Aspect Ratio Calculator

Width	Rounded height	Exact height	Pixels
320 px	180 px	180 px	57,600
640 px	360 px	360 px	230,400
960 px	540 px	540 px	518,400
1,280 px	720 px	720 px	921,600
1,920 px	1,080 px	1,080 px	2,073,600
2,560 px	1,440 px	1,440 px	3,686,400
3,840 px	2,160 px	2,160 px	8,294,400

Width

Rounded height

Exact height

Pixels

320 px

180 px

57,600

640 px

360 px

230,400

960 px

540 px

518,400

1,280 px

720 px

921,600

1,920 px

1,080 px

2,073,600

2,560 px

1,440 px

3,686,400

3,840 px

2,160 px

8,294,400

How to Use the Aspect Ratio Calculator

Enter a width and height to simplify their relationship, or select a familiar preset. Then choose which pixel dimension you already know. The calculator finds the matching side without changing the selected proportion. The preview and reference table update immediately.

1
Set the ratio
Use dimensions such as 1920 × 1080, ratio parts such as 16 × 9, or choose a preset.
2
Enter one dimension
Select known width or known height and add the pixel value you need to preserve.
3
Use the result
Copy the matching size, use the CSS value, or export the common-dimensions table.

What an Aspect Ratio Tells You

An aspect ratio compares width with height; it does not describe one fixed resolution. A 16:9 frame can be 1280 × 720, 1920 × 1080, or any other proportional size. The first value describes horizontal units and the second describes vertical units. Landscape ratios are wider than they are tall, portrait ratios are taller than they are wide, and 1:1 is square.

Width and Height Formulas

Find height

height = width × ratio height ÷ ratio width

Find width

width = height × ratio width ÷ ratio height

To simplify an integer ratio, divide both values by their greatest common divisor. For example, 1920 and 1080 share a divisor of 120, so 1920:1080 becomes 16:9. The decimal representation is width divided by height: 16 ÷ 9 is approximately 1.7778.

Common Ratios for Images, Video, and Interfaces

Ratio	Example dimensions	Typical use
16:9	1920 × 1080	Widescreen video and displays
9:16	1080 × 1920	Vertical video and stories
1:1	1080 × 1080	Square images and posts
4:5	1080 × 1350	Portrait social images
3:2	1800 × 1200	Photography and prints
4:3	1600 × 1200	Classic screens and presentations

These are common examples, not permanent publishing rules. Platforms and placements can change their recommended dimensions, file sizes, and safe areas, so verify the current specification before exporting.

Ratio Changes, Cropping, and Letterboxing

Matching dimensions preserve a source only when the source already has the same ratio. Converting a 4:3 image to 16:9 requires a design decision: crop part of the image, fit the complete image with empty space, or distort it. Stretching changes the shape of the content and is usually undesirable. Use a crop or fit workflow when ratios differ.

Private, Browser-Based Calculation

All ratio math, previews, copying, and CSV creation happen locally in your browser. No image or video upload is required because the tool only processes the dimensions you enter.

Continue Your Image & Design Workflow

Apply the calculated dimensions with the Image Resizer, change framing with the Image Cropper, reduce the exported file using the Image Compressor, or check text and background colors with the Color Contrast Checker.

Aspect Ratio Calculator

Set the Ratio

Calculate Matching Dimensions

Copy or Download the Result

Common Dimension Reference