Aspect Ratio Calculator
Calculates proportional dimensions when scaling images or video while maintaining ratio
Width of the original image or frame
Height of the original image or frame
Enter new width to calculate proportional height
Enter new height to calculate proportional width
Simplified ratio of width to height
Proportionally scaled width
Proportionally scaled height
Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height. Common ratios include 16:9 (widescreen video), 4:3 (traditional TV), 1:1 (square, Instagram), and 3:2 (DSLR photos). Maintaining the ratio when resizing prevents images and video from appearing stretched or squished.
What aspect ratio should I use for social media?
Each platform has preferred ratios: Instagram feed 1:1 or 4:5, Instagram Stories/Reels 9:16, YouTube 16:9, TikTok 9:16, Facebook feed 1.91:1, Twitter/X 16:9, LinkedIn 1.91:1. Using the wrong ratio results in cropping or black bars.
How do I calculate aspect ratio from pixel dimensions?
Divide both width and height by their greatest common divisor (GCD). A 1920x1080 image: GCD is 120, so 1920/120 = 16 and 1080/120 = 9, giving a 16:9 ratio. For quick estimation, divide width by height to get the decimal ratio (1920/1080 = 1.78, which is 16:9).
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