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Aspect Ratio Calculator

Calculate, maintain and convert aspect ratios for images, videos and screens.

Find aspect ratio from dimensions

Scale dimensions keeping ratio

Common presets:

What is this tool?

An aspect ratio calculator is a free tool that calculates and scales image or video dimensions while maintaining the correct aspect ratio. Enter any width and height to find the ratio, or enter a ratio and one dimension to calculate the missing dimension — essential for responsive design, video production and print work.

How to Use

1
Enter your original dimensionsType the width and height of your original image, video or design element.
2
Enter the target dimensionEnter either the target width or target height — leave the other field empty.
3
Get the calculated dimensionThe missing dimension is calculated instantly, maintaining the exact original aspect ratio with no stretching or distortion.

Common Uses

🎬
Video Production

Calculate 16:9 dimensions for YouTube, 9:16 for TikTok/Reels, 1:1 for Instagram — all without distortion.

🖼️
Image Resizing

Scale images proportionally for different screen sizes, print sizes and social media platforms.

💻
Web Design

Calculate responsive image dimensions and maintain aspect ratios in CSS for flexible layouts.

🖨️
Print Design

Scale artwork from screen dimensions to print dimensions while maintaining correct proportions.

Frequently Asked Questions

What does aspect ratio mean?

Aspect ratio is the proportional relationship between an image's width and height, expressed as W:H. Common ratios: 16:9 (widescreen), 4:3 (standard), 1:1 (square), 9:16 (portrait/vertical).

What is the aspect ratio of a standard HD video?

Standard HD and Full HD video uses a 16:9 aspect ratio. Common resolutions: 1280×720 (720p), 1920×1080 (1080p), 3840×2160 (4K).

What is 4:3 aspect ratio?

4:3 is the traditional standard definition TV and early computer monitor ratio. For every 4 units of width there are 3 units of height. Common resolution: 1024×768.

What aspect ratio does Instagram use?

Instagram supports multiple ratios: 1:1 (square, 1080×1080), 4:5 (portrait, 1080×1350) and 16:9 (landscape, 1080×608).