Aspect Ratio Calculator: Find Missing Width or Height Instantly

Instantly calculate missing width or height for any aspect ratio! Supports 16:9, 4:3, 21:9 & custom ratios. Perfect for video, design, and resizing. Try it now, 100% free!

Common Presets

Ratio Width

Ratio Height

Pixel Width

Pixel Height

How to Use This Calculator

1.a.i.
Select a ratio → Choose from Common Presets 16:9 (YouTube), 4:3 (iPad), 21:9 (ultrawide), or enter a custom ratio.
2.b.ii.
Enter one value → Width or height ( leave the other blank ).
3.c.iii.
Get the result instantly! → The missing dimension calculates automatically.
4.d.iv.
Copy with ease → Click the copy button next to any value to copy it to your clipboard.

Example: For a 16:9 video at 1920px width, height = 1080px ( click the copy button to save this value! )

Tip: Change either value at any time - the calculator updates in real-time!

Common Aspect Ratios & Uses

Ratio	Name	Best For	Popular Resolutions
16:9	Widescreen	YouTube, Netflix, Gaming	1920×1080, 1280×720
4:3	Standard	Old TVs, Retro Games	1024×768, 800×600
1:1	Square	Instagram Posts	1080×1080
3:2	Classic Photography	DSLR Cameras, Prints	3600×2400, 1800×1200
16:10	Widescreen (Alternate)	Productivity Monitors	1920×1200, 1680×1050
21:9	Ultra Widescreen	Cinematic Movies, Gaming	3440×1440, 2560×1080
32:9	Super Ultra Widescreen	Immersive Displays	5120×1440, 3840×1080
2.39:1	CinemaScope	Hollywood Films	4096×1716, 2048×858
2.35:1	Anamorphic Widescreen	Feature Films	2350×1000
2.76:1	Ultra Panavision 70	Epic Cinema (Ben-Hur)	2760×1000
1.85:1	Theatrical Widescreen	Modern Movies	1850×1000
5:4	Old Monitor	Vintage Displays	1280×1024
18:9	Univisium/Mobile	Smartphones	2160×1080
2:1	Univisium	Digital Cinema	2000×1000
4:1	Super Wide	Panoramic Views	4000×1000
Custom	-	Any unique design needs	Any size!