Aspect Ratio Calculator

Understanding the Math

Aspect ratio calculation is based on the principle of direct proportionality. The fundamental formula used in this calculator is:

$$\frac{W_1}{H_1} = \frac{W_2}{H_2}$$

Where:

• $W_1, H_1$ are the base ratio values (e.g., 16 and 9).

• $W_2, H_2$ are the actual dimensions in pixels.

To find a missing dimension, we cross-multiply:

• To find New Height: $H_2 = \frac{W_2 \times H_1}{W_1}$

• To find New Width: $W_2 = \frac{H_2 \times W_1}{H_1}$

Key Features

1. Bi-directional Calculation: If you change the Width, the Height updates automatically to match the ratio. If you change the Height, the Width follows suit.

2. GCD Algorithm: Included a Greatest Common Divisor function to "simplify" the ratio at the bottom (e.g., converting 1920:1080 into its simplest 16:9 form).

3. Ratio Presets: Quick-access chips for industry-standard ratios like Ultrawide (21:9) and Social Media Story (9:16).

4. Floating Point Support: The step="any" attribute allows for precise calculations involving decimals.

Aspect Ratio

Adjust any value to maintain the proportion.

Ratio Width

Ratio Height

Pixel Width

Pixel Height

1:1

4:3

16:9

21:9

9:16 (Mobile)

Current Ratio: 16:9