Aspect Ratio Calculator

Compute simplified aspect ratio fractions (e.g., `1920x1080` -> `16:9`, `1080x1080` -> `1:1`) from width and height dimensions, or calculate missing dimensions (width or height) when scaling media.

Why Use This Tool?

• Video & Photo Editing: Crop and scale video resolutions to standard aspect ratios (16:9, 4:3, 1:1, 9:16).
• Responsive Web Layouts: Calculate CSS canvas aspect ratio dimensions for video embed containers.
• Social Media Posts: Scale graphics for Instagram (1:1 square, 9:16 vertical story) without distortion.

How to Use

1. Enter Original Width and Height (e.g. `3840 x 2160`).
2. View simplified ratio (e.g. `16:9`).
3. Enter a new target width to solve the proportional new height automatically.

Real Working Example

Input:

Width: 1920 px | Height: 1080 px | New Target Width: 1280 px

Output Result:

Simplified Ratio: 16:9 | Calculated Proportional Height: 720 px (1280x720)

Important Technical Details & Formulas

• Greatest Common Divisor (GCD) Algorithm: Uses Euclidean GCD algorithm to simplify dimension ratios.
• Standard Ratio Presets: Presets for 16:9 (HD), 4:3 (SD), 1:1 (Square), 21:9 (Ultrawide), and 9:16 (Story).
• Local Memory Execution: Zero network overhead.

Related Measurement & Time Tools

• Image Resizer: Resize image dimensions.
• DPI / PPI Calculator: Calculate screen pixel density.
• CSS Units Converter: Convert PX to REM.