Aspect Ratio & Resolution Calculator
Calculate pixel dimensions, aspect ratio proportions, and letterbox/pillarbox padding for videos, responsive web layouts, and social media platforms.
Pixel Dimensions
Aspect Ratio Mathematics in Modern Media
An aspect ratio describes the proportional relationship between the width and height of an image or screen. Expressed as two numbers separated by a colon (e.g. 16:9), it remains constant regardless of the physical size or total pixel count of the display.
16:9 High Definition Standard
The universal standard for YouTube, television broadcasts, computer monitors, and laptops (1080p, 1440p QHD, 4K UHD).
9:16 Vertical Video Standard
Inverted 16:9 vertical format standard for mobile video consumption across TikTok, Instagram Reels, and YouTube Shorts (1080×1920).
Greatest Common Divisor (GCD)
Calculates the exact Euclidean GCD to reduce arbitrary screen resolutions (e.g. 2560×1600 = 16:10) to their simplest integer ratio fractions in browser memory.
Proportional Dimension Math
When scaling locked aspect ratios, the calculated height scales as: Height = round((Width × RatioHeight) / RatioWidth). All greatest common divisor reductions and decimal ratios evaluate in client-side JavaScript memory with zero network requests.
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