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Aspect Ratio Calculator

Calculate aspect ratios from dimensions or find dimensions from a given ratio.

Common Ratios

Resolution Presets

ResolutionDimensionsRatio
720p (HD)1280 x 72016:9
1080p (Full HD)1920 x 108016:9
1440p (QHD)2560 x 144016:9
4K (UHD)3840 x 216016:9

Result

Simplified Ratio16:9
Decimal Ratio1.7778
Original Dimensions1920 x 1080

Ratio Preview

16:9

What is Aspect Ratio?

An aspect ratio describes the proportional relationship between the width and height of a display or image. For example, 16:9 means the width is about 1.78 times the height, and is the standard for most monitors and TVs. 4:3 is common in older monitors and iPads, while 1:1 (square) is popular for social media posts.

Calculation Examples

Ratio of 1920x1080: GCD(1920, 1080) = 120 → 1920/120 : 1080/120 = 16:9 Ratio of 2560x1440: GCD(2560, 1440) = 160 → 2560/160 : 1440/160 = 16:9 Height for 4:3 ratio with width 1024px: 1024 × (3/4) = 768px

What is Aspect Ratio?

An aspect ratio describes the proportional relationship between the width and height of a display or image. For example, 16:9 means the width is about 1.78 times the height, and is the standard for most monitors and TVs. 4:3 is common in older monitors and iPads, while 1:1 (square) is popular for social media posts.

Calculation Examples

Ratio of 1920x1080: GCD(1920, 1080) = 120 → 1920/120 : 1080/120 = 16:9 Ratio of 2560x1440: GCD(2560, 1440) = 160 → 2560/160 : 1440/160 = 16:9 Height for 4:3 ratio with width 1024px: 1024 × (3/4) = 768px

FAQ

What is the most common aspect ratio?
16:9 is the most common aspect ratio, used by most monitors, TVs, and smartphones. Other popular ratios include 4:3 (classic TV), 21:9 (ultrawide), and 1:1 (social media).
How do you calculate an aspect ratio?
Find the Greatest Common Divisor (GCD) of the width and height, then divide both by the GCD. For example: 1920x1080 → GCD is 120 → 16:9.
How do I find dimensions from a ratio?
If you know one dimension and the ratio, calculate the other. For example: 16:9 ratio with width 1280 → height = 1280 × (9/16) = 720.

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