Video Aspect Ratio Calculator
Free Online Tool
What is an Aspect Ratio Calculator?
An aspect ratio calculator is a simple tool that helps you find the correct width and height of videos or images while keeping their proportions accurate. Whether you’re editing video, creating graphics for social media, or preparing files for professional design projects, keeping the right aspect ratio ensures your content looks perfect across every platform.
Our free tool makes it easy:
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Choose a preset like 16:9, 9:16, 4:5, 1:1 and more
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Enter a width or height in pixels
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Instantly see the matching value calculated for you
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Switch between light or dark mode for comfortable use
This calculator works directly in your browser – no downloads, no signups.
Popular Presets Available
in the Calculator
Our tool includes the most commonly used ratios:
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16:9 – Standard video, YouTube, Full HD, 4K
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9:16 – Vertical videos, TikTok, Instagram Reels, YouTube Shorts
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4:5 – Instagram portrait posts
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1:1 – Square format for feeds
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4:3 – Classic video and photography
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21:9 – Ultra-wide cinema screens
You can also select Custom to enter your own ratio for specialist projects.
Consistency Across Every Screen
Maintaining the correct aspect ratio is essential for:
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Video production – avoid stretched or squashed footage
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Social media content – keep TikTok, Instagram, YouTube Shorts, and Facebook videos looking sharp
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Photography – crop without distortion
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Design & presentations – deliver professional layouts with the right proportions
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An incorrect aspect ratio can cause black bars, pixel distortion, or cropping in the wrong places. Using an aspect ratio calculator avoids all of these problems.
Why Aspect Ratios Matter
How This Calculator Helps
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Saves time – no need for manual maths or ratio charts
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Prevents mistakes – accurate pixel dimensions every time
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Free & online – use it instantly without downloads
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Flexible – works for video editors, graphic designers, marketers, and photographers
Whether you’re a professional video producer or just resizing a clip for social media, our aspect ratio calculator makes the process fast and accurate.
What is aspect ratio?
Aspect ratio is the relationship between the width and height of a video or image, usually written as W:H (for example, 16:9).
Why do I need an aspect ratio calculator?
It ensures your video or image keeps the correct proportions when resizing. Without it, content may look stretched, squashed, or cropped incorrectly.
Can I use custom sizes?
Yes. Enter your own ratio or custom pixel dimensions to instantly see the correct values.
Does this work for social media?
Absolutely. You can use presets for Instagram, TikTok, YouTube, and more.
Frequently Asked Questions
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