Aspect Ratio Calculator
Calculate aspect ratios and resize images, videos, and screens while keeping their proportions.
Enter Dimensions
Calculate the height using the current aspect ratio.
Aspect Ratio Result
Visual Preview
1920 × 1080 px
Common Aspect Ratio Presets
Select a preset to load example dimensions. You can edit them afterward.
Aspect Ratio Calculator – Calculate Image and Video Dimensions
An Aspect Ratio Calculator helps you calculate the relationship between the width and height of an image, video, display, or screen. It makes it easy to find the correct dimensions. Whether you are editing images, creating videos, designing websites, or preparing social media posts, this tool helps you calculate aspect ratios quickly and accurately.
What Is an Aspect Ratio?
An aspect ratio represents the proportional relationship between the width and height of an image or screen. It is usually written as two numbers separated by a colon, such as 16:9, 4:3, or 1:1.
For example, an image with a width of 1920 pixels and a height of 1080 pixels has an aspect ratio of 16:9. This ratio is commonly used for videos, YouTube content, and widescreen displays.
How to Use the Aspect Ratio Calculator
Using our free online aspect ratio calculator is simple:
- Enter the width and height of your image, video, or screen.
- Select your preferred measurement unit, such as pixels, inches, centimeters, or millimeters.
- View the simplified aspect ratio and visual preview automatically.
- Enter a new width or height to calculate the corresponding dimension while preserving the ratio.
- Choose a common aspect ratio preset or copy your result for later use.
The calculator updates the result automatically whenever you change the original dimensions.
Common Aspect Ratios
Here are some popular aspect ratios and their typical uses:
- 16:9: YouTube videos, widescreen monitors, and online video content.
- 9:16: Vertical videos, Instagram Reels, and YouTube Shorts.
- 1:1: Square images and social media posts.
- 4:3: Traditional television screens, presentations, and older displays.
- 3:2: Digital photography and printed photographs.
- 21:9: Ultrawide monitors and cinematic content.
- 4:5: Portrait-oriented social media posts.
Frequently Asked Questions
1. How do I calculate an aspect ratio?
Divide the width and height by their greatest common divisor to get the simplified ratio. For example, 1920 × 1080 simplifies to 16:9.
2. What is the most common aspect ratio for videos?
The 16:9 aspect ratio is widely used for YouTube videos, computer displays, and widescreen video content.
3. What is the difference between 16:9 and 9:16?
A 16:9 ratio is wider than it is tall and is suitable for landscape videos. A 9:16 ratio is taller than it is wide and is commonly used for vertical videos and mobile content.
4. Can I calculate a missing width or height?
Yes. Enter the original dimensions, then provide a new width or height in the corresponding calculator field. The tool calculates the other dimension using the existing aspect ratio.
5. Does changing the aspect ratio reduce image quality?
Changing the ratio alone does not necessarily reduce quality. However, cropping, resizing, or stretching an image can affect its appearance or resolution.
6. Is this aspect ratio calculator free?
Yes. You can use the calculator for free in your browser without installing additional software.
7. Can I use this calculator for screen dimensions?
Yes. You can calculate aspect ratios for computer monitors, laptops, televisions, mobile screens, and other displays by entering their width and height.