Aspect Ratio Calculator
PRO · DARKPrecision dimension scaler, visual framing engine & code generator
Resolution Dimension Scaler
Width (pixels)
PX
Height (pixels)
PX
Quick Ratios
16:9
HD/4K
9:16
Shorts/Reels
4:3
Classic/TV
1:1
Square Post
4:5
IG Portrait
21:9
Ultrawide
3:2
35mm DSLR
2.39:1
Cinema
Target Dimension Solver
Locks exact current ratio
If Target Width is:
PX
Calculated Height
720 px
If Target Height is:
PX
Calculated Width
1280 px
Proportional Visual Stage
16:9
1920 × 1080
W: 1920px
H: 1080px
Total Pixels
2,073,600
Megapixels
2.07 MP
Diagonal Px
2,203 px
GCD Divisor
120
💡 Mathematically verified with Euclidean GCD reduction. 100% private in-browser computation.
Standard Industry Presets
Click any card to apply dimensions directly into the calculator.
4K Ultra HD
16:9
3840 × 2160 px
YouTube 2160p, UHD TVs, high-res editing
1080p Full HD
16:9
1920 × 1080 px
Standard broadcast, desktop monitors, web video
TikTok & Reels
9:16
1080 × 1920 px
Vertical video for mobile feeds & YouTube Shorts
Instagram Portrait
4:5
1080 × 1350 px
Maximum vertical timeline space without crop
Square Post
1:1
1080 × 1080 px
Profile avatars, classic Instagram square feed
Ultrawide 1440p
21:9
3440 × 1440 px
Panoramic curved monitors & gaming displays
CinemaScope
2.39:1
3840 × 1607 px
Anamorphic cinematic theatrical feature films
35mm Sensor
3:2
6000 × 4000 px
24MP full-frame DSLR and mirrorless cameras
Batch Resolution Multipliers
Pre-computed asset scales maintaining current aspect ratio.
| Scale Factor | Dimensions (W × H) | Megapixels | Target Output | Action |
|---|
Developer & Designer Code Snippets
Production-ready CSS and markup for web responsive layouts.
Modern CSS Property
aspect-ratio: 16 / 9;
Tailwind CSS Class
aspect-video
React / JSX Style Prop
style={{ aspectRatio: '16 / 9' }}
SVG viewBox Attribute
viewBox="0 0 1920 1080"
Aspect Ratio Guide & Frequently Asked Questions
Helpful explanations of aspect ratios, resolution scaling, and responsive design.
What does this aspect ratio calculator do?
▼
It takes any width and height, simplifies them down to their lowest integer ratio (like 16:9 or 4:3) using the greatest common divisor (GCD), and lets you scale either side while preserving proportions without stretching or squishing visuals.
What is the difference between aspect ratio and resolution?
▼
Resolution is the exact count of pixels on a display (e.g. 1920×1080 = 2,073,600 pixels). Aspect ratio describes the proportional relationship between the width and height regardless of physical size (16 units wide for every 9 units tall).
How do I preserve aspect ratio in web design?
▼
In modern CSS, you can apply
aspect-ratio: 16 / 9; directly to container elements or images. In Tailwind CSS, utilities like aspect-video and aspect-square enforce responsive ratios across devices.
Does this tool transmit or store my data?
▼
No. All calculations run client-side in your web browser. Nothing is sent to an external server, guaranteeing 100% privacy and zero latency.