Aspect Ratio Calculator

What is an Aspect Ratio?

An aspect ratio is the proportional relationship between width and height, expressed as two numbers separated by a colon (e.g., 16:9). It describes the shape of an image, video, or screen.

How to Use the Aspect Ratio Calculator

Calculate Ratio from Dimensions

Enter width and height to find the aspect ratio. For example, 1920 × 1080 pixels equals 16:9. The calculator automatically simplifies to the smallest whole numbers.

Calculate Width or Height

Select a preset ratio (or enter a custom one), then input either width or height. The calculator will compute the missing dimension to maintain the exact aspect ratio.

Resize While Maintaining Ratio

Enter your current dimensions, then specify a new width or height. The calculator will automatically adjust the other dimension to keep the same aspect ratio.

Common Aspect Ratios

16:9 (Widescreen)

The most common aspect ratio for modern displays, HDTVs, YouTube videos, and computer monitors. Standard resolutions: 1920×1080 (Full HD), 3840×2160 (4K).

4:3 (Standard)

Traditional TV and computer monitor format. Common in older content and some photography. Standard resolutions: 1024×768, 1600×1200.

1:1 (Square)

Perfect square format. Popular for Instagram posts, profile pictures, and album covers. Common sizes: 1080×1080, 2048×2048.

9:16 (Vertical)

Vertical format for mobile content. Used for Instagram Stories, TikTok, YouTube Shorts, and smartphone screens. Essentially 16:9 rotated 90 degrees.

21:9 (Ultra-wide)

Ultra-wide format for cinematic content and gaming monitors. Offers an immersive viewing experience with wider field of view.

3:2 (Photography)

Common in digital photography, matching 35mm film proportions. Used by many DSLR and mirrorless cameras. Print size: 4×6 inches.

Use Cases

Video Production

• YouTube: 16:9 (1920×1080 or 3840×2160)
• Instagram Stories: 9:16 (1080×1920)
• TikTok: 9:16 (1080×1920)
• Cinema: 2.39:1 (4096×1716)

Print Media

• 4×6 Photo: 3:2 ratio
• 5×7 Photo: 7:5 ratio
• 8×10 Photo: 5:4 ratio
• Letter Paper: 1.29:1 (8.5×11)

Social Media

• Instagram Feed: 1:1 (1080×1080) or 4:5 (1080×1350)
• Facebook Post: 1.91:1 (1200×630)
• Twitter Post: 16:9 (1200×675)
• LinkedIn: 1.91:1 (1200×627)

Web Design

• Desktop: 16:9 or 16:10
• Mobile: 9:16 to 9:19.5 (various phones)
• Tablet: 4:3 (iPad) or 16:10 (Android)

Tips for Choosing Aspect Ratios

• Match your aspect ratio to your target platform for best results
• Use 16:9 for general-purpose video content and presentations
• Use 1:1 for social media posts that appear in feeds
• Use 9:16 for mobile-first content like Stories and short-form video
• Consider cropping margins when converting between aspect ratios
• Maintain aspect ratio when resizing to avoid distortion and stretching