Aspect Ratio Calc is a free browser-based tool that runs entirely in your browser. No file uploads, no account needed, and no data stored. Fast, private and always free.
This tool lets you calculate aspect ratios for video & images without installing any software or creating an account. Everything runs directly in your browser for maximum privacy. Your files and data never leave your device.
Use it for quick tasks at any time from any device — desktop, tablet or mobile. No subscription, no ads, no limits.
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Instant results
No server processing or wait
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100% private
Files stay on your device
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Always free
No subscription or fees
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Mobile ready
Works on any device
How to use Aspect Ratio Calc
Open the Aspect Ratio Calc tool
Enter your input data or upload your file
Configure the settings for your use case
Download or copy the result
Why use OnlineToolsPlus?
OnlineToolsPlus processes everything locally in your browser. Your files, text and data never leave your device, which eliminates server-side privacy risks. With 200+ free tools covering PDF, image, AI writing, developer utilities, calculators, SEO, color tools and more, there is no need to juggle multiple subscriptions or install software.
Frequently asked questions
What is an aspect ratio?
Aspect ratio is the proportional relationship between width and height. 16:9 means for every 16 units of width there are 9 units of height. It defines the shape of an image or video without specifying actual dimensions.
What aspect ratio should I use for YouTube videos?
16:9 is the standard for YouTube and most video platforms. 1:1 is used for Instagram square posts. 9:16 is used for vertical video (Reels, TikTok, YouTube Shorts).
How do I calculate a height from a width?
Enter the width and the aspect ratio. The calculator shows the corresponding height that maintains the ratio.
What aspect ratio are standard photos?
Most digital cameras capture at 4:3 or 3:2. Most computer screens are 16:9. This mismatch is why phone photos sometimes have letterboxing when displayed on a widescreen monitor.