Aspect Ratio Calculator

Adjust any image to exact dimensions with Aspect Ratio Calculator Online Free. Instant, free, no login — your images never leave your browser.

Uploading an image in the wrong aspect ratio causes automatic cropping, stretching, and poor display on every platform that shows it. This free aspect ratio calculator has three modes in one tool: calculate the exact ratio from any image or video dimensions, find the missing width or height when you know the ratio you need, and browse the complete size library for every major social media platform. Instant results. No login. No data sent to any server.

Aspect Ratio Calculator

Calculate the aspect ratio of any image or video, find the missing dimension, and explore standard social media dimensions — free, instant, no login needed.

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Know the ratio and one dimension? Find the other one instantly.

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Instagram
Square Post1080 × 10801:1
Portrait Post1080 × 13504:5
Landscape Post1080 × 5661.91:1
Story / Reel1080 × 19209:16
YouTube
Thumbnail1280 × 72016:9
Channel Art2560 × 144016:9
Profile Photo800 × 8001:1
Facebook
Cover Photo820 × 3122.63:1
Shared Image1200 × 6301.91:1
Profile Photo180 × 1801:1
LinkedIn / Twitter / Others
LinkedIn Banner1584 × 3964:1
Twitter Header1500 × 5003:1
WhatsApp DP512 × 5121:1
Blog / OG Image1200 × 6281.91:1

Three Tools in One

Mode 1 — Calculate Aspect Ratio
Enter width and height in pixels → get the simplified ratio (e.g. 16:9), decimal equivalent (1.778:1), closest standard ratio name, and orientation (landscape/portrait/square). A visual shape preview shows the proportions of your dimensions on screen.

Mode 2 — Find Missing Dimension
Enter the target ratio (e.g. 16:9) and either the width OR the height — the tool calculates the other dimension instantly. Example: ratio 16:9, width 1280px → height = 720px.

Mode 3 — Social Media Presets
Browse all standard dimensions for Instagram, YouTube, Facebook, Twitter/X, LinkedIn, and WhatsApp. Click any preset to calculate its ratio and see the visual shape preview instantly.

Standard Aspect Ratios Reference (2026)

RatioNameCommon UseOrientation
1:1SquareInstagram posts, profile photos, product imagesSquare
4:5PortraitInstagram portrait posts — most feed spacePortrait
9:16VerticalInstagram Stories/Reels, TikTok, YouTube ShortsPortrait
16:9WidescreenYouTube videos, laptop screens, web video, TVLandscape
4:3StandardOlder cameras, standard definition TVLandscape
1.91:1Social/OGFacebook link images, Open Graph, blog featuredLandscape
3:1Wide bannerTwitter/X header, wide marketing bannersLandscape
4:1Ultra-wide bannerLinkedIn banner, email headersLandscape
21:9CinematicFilm production, ultrawide monitorsLandscape

Aspect Ratio for Every Major Platform

PlatformContent TypeRatioRecommended Size
InstagramSquare Post1:11080 × 1080px
InstagramPortrait Post (best for feed)4:51080 × 1350px
InstagramStory / Reel9:161080 × 1920px
YouTubeVideo Thumbnail16:91280 × 720px
YouTubeShorts9:161080 × 1920px
TikTokVideo9:161080 × 1920px
FacebookShared Image1.91:11200 × 630px
FacebookCover Photo2.63:1820 × 312px
Twitter / XHeader3:11500 × 500px
LinkedInBanner4:11584 × 396px
Blog / OGFeatured Image1.91:11200 × 628px

Why Use This Aspect Ratio Calculator?

● Three modes in one tool — calculate a ratio, find a missing dimension, or browse social media presets.

● Visual preview — see the shape of your dimensions rendered proportionally on screen.

● Closest standard ratio detection — automatically identifies whether your dimensions match 16:9, 1:1, 4:5, or another standard.

● Complete social media preset library — all major platforms covered with exact 2026 dimensions.

● Instant calculation — no form submission or page reload required.

● Free, no login, no data sent to any server.
Resize to the exact dimensions you calculated with Image Resizer 🔗
Compress after resizing for fastest web upload with Image Compressor 🔗
Plan your Instagram feed preview here 🔗

Frequently Asked Questions

✅ What is aspect ratio and why does it matter?
Aspect ratio is the proportional relationship between the width and height of an image or video — expressed as two numbers (e.g. 16:9). It describes the shape of a frame, not its pixel size. The same 16:9 ratio exists at 1280×720 (HD) and 3840×2160 (4K). When an image's aspect ratio does not match what a platform expects, the platform crops, stretches, or letterboxes it — damaging your content's appearance.

✅ What aspect ratio should I use for Instagram posts?
Instagram supports three post ratios: 1:1 (square, 1080×1080), 4:5 (portrait, 1080×1350 — recommended as it occupies the most feed space), and 1.91:1 (landscape, 1080×566). For Stories and Reels, use 9:16 (1080×1920). The 4:5 portrait format is generally recommended for regular feed posts in 2026 as it appears largest in the feed and gets more engagement.

✅ What is a 16:9 aspect ratio?
16:9 is the standard widescreen aspect ratio used by YouTube videos, laptop and TV screens, and most web video content. Common resolutions at 16:9 include: 1280×720 (HD), 1920×1080 (Full HD), 2560×1440 (QHD), and 3840×2160 (4K UHD). All have identical proportions — just different pixel counts.

✅ How do I find the correct height for a specific aspect ratio?
Formula: Height = Width × (Ratio Height ÷ Ratio Width). Example: width 1200px at 1.91:1 → Height = 1200 × (1 ÷ 1.91) = 628px. Use the "Find Missing Dimension" tab in this tool — enter the ratio and your known dimension, and the missing dimension is calculated instantly.

✅ What is the difference between aspect ratio and image resolution?
Resolution is the actual number of pixels (e.g. 1920×1080). Aspect ratio is the proportional shape expressed as a simplified ratio (16:9). The same aspect ratio can exist at many different resolutions. Aspect ratio determines shape; resolution determines clarity and detail. Both matter for different reasons.
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