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Image Aspect Ratio Calculator

Reduce dimensions to a simple ratio and calculate a width or height without uploading an image.

  • Ratio reduction
  • Dimension calculation
  • No file required
Online tool

Try the tool

Add your data, choose the settings, and get the result.

Input

Result

16:9

Height: 720 px

Your data stays here

Text and selected files are processed in the current browser and are not sent to a server to produce the result.

Reviewed: 2026-07-17
01

How to use it

  1. 1

    Enter source width and height to reduce the ratio.

  2. 2

    Or enter a ratio and one known dimension.

  3. 3

    Read the calculated width or height.

02

What the tool can do

  • Reduction of positive integer dimensions using the greatest common divisor.
  • Height calculation from width and ratio.
  • Width calculation from height and ratio.
03

Common use cases

  • Checking the ratio of 1920×1080 or another size.
  • Calculating responsive block height from width.
  • Preparing exact dimensions for resizing.
04

How it works inside

For example, 1920:1080 reduces to 16:9.

A calculated dimension can be fractional and may need rounding for pixel output.

05

Questions and answers

Do I need to upload an image?

No. The tool works only with entered numbers.

What is the Full HD aspect ratio?

1920×1080 reduces to 16:9.