Online Aspect Ratio Calculator — Free 16:9, 4:3, 1:1 Calculator
What is an Aspect Ratio Calculator?
An aspect ratio describes the proportional relationship between width and height. Common examples include 16:9 (HD video), 4:3 (traditional TV), and 1:1 (Instagram photos). Our calculator computes the simplified ratio from any width/height and shows you which standard ratio it matches.
Why Use Our Aspect Ratio Calculator?
- Simplified ratio — Shows the ratio in its simplest form
- Common presets — Instant comparison against 16:9, 4:3, 1:1, 21:9, and 3:2
- Match detection — Highlights when your dimensions match a standard ratio
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Aspect Ratio
16:9
1.7778
16:9
1920×1080
Match
4:3
1024×768
1:1
1080×1080
21:9
2560×1080
3:2
1200×800
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How to Use
- Enter the width and height in pixels
- View the simplified ratio and decimal value
- See which common ratio it matches
Frequently Asked Questions
What aspect ratio should I use for YouTube?
16:9 (1920×1080 or 1280×720) is the standard for YouTube and most video platforms.
Is this free?
Yes, completely free.