Aspect Ratio Calculator
Calculate ratios and resize dimensions instantly.
Why Aspect Ratio Matters
Whether you're a designer, video editor, or developer, understanding aspect ratios is crucial. Incorrect ratios lead to stretched images, black bars (letterboxing), or cropped content.
Common Ratios Explained
- 16:9 (Widescreen): The standard for HDTV, YouTube, and most modern monitors.
- 4:3 (Standard): Used in older TVs, iPads, and some photography formats.
- 1:1 (Square): Popularized by Instagram and social media profile pictures.
- 9:16 (Vertical): The standard for mobile stories (TikTok, Instagram Reels, YouTube Shorts).
- 21:9 (Ultrawide): Used in cinematic films and ultrawide gaming monitors.
How to Use This Tool
- Find Ratio: Enter width and height to see the simplified aspect ratio (e.g., 1920x1080 = 16:9).
- Resize Image: Enter your original dimensions. Then, type a new width OR height. The tool will calculate the missing dimension to keep the image perfectly proportioned.
Features
- Instant Calculation: Results update as you type.
- Visual Preview: See the shape of your ratio in real-time.
- Two-Way Resizing: Calculate width from height or height from width.
Frequently Asked Questions (FAQ)
What is aspect ratio?
Aspect ratio is the proportional relationship between the width and height of an image or screen. It is usually expressed as two numbers separated by a colon, like 16:9.
How do I calculate aspect ratio?
To find the aspect ratio, divide the width by the height. Then, simplify the fraction. For example, 1920 / 1080 simplifies to 16 / 9.
What are common aspect ratios?
16:9 is standard for HD video and monitors. 4:3 was used for old TVs and some tablets. 1:1 is a square (Instagram). 21:9 is for ultrawide monitors.
How do I use this to resize images?
Use the 'Resize Calculator' section. Enter your original dimensions, then enter ONE new dimension (width or height). The tool will automatically calculate the other to maintain the ratio.
Is this tool free?
Yes, the Aspect Ratio Calculator is completely free to use.