Image Aspect Ratio Calculator
Find simplified image proportions (4:3, 16:9, 1:1) and compute target crop dimensions for ad photos.
Understanding the Image Aspect Ratio Calculator
Marketplaces like eBay, Leboncoin, and Facebook format gallery images into specific ratios (such as square 1:1 or standard 4:3). This tool finds simplified ratios and calculates exact crop dimensions.
How to Use This Tool
Enter original pixel width and height, or choose a desired ratio and target width to discover the proportional height.
Calculation Methodology & Formula
The underlying calculation applies the following deterministic mathematical logic:
Computes Greatest Common Divisor (GCD) using the Euclidean algorithm: GCD(W, H). Simplified Ratio = (W / GCD) : (H / GCD). Proportional Dimension: Target Height = (Target Width / Original Width) × Original Height.
Practical Classifieds Example
Real-World Scenario: An image measuring 4032 × 3024 pixels simplifies to a classic 4:3 camera ratio. Resizing to 1200px width yields an exact height of 900px.
Important Limitations & Assumptions
Image Aspect Ratio Calculator FAQs
1:1 (square) and 4:3 (standard photo) are the most universally supported ratios across mobile marketplace grids.
If you upload extreme widescreen (16:9) or vertical portrait photos to a square grid, the platform may auto-crop out the top and bottom of your item.
Aspect ratio itself does not affect file size; total pixel resolution (width × height) and compression settings determine file weight.
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