Code & web

Aspect ratio calculator

Find the aspect ratio (16:9, 4:3…) of an image or video, and the right height for a new width.

Embed this calculator on your website

Copy this code and paste it into your page (WordPress, Wix, Webflow, HTML…). It's free: please keep the link to HOD Calc.

<iframe src="https://calc.hod-group.com/embed/?hodtool=ratio&amp;hodlang=en" title="Aspect ratio calculator" loading="lazy" style="width:100%;max-width:720px;height:560px;border:0;border-radius:12px" data-hodcalc></iframe>
<p style="font:13px sans-serif;margin:6px 0 0">Calculator by <a href="https://calc.hod-group.com/en/aspect-ratio-calculator/">HOD Calc</a></p>
<script async src="https://calc.hod-group.com/assets/embed.js"></script>

How it works

The ratio is width:height simplified by their GCD. New height = new width × height / width.

Results are for guidance only and do not replace professional advice.

Worked example

With the default values:

Width (px)1920
Height (px)1080
New width (px)1280

you get:

Aspect ratio16:9
As a decimal1.7778 : 1
New height for 1,280 px720 px
Megapixels2.07 MP

Frequently asked questions

How does the “Aspect ratio calculator” tool work?

The ratio is width:height simplified by their GCD. New height = new width × height / width.

What do I need to enter?

Just fill in: width, height, new width. The result updates as you type.

Can you give an example?

Width (px): 1920; Height (px): 1080; New width (px): 1280 → Aspect ratio: 16:9; As a decimal: 1.7778 : 1.

Is this calculator free, and is my data private?

Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.