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Aspect Ratio Calculator

Enter any screen, image, or video resolution to instantly find its exact aspect ratio.

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Aspect Ratio

0:0

Decimal Ratio

0.00:1

What is an Aspect Ratio?

An Aspect Ratio is the proportional relationship between the width and height of an image, video, or physical screen. It is typically written as two numbers separated by a colon, such as 16:9.

Understanding your aspect ratio is crucial when buying a new PC monitor, resizing an image for social media, or rendering a video to ensure it doesn't get stretched, squished, or ruined by massive black bars.

Common Screen Aspect Ratios:

  1. 16:9 (Standard Widescreen): The global standard for HD TVs, YouTube videos, and standard PC monitors. Resolutions include 1920x1080 (FHD), 2560x1440 (QHD), and 3840x2160 (4K UHD).
  2. 21:9 (Ultrawide): Popular for immersive PC gaming and productivity setups. Common resolutions include 2560x1080 and 3440x1440.
  3. 16:10 (Productivity): Often found on modern laptops (like MacBooks) to give slightly more vertical space for reading documents. Resolutions include 1920x1200 or 2560x1600.
  4. 4:3 (Retro/Classic): The shape of old CRT televisions and retro PC monitors. (e.g., 800x600 or 1024x768).

Frequently Asked Questions (FAQ)

How do you calculate an aspect ratio?

To find the aspect ratio, you divide the width and the height by their Greatest Common Divisor (GCD). For example, the GCD of 1920 and 1080 is 120. When you divide 1920 by 120, you get 16. When you divide 1080 by 120, you get 9. Therefore, the ratio is 16:9. Our calculator does this complex math for you instantly.

What is a Decimal Ratio?

A decimal ratio is found by simply dividing the width by the height (e.g., 1920 ÷ 1080 = 1.778). This is often used in the film industry to describe aspect ratios. For example, a 16:9 screen is often referred to as a 1.77:1 display.

Why do I have black bars on my movies?

Most modern cinematic movies are filmed in an ultrawide format, specifically a decimal ratio of 2.35:1 or 2.39:1. Because a standard TV or monitor is 16:9 (1.77:1), the screen is not wide enough to fit the movie. To prevent the image from being squished, video players add black bars to the top and bottom of the screen (letterboxing).