1. What is Image Aspect Ratio?

The aspect ratio of an image describes the proportional relationship between its width and height. It's expressed as two numbers separated by a colon (e.g., 16:9) or as a single decimal number (e.g., 1.777).

2. How Aspect Ratio is Calculated

The aspect ratio is calculated using the simple formula:

Where:

• Width — Horizontal dimension in pixels
• Height — Vertical dimension in pixels

Explanation: The ratio represents how many times the width is larger than the height. For example, a 1920×1080 image has a ratio of 1.777 (16:9).

3. Common Aspect Ratios

Details: Some standard aspect ratios include:

• 1:1 (Square)
• 4:3 (Traditional TV)
• 16:9 (HDTV, most videos)
• 3:2 (35mm film)
• 21:9 (Ultrawide cinema)

4. Using the Calculator

Tips: Enter the width and height in pixels (must be positive integers). The calculator will show both the decimal ratio and simplified ratio (e.g., 1.777 and 16:9).

5. Frequently Asked Questions (FAQ)

Q1: Why is aspect ratio important?
A: It determines how images fit on different displays and maintains proper proportions when resizing.

Q2: What's the difference between aspect ratio and resolution?
A: Resolution is the total pixel count (e.g., 1920×1080), while aspect ratio is the proportion between dimensions (16:9).

Q3: How do I maintain aspect ratio when resizing?
A: Multiply one dimension by the ratio to get the other (e.g., for 16:9, height = width × 9/16).

Q4: What's pixel aspect ratio?
A: Some video formats use non-square pixels, where the width:height of individual pixels isn't 1:1.

Q5: How do I calculate megapixels from aspect ratio?
A: Megapixels = (width × height) / 1,000,000. With ratio and one dimension, you can calculate the other.