Aspect Ratio Calculator
Calculate aspect ratios or find missing dimensions while maintaining perfect proportions. Essential for video production, image editing, web design, and choosing the right display size. Supports all common ratios including 16:9, 4:3, 21:9, and custom ratios.
What is aspect ratio and why does it matter?
Aspect ratio is the proportional relationship between width and height of an image, screen, or video, expressed as two numbers separated by a colon (e.g., 16:9). It matters because maintaining aspect ratio prevents distortion when resizing images or videos. Common uses: choosing the right TV or monitor size, cropping photos for social media, video editing, and graphic design. Different platforms prefer different ratios - YouTube uses 16:9, Instagram stories use 9:16 (vertical), and traditional photos use 4:3 or 3:2.
What is the difference between 16:9 and 4:3 aspect ratios?
16:9 (1.78:1) is widescreen - wider and shorter, used in modern TVs, monitors, and HD video (1920×1080, 3840×2160). 4:3 (1.33:1) is standard - more square-shaped, used in old TVs, some tablets, and vintage content. Example: A 40-inch 16:9 screen is 34.9" wide × 19.6" tall, while a 40-inch 4:3 screen is 32" wide × 24" tall. 16:9 provides more peripheral vision and is better for movies; 4:3 shows more vertical content, better for documents.
How do I calculate the missing dimension for a specific aspect ratio?
To find missing dimensions: If you know width and aspect ratio (e.g., 16:9), divide width by ratio width, then multiply by ratio height. Example: 1920 pixels wide in 16:9 = (1920 ÷ 16) × 9 = 120 × 9 = 1080 pixels height. If you know height: (Height ÷ ratio height) × ratio width. This maintains proportions perfectly. Use our calculator to avoid manual math and ensure accurate scaling for images, videos, or displays.
What aspect ratio should I use for social media?
Social media aspect ratios (2024): Instagram Feed: 1:1 (square) or 4:5 (portrait); Stories/Reels: 9:16 (vertical); Facebook: 16:9 or 1:1; YouTube: 16:9 (1920×1080); TikTok: 9:16 (1080×1920); Twitter: 16:9 or 1:1; LinkedIn: 1.91:1 or 1:1. Using correct ratios prevents cropping and ensures your content displays properly. Vertical video (9:16) is best for mobile viewing, while horizontal (16:9) suits desktop and landscape content.