:1 for profile photos, 4:5 to 1.91:1 for timeline posts, 9:16 for Stories
TikTok: 9:16 vertical format
Twitter: 16:9 for videos, 2:1 for shared images
Facebook: 1.91:1 for timeline posts, 16:9 for videos
Film: 1.85:1 (standard widescreen) or 2.39:1 (anamorphic widescreen)
Print Photography: 3:2 or 4:3 depending on the format
Aspect Ratio Conversion Tips
When converting content between different aspect ratios, you have several options:
Cropping: Remove parts of the image to fit the new ratio (preserves scale but loses content)
Letterboxing/Pillarboxing: Add black bars to maintain the original ratio within the new frame
Stretching: Distort the image to fit the new ratio (generally not recommended)
Smart Scaling: Use content-aware scaling that preserves important elements
For professional results, cropping is usually preferable to stretching when aspect ratio changes are necessary.
Questions About Aspect Ratio
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