Aspect Ratio Calculator

Calculate pixel dimensions from aspect ratios with precision

Longest Side (px):

Custom Ratio:

Divisible by 16:

Widescreen

16:9

Standard

4:3

Square

1:1

Ultrawide

21:9

Classic Photo

3:2

Large Format

5:4

Portrait

2:3

Mobile Portrait

9:16

Cinema

1.85:1

Anamorphic

2.39:1

Golden Ratio

1.618:1

US Letter

8.5:11

Calculated Dimensions

Width: -

Height: -

Aspect Ratio: -

Total Pixels: -

Adjustment: -

Longest Side Help

Enter the pixel value for the longest side of your desired dimensions. The calculator will automatically determine which side (width or height) should be the longest based on your selected aspect ratio and calculate the shorter side accordingly.

Example: If you enter 1920px and select 16:9, you'll get 1920×1080 (landscape) or 1080×1920 (portrait) depending on the ratio orientation.

Custom Ratio Help

Enter your own custom aspect ratio using width and height values. You can use whole numbers or decimals.

Examples:

16:9 for widescreen
1.5:1 for a custom ratio
3:4 for portrait orientation

The calculator will use these values along with your longest side input to determine the final pixel dimensions.

Divisible by 16 Help

When enabled, this option rounds both width and height to the nearest numbers divisible by 16. This is useful for:

Video encoding: Many codecs work more efficiently with dimensions divisible by 16
GPU processing: Graphics cards often perform better with aligned memory blocks
Compression: Better compression ratios in many formats

Note: The aspect ratio may be slightly adjusted to accommodate the divisibility requirement.