📖 Official User Guide
Aspect Ratio Calculator — Calculate Image & Video Dimensions While Maintaining Proportions — Step-by-Step Guide
Master proportional scaling and ensure your images and videos look perfect across all screens and platforms.
What is Aspect Ratio?
Aspect ratio is the proportional relationship between the width and height of an image or video screen. It is expressed as two numbers separated by a colon, like **16:9** (Widescreen) or **1:1** (Square).
Popular Ratios
- 16:9: Standard for YouTube, TV, and monitors.
- 9:16: Perfect for Reels, TikToks, and Phone Stories.
- 1:1: Classic Instagram square posts.
- 4:5: Instagram portraitposts for maximum feed space.
How to Use the Calculator
- Enter Original Values: Type in your starting width and height (e.g., 1920 and 1080).
- Set New Dimension: Type a new width, and the calculator finds the height (or vice versa) instantly.
- Use Presets: Click any of our 12 presets to load industry-standard dimensions like 4K or Instagram Square.
- Visual Box: Watch the blue preview box update in real-time to see the shape of your new dimensions.
Frequently Asked Questions
Why is it important to maintain aspect ratio?
Scaling an image without maintaining its ratio leads to stretching or squashing, making your content look unprofessional and distorted.
What is 4K resolution aspect ratio?
True 4K (3840×2160) is exactly 16:9. Our calculator allows you to find proportional resolutions for any display.