Aspect Ratio Calculator
Width + Height → Ratio
16:9
Ratio + Dimension → Other
Calculated height
1080 px
Frequently Asked Questions
Everything you need to know about aspect ratio
What is the aspect ratio?
The aspect ratio is the ratio between the width and height of an image or screen. E.g.: 16:9 means for every 16 units of width there are 9 units of height. It is essential to avoid distortions when resizing.
What are the most common aspect ratios?
16:9 is the standard for modern TVs and monitors. 4:3 was the standard for old TVs and monitors. 1:1 is the square format used on Instagram. 9:16 is the vertical format for stories/reels. 21:9 is the ultrawide format for cinema.
How do you maintain the aspect ratio when resizing?
To resize while maintaining the ratio: new_height = new_width × (original_height / original_width). The inverse formula is used to find the width. This tool calculates it automatically.
How is an aspect ratio worked out from width and height?
The aspect ratio comes from dividing width and height by their greatest common divisor. From 1920 by 1080 the calculator returns 16:9, because both numbers divide by 120.
How do I find the height and keep the proportions?
With the ratio and the width known, the height comes from multiplying the width by the second number of the ratio and dividing by the first. The calculator does the arithmetic and returns the pixels.
Which aspect ratios are ready to use?
The calculator has buttons for 16:9, 4:3, 1:1, 9:16, 21:9 and 3:2. 16:9 is the format of televisions and monitors, 9:16 the vertical one of stories and reels, 1:1 the square, 21:9 the ultrawide.
Does my data stay private?
Yes, and not because we promise it: this tool runs entirely inside your browser. What you type or upload never leaves your device, so it never reaches a server of ours and there is nothing we could keep, read or lose. You can check it yourself: open the page, disconnect from the internet, and the tool keeps working.
Do you store what I enter?
No. There is no database behind this tool: we do not store your files, your text or your results. When you close the tab nothing is left — not here with us, because it never arrived, and not anywhere else.
Do you profile me? Are you GDPR compliant?
We do not profile you: there is no account to create, we never ask for your email to use a tool, and we keep no profile of what you do. We are an Italian company and we work under the GDPR and the other European rules, with the privacy notice and the consent request in plain sight. One thing we say in full rather than hiding it behind a slogan: the ads on the page are Google's, and Google may use cookies to personalise them. You decide from the consent banner: if you say no the ads stay, but they are not personalised, and the tool works exactly the same.
If it is free, how do you make money?
From the ads on the page, and that is all. We do not sell your data, there is no hidden paid plan, there is no limit that eventually asks for your card, and you do not have to sign up. The ads pay for the servers and for the time we spend writing the tools: that is how we can keep them open to everyone.