Calculate Perfect Image Dimensions Every Time

How to Use

Enter Original Size: Add your image width and height (or pick a preset size)
Check the Ratio: See the simplified aspect ratio instantly
Set a Target: Enter either target width OR height - the other dimension calculates automatically
Optional Ratio: Choose a standard ratio like 16:9 or 1:1 for quick conversions
Copy Results: Click to copy the calculated dimensions to your clipboard

Understanding Aspect Ratios

What is Aspect Ratio?

Aspect ratio is the proportional relationship between an image's width and height.

16:9 = 1920×1080 pixels
Width is 1.78 times the height

4:3 = 1024×768 pixels
Width is 1.33 times the height

Why Aspect Ratios Matter

Platform Requirements: Each platform has optimal ratios
Instagram: 1:1, Facebook: 16:9

Print Standards: Avoid stretching or cropping
Photos: 3:2, A4: √2:1

Screen Display: Match device ratios
Laptop: 16:10, Phone: 9:16

Common Ratio Types

Landscape (Horizontal): Width > Height
16:9, 4:3, 21:9

Portrait (Vertical): Height > Width
9:16, 3:4, 2:3

Square: Equal dimensions
1:1

Calculation Methods

From Width: Height = Width ÷ Ratio
1920 ÷ 1.78 = 1080

From Height: Width = Height × Ratio
1080 × 1.78 = 1920

Simplify Ratio: Divide by GCD
1920:1080 = 16:9

Platform-Specific Guidelines

Social Media Platforms

Instagram

Feed Posts: 1:1 (1080×1080)
Stories: 9:16 (1080×1920)
Reels: 9:16 (1080×1920)

IGTV: 9:16 (1080×1920)
Profile Picture: 1:1 (320×320)

Facebook & YouTube

Facebook Posts: 16:9 (1200×630)
Facebook Cover: ~3:1 (1200×315)
YouTube Video: 16:9 (1280×720)

YouTube Thumbnail: 16:9 (1280×720)
YouTube Shorts: 9:16 (1080×1920)

Screen & Device Ratios

Computer Screens

16:9 Widescreen: 1920×1080, 2560×1440, 3840×2160

16:10 Laptop: 1920×1200, 2560×1600

21:9 Ultra-wide: 3440×1440, 2560×1080

4:3 Classic: 1024×768, 1600×1200

Mobile Devices

iPhone 14: ~9:19.5 (1170×2532)

Samsung Galaxy: ~9:20 (1440×3200)

iPad: 4:3 (2048×1536)

iPad Pro: ~4:3 (2048×2732)

Print Dimensions

Standard Print Sizes

A4 (300 DPI): 2480×3508 (~√2:1)

Letter (300 DPI): 2550×3300 (1.29:1)

4×6 Photo: 1200×1800 (2:3)

5×7 Photo: 1500×2100 (5:7)

Business Materials

Business Card: 1050×600 (1.75:1)

Poster 18×24: 5400×7200 (3:4)

Banner 3×6: 900×1800 (1:2)

💡 Pro Tips

Use the "Maintain aspect ratio" checkbox to prevent image distortion
Check platform guidelines regularly - social media sizes change occasionally
For print, always work at 300 DPI for high quality results
When in doubt, use 16:9 for landscapes and 9:16 for mobile-first content
Keep original high-resolution files and resize copies for different platforms
Test how your images look on actual devices before finalizing dimensions
Consider file size - larger dimensions mean larger files

Features

Intelligent Calculations

Enter just width OR height - the tool calculates the other dimension automatically while maintaining perfect ratios.

Comprehensive Presets

Popular sizes for social media, screens, and print. Click any preset to instantly calculate dimensions.

Multiple Formats

View ratios as simplified fractions (16:9), decimals (1.778), or percentages (177.8%) for different use cases.

Image Aspect Ratio Calculator