Why do social media platforms use different aspect ratios?

Platforms optimize for user experience. Instagram uses 1:1 (square) for feed posts for consistency, 9:16 for Stories to fill mobile screens, and 4:5 for portrait posts. TikTok uses 9:16 for full-screen mobile viewing.

Aspect Ratio Calculator - Find Image & Video Dimensions

Calculate aspect ratios and find equivalent dimensions. Convert between width and height while maintaining proportions. Perfect for video, images, and design.

Calculate Aspect Ratio

Width

Height

Aspect Ratio

Scale by Ratio

Aspect Ratio

Known Value

Enter Value

Width

Height

Common Presets

Video

Photography

Devices

Visual Preview

16:9

1920 x 1080

Common Resolutions

Name	Resolution	Ratio
4K UHD	3840 x 2160	16:9
1080p Full HD	1920 x 1080	16:9
720p HD	1280 x 720	16:9
Instagram Post	1080 x 1080	1:1
Instagram Story	1080 x 1920	9:16
Twitter Post	1600 x 900	16:9
Facebook Cover	820 x 312	~2.6:1
YouTube Thumbnail	1280 x 720	16:9

Formulas

Find Ratio: Divide both by GCD

1920:1080 ÷ 120 = 16:9

Find Height from Width:

Height = Width × (Ratio Height / Ratio Width)

Find Width from Height:

Width = Height × (Ratio Width / Ratio Height)

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Frequently Asked Questions

Aspect ratio is the proportional relationship between width and height, expressed as W:H. For example, 16:9 means the width is 16 units for every 9 units of height.

16:9 is the standard for HD video, YouTube, and most TVs. 9:16 is used for vertical video (TikTok, Reels). 4:3 was the old TV standard.

Enter one dimension (width or height) and the aspect ratio. The calculator will give you the other dimension that maintains the proportion.

Divide both width and height by their Greatest Common Divisor (GCD). For 1920x1080, the GCD is 120, so 1920÷120 = 16 and 1080÷120 = 9, giving 16:9.

Images or videos will be cropped, stretched, or letterboxed (black bars). Always match your content to the platform's recommended ratio to avoid quality loss or awkward framing.

16:10 is slightly taller than 16:9. It's common on laptops and productivity monitors. 16:9 is wider and standard for entertainment. At 1920 width, 16:9 = 1080 height, 16:10 = 1200 height.

Calculate the target dimensions using our tool, then crop from the center or edge to match. For example, to get 1:1 from 16:9, crop 1920x1080 to 1080x1080 (center crop).

Common print ratios include 3:2 (standard photo prints, 4x6, 6x9), 4:5 (8x10), and 5:7 (5x7 prints). These don't match most camera sensors, so cropping is often needed.

Yes! Consistent aspect ratios create visual harmony. Cards, thumbnails, and images with matching ratios look more professional and organized in layouts.