Image Ratio Calculator
Calculate image dimensions and aspect ratios for perfect resizing and proportions
Image Ratio & Dimension Calculator
Width in pixels or any unit
Height in pixels or any unit
Desired height for resized image
Example Calculation
iPhone Photo Resizing
Original image: 1920×1080 pixels (16:9 aspect ratio)
Want to resize for: Computer screen with 16:10 ratio
Keep height at: 1080 pixels
Calculate new width: W2 = H2 × (W1/H1)
Calculation Steps
W2 = 1080 × (1920/1080)
W2 = 1080 × 1.778
W2 = 1920 pixels
Result: 1920×1080 maintains original 16:9 ratio
Common Aspect Ratios
Image Resizing Tips
Always maintain aspect ratio to prevent distortion
Use whole numbers for pixel dimensions when possible
Consider your target platform's preferred ratios
16:9 is most common for web and video content
Square (1:1) works best for social media profiles
Understanding Image Aspect Ratios
What is Aspect Ratio?
Aspect ratio is the proportional relationship between an image's width and height. It's expressed as two numbers separated by a colon (like 16:9) or as a decimal (like 1.778). This ratio determines the shape of your image and how it will appear on different devices and platforms.
Why is it Important?
- •Prevents image distortion during resizing
- •Ensures consistent appearance across devices
- •Optimizes display for specific platforms
- •Maintains professional image quality
Calculation Formula
W1/H1 = W2/H2
(Maintaining aspect ratio)
- W1, H1: Original width and height
- W2, H2: New width and height
- Calculation: W2 = H2 × (W1/H1)
- Or: H2 = W2 × (H1/W1)
Remember: Always calculate one dimension from the other to maintain proportions
Platform-Specific Recommendations
Social Media
- • Instagram: 1:1 (square) or 4:5
- • Facebook: 16:9 or 1.91:1
- • Twitter: 16:9 or 2:1
- • YouTube: 16:9
Web & Digital
- • Website banners: Various
- • Blog images: 16:9 or 3:2
- • Thumbnails: 16:9 or 1:1
- • Email headers: Wide ratios
Print & Traditional
- • 4×6 photos: 3:2
- • 8×10 photos: 4:5
- • A4 paper: 1:1.414
- • Business cards: Various