What is aspect ratio?

Aspect ratio is the proportional relationship between width and height. Common ratios include 16:9 (widescreen), 4:3 (standard), and 1:1 (square).

Why is aspect ratio important for web design?

Maintaining correct aspect ratios prevents image distortion and ensures responsive layouts look correct across different screen sizes and devices.

Yes, enter any width and height to see the simplified ratio, decimal ratio, and scale dimensions proportionally by locking either width or height.

Calculate and convert aspect ratios for images, videos, and screens. Lock width or height to scale proportionally.

Common Ratios

Width

Height

When changing one side:

16:9

Simplified Ratio

1.7778

Decimal Ratio

1920×1080

Dimensions

Visual Preview

1920×1080

Calculate and convert aspect ratios for images, videos, and screens. Lock width or height to scale proportionally.

1Enter the width and height of your original image or video.
2The tool instantly calculates and displays the aspect ratio (e.g., 16:9, 4:3).
3Enter a new width or height to find the corresponding dimension that preserves the ratio.
4Use the common presets (1080p, 4K, Instagram, etc.) to jump to standard sizes.