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Image Aspect Ratio Calculator

Work out ratios and missing dimensions without an image.

Image Tools Reviews Free · no sign-up

Type any two values and the rest are calculated. No image needed — this is arithmetic.

Common aspect ratios

Ratio Decimal Typical size Where it is used
1:1 1.000 1080 × 1080 Square social posts, avatars, product grids
4:5 0.800 1080 × 1350 The tallest post most feeds accept
9:16 0.563 1080 × 1920 Stories, reels and shorts
16:9 1.778 1920 × 1080 Video, slides, YouTube thumbnails
1.91:1 1.910 1200 × 630 Link preview cards on most platforms
3:2 1.500 1800 × 1200 Photographic prints, most cameras
2:3 0.667 1200 × 1800 Portrait prints, book covers
4:3 1.333 1600 × 1200 Older cameras, projectors, tablets
21:9 2.333 2560 × 1080 Ultrawide monitors and cinematic crops
1:1.414 0.707 2480 × 3508 A-series paper at 300 DPI

Quick Tool Overview

The Image Aspect Ratio Calculator answers the two questions that come up constantly: what ratio a pair of dimensions makes, and what the missing dimension should be for a target ratio. No image needed. Ratios are reduced and matched against the standards, so 1456 by 816 is named as 16:9 rather than 91:51.

What it does
Calculates ratios and missing dimensions
You give it
Any two of width, height and ratio
You get back
The rest, calculated as you type
Best for
Resizing proportionally and matching specs
Image Tools Free, unlimited use No sign-up Runs in your browser

About the Image Aspect Ratio Calculator

Two questions come up constantly and both are arithmetic: what ratio is 1456 by 816, and if I need it 1200 wide what should the height be?

Both are answered here, and no image is needed — this is a calculator, not an inspector. Type any two of the four values and the others follow. The ratio is reduced to its simplest whole-number form and matched against the standard ones, so you find out that 1456 by 816 is 16:9 rather than being handed 91:51. A reference table of every common screen, social and print ratio sits alongside.

Key features of the Image Aspect Ratio Calculator

Works in every direction

Type any two of the four values and the others follow, rather than one fixed calculation.

Names the standard ratio

A simplified ratio close to a standard one is identified as such, which is usually what you actually wanted to know.

No image required

This is arithmetic, so it works from numbers alone — useful when you are planning rather than editing.

Reference table

Every common screen, social and print ratio with its typical pixel dimensions, on the same page.

Instant

Everything recalculates as you type, with no button to press.

How to use the Image Aspect Ratio Calculator

  1. 1

    Type what you know

    Original width and height, or a ratio and one dimension.

  2. 2

    Read what follows

    The missing values are calculated as you type.

  3. 3

    Check the named ratio

    The simplified ratio is matched against the standards, so 16:9 is named as such.

  4. 4

    Use the reference table

    Every common screen, social and print ratio with its typical pixel sizes.

Frequently asked questions

The proportion between width and height, written as two numbers. 16:9 means sixteen units wide for every nine tall, whatever the actual pixel size.

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