Dimension Ratio Calculator

Last updated: 07 Aug 2025 | Author: Brij | Review By: Irshad

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Use our Dimension Ratio Calculator to easily calculate aspect ratios from width and height values. Get simplified ratios and decimal values instantly with formulas and examples.

Width:

Height:

Dimension Ratios

Aspect Ratio (W:H):

Simplified Ratio:

Decimal Ratio (W÷H):

What is a Dimension Ratio?

A dimension ratio, also known as an aspect ratio, is a proportional relationship between the width and height of any rectangular object such as a screen, image, or video frame. It's typically written in the format W:H, where:

W is the Width
H is the Height

How to Calculate the Dimension Ratio

To calculate the dimension ratio, follow these steps:

1. Get the Width and Height

Let the width be W and the height be H.

2. Simplify the Ratio

To simplify the ratio, divide both width and height by their greatest common divisor (GCD).

Formula:

$\text{Aspect Ratio} = \frac{W}{\text{GCD}(W, H)} : \frac{H}{\text{GCD}(W, H)}$

3. Decimal Ratio (Optional)

You can also represent the ratio as a decimal by dividing the width by the height.

Formula:

$\text{Decimal Ratio} = \frac{W}{H}$

Example Calculation

Let’s say you have:

Width = 1920
Height = 1080

Step 1: Find GCD

$\text{GCD}(1920, 1080) = 120$

Step 2: Simplify the Ratio

$\text{Aspect Ratio} = \frac{1920}{120} : \frac{1080}{120} = 16:9$

Step 3: Decimal Ratio

$\text{Decimal Ratio} = \frac{1920}{1080} = 1.777...$

So, the dimension ratio is 16:9, and the decimal ratio is approximately 1.78.

Why Use a Dimension Ratio Calculator?

Saves time on manual GCD calculation.
Avoids errors in scaling images or videos.
Useful for design, printing, photography, and web development.

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