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ALTREPO/Calculators/ASPECT RATIO CALCULATOR: IMAGE DIMENSIONS & PIXELS

Aspect Ratio Calculator: Image Dimensions & Pixels

Instantly calculate aspect ratios from width and height dimensions, find a missing dimension, or drag & drop an image to read its size natively without uploading.

Resolution (Pixels / Units)
W:
×
H:
Aspect Ratio
:
Common Presets

Drag & Drop an image here

Processed locally. No uploads.
16:9 1920 1080
Aspect Ratio Comparison Diagram A premium technical illustration showing 16:9 and 4:3 aspect ratios overlapping. 16:9 WIDESCREEN WIDTH (e.g. 1920px) 4:3 STANDARD HEIGHT
Aspect ratio dictates the proportional dimensions of an image or screen,
comparing the total width to the total height.

Aspect Ratio Calculator FAQ

How to calculate aspect ratio?

To calculate aspect ratio, find the Greatest Common Divisor (GCD) of the width and height, and divide both dimensions by that number. For example, the GCD of 1920 and 1080 is 120. 1920 / 120 = 16, and 1080 / 120 = 9, so the ratio is 16:9.

How to find aspect ratio from an image?

You can find an image's aspect ratio by right-clicking it, checking its properties for width and height, and calculating the ratio. Alternatively, just drag and drop the image into our calculator above to find it instantly.

What are common aspect ratios?

Common aspect ratios include 16:9 (standard widescreen for TVs and YouTube), 4:3 (older TVs and iPads), 1:1 (square, popular on Instagram), and 9:16 (vertical video for TikTok and Reels).