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Aspect Ratio Calculator
Aspect ratio is a picture’s width compared with its height, written as two numbers such as 16:9 or 9:16. Type a width and height to get the ratio, or pick a ratio and type one side to get the other. A vertical Reel, TikTok or Short is 9:16, usually 1080 × 1920 pixels.
Aspect ratio of 1920 × 1080
16:9
1.78:1 as a decimal
A standard ratio.
Preview to scale
Video encoders such as H.264 usually store color at half the width and height (4:2:0), so they need both sides to be even.
Size at 9:16
1080 × 1920
Preview to scale
How to use it
How to use the aspect ratio calculator
- 1Type a width and height, or pick a ratio or a platform preset.
- 2To keep a ratio, choose Find the missing side: change either side and the other updates.
- 3Copy the size you need.
FAQ
Questions
What aspect ratio is a Reel, TikTok or YouTube Short?
All three are vertical 9:16 videos. 1080 × 1920 pixels is the usual size.
What is 16:9 in pixels?
Common 16:9 sizes are 1280 × 720 (720p), 1920 × 1080 (1080p) and 3840 × 2160 (4K).
How do I calculate an aspect ratio?
Divide the width and height by their greatest common divisor. 1920 × 1080 divides by 120 to give 16:9.
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