Aspect Ratio Calculator
Calculate aspect ratios, resize images and videos while maintaining proportions. Perfect for video editing, graphic design, and screen resolution calculations.
GCD Algorithm
Automatically simplifies ratios to lowest terms using Euclidean algorithm.
Resize Calculator
Scale dimensions while maintaining perfect aspect ratio proportions.
Visual Preview
See a proportional representation of your aspect ratio instantly.
Video Production
Calculate aspect ratios for YouTube (16:9), Instagram Reels (9:16), or cinema (2.39:1). Ensure your videos display perfectly on all platforms.
Image Design
Resize images while maintaining proportions for social media posts, banners, and thumbnails. Perfect for designers and content creators.
Screen Resolution
Calculate aspect ratios for monitors, TVs, and mobile devices. Optimize display settings and understand screen proportions.
Photography
Work with standard photography ratios like 3:2 (DSLR) or 4:3 (medium format). Crop and resize photos while maintaining composition.
Frequently Asked Questions
What is an aspect ratio?
An aspect ratio is the proportional relationship between width and height of an image, video, or screen. It is typically expressed as two numbers separated by a colon (e.g., 16:9). This ratio describes the shape of the rectangle and is crucial for proper display across different devices and platforms.
How do I calculate aspect ratio from dimensions?
Enter your width and height values in the calculator, then click Calculate. The tool will automatically simplify the ratio to its lowest terms using the GCD (Greatest Common Divisor) algorithm. For example, 1920×1080 simplifies to 16:9.
What is the 16:9 aspect ratio used for?
16:9 is the standard aspect ratio for HD video content, including YouTube videos, HDTVs, and most modern computer monitors. Common resolutions include 1920×1080 (Full HD), 2560×1440 (QHD), and 3840×2160 (4K UHD).
How do I resize while maintaining aspect ratio?
Switch to Resize mode, enter your original dimensions, choose which dimension to lock (width or height), enter your target dimension, and click Calculate. The tool will automatically calculate the other dimension to maintain the aspect ratio perfectly.
What are common aspect ratios for social media?
Instagram square posts use 1:1 (1080×1080), Instagram Stories and Reels use 9:16 (1080×1920), YouTube videos use 16:9 (1920×1080), TikTok videos use 9:16 (1080×1920), and Facebook shared images often use 1.91:1 (1200×628). Each platform has optimal dimensions for best display quality.
What is the GCD algorithm?
GCD (Greatest Common Divisor) is the Euclidean algorithm used to find the largest number that divides both width and height evenly. This allows us to simplify aspect ratios to their lowest terms. For example, the GCD of 1920 and 1080 is 120, which simplifies the ratio to 16:9.