Aspect Ratio Calculator
Calculate dimensions and maintain perfect proportions for web, video, and social media.
Dimensions
grid_view Quick Presets
Visual Preview16:9
1920 × 1080
16:9
Quick Guide to Ratios
What is 16:9 used for?
16:9 is the standard aspect ratio for high-definition video and most computer monitors. It's the primary format for YouTube, Netflix, and modern television broadcasts.
Social Media Ratios
Instagram Posts typically use 1:1 (Square) or 4:5 (Portrait). Instagram Stories, TikTok, and Reels use 9:16 (Vertical) to fill a smartphone screen completely.
Cinema & Wide Formats
21:9 is known as Ultrawide, popular for immersive gaming and cinematic movies. 1.85:1 and 2.39:1 are standard widescreen formats used in movie theaters.
Why do Ratios matter?
Maintaining a consistent aspect ratio prevents "letterboxing" (black bars on top/bottom) or "pillarboxing" (black bars on sides) and ensures your visual content isn't stretched or distorted.
Frequently Asked Questions
What is an aspect ratio?
It's the proportional relationship between width and height, written as W:H. For example 16:9 is the standard for YouTube videos and most modern screens, while 1:1 is the square format used on Instagram.
What are the most common aspect ratios?
16:9 for video and screens, 4:3 for older displays and photography, 1:1 for social media squares, 9:16 for vertical video (Stories, Reels, TikTok), and 3:2 for DSLR photos.
What does the link/lock button do?
When locked, changing one dimension automatically updates the other to preserve the current ratio. When unlocked, width and height are independent, and the ratio is recalculated from whatever you type.
Is my data processed on a server?
No. All calculations happen instantly in your browser with JavaScript — nothing is transmitted anywhere.