Aspect Ratio Calculator – Resize, Convert & Calculate PPI Online
Our Aspect Ratio Calculator helps you instantly calculate, simplify, and resize image or video dimensions while maintaining the correct proportional ratio. Whether you're working with images, videos, web design, or screen resolutions, this tool ensures accurate results in seconds.
You can simplify aspect ratios (such as 1920×1080 to 16:9), resize images proportionally, convert fractions to ratios, and even calculate pixel density (PPI) for screens and displays.
What is an Aspect Ratio?
An aspect ratio represents the proportional relationship between the width and height of an image or screen. It is written in the format Width : Height, such as:
- 16:9 – Standard widescreen (HD & Full HD video)
- 4:3 – Traditional TV format
- 1:1 – Square images (Instagram posts)
- 21:9 – Ultrawide monitors
- 9:16 – Vertical mobile videos
Maintaining the correct aspect ratio prevents images or videos from appearing stretched, squashed, or distorted.
Features of This Aspect Ratio Calculator
- Simplify any width and height to the smallest ratio
- Quick preset buttons (16:9, 4:3, 1:1, 21:9, 3:2, 9:16)
- Common video resolution presets (HD, Full HD, 2K, 4K)
- Resize images while maintaining original proportions
- Convert fractions (e.g., 1920/1080) into simplified ratios
- Calculate Pixel Density (PPI) using screen diagonal size
- Instant automatic calculations with no reload required
How to Use the Calculator
Using this tool is simple:
- Enter the original width and height in pixels.
- View the simplified aspect ratio automatically.
- Enter a target width to resize proportionally.
- Use preset buttons for quick standard ratios or video resolutions.
- Enter screen diagonal size to calculate PPI.
Pixel Density (PPI) Explained
Pixel density, measured in PPI (Pixels Per Inch), indicates how sharp a display appears. A higher PPI means clearer and more detailed images. This tool calculates PPI using screen resolution and diagonal size, helping you evaluate display quality accurately.
Who Should Use This Tool?
- Graphic Designers
- Video Editors
- Web Developers
- Photographers
- UI/UX Designers
- Students and educators
Why Use Our Online Aspect Ratio Calculator?
Unlike manual calculations, this calculator eliminates errors and saves time. It works instantly in your browser, requires no downloads, and provides precise results for resizing, ratio simplification, and pixel density analysis.
Whether you're preparing images for social media, editing videos, designing websites, or comparing screen resolutions, this tool makes aspect ratio calculations fast, accurate, and effortless.