Aspect Ratio Calculator
Calculate, simplify, and scale dimensions while preserving exact aspect ratios for video, photography, and responsive web design.
Aspect ratio locked to 16:9. Changing one dimension recalculates the other.
Aspect Ratio Standards & Common Device Resolutions
| Aspect Ratio | Decimal | Common Applications | Popular Resolution |
|---|---|---|---|
| 16:9 | 1.78:1 | Full HD TV, YouTube videos, PC monitors | 1920 × 1080 (1080p) |
| 9:16 | 0.56:1 | TikTok, Instagram Reels, YouTube Shorts, Stories | 1080 × 1920 |
| 1:1 | 1.00:1 | Instagram feed posts, profile pictures, favicons | 1080 × 1080 |
| 4:5 | 0.80:1 | Instagram vertical feed photos (maximum screen area) | 1080 × 1350 |
| 4:3 | 1.33:1 | Apple iPad screens, CRT displays, old films | 1024 × 768 / 2048 × 1536 |
| 21:9 | 2.33:1 | Ultrawide gaming monitors, Anamorphic cinema | 3440 × 1440 |
| 3:2 | 1.50:1 | DSLR & mirrorless 35mm photography, Microsoft Surface | 1800 × 1200 / 3000 × 2000 |
How it works?
Enter Width and Height
Input any custom pixel, point, or millimeter dimensions into the width and height fields.
Lock Aspect Ratio
Keep the aspect ratio lock engaged so adjusting either width or height dynamically recalculates the other dimension without distortion.
Select Presets or Scale
Choose from industry-standard aspect ratios, popular social media and video resolutions, or scale up and down with instant multiplier buttons.
Copy Formats & Code
Copy final dimensions, simplified mathematical ratios, or CSS code snippets (aspect-ratio: 16/9) with one click.
Tips & Best Practices
- •Preserving Image Sharpness: When scaling images for web design, always scale proportionally to avoid stretched or squished graphics. Standard responsive web images use 16:9 or 4:3.
- •Social Media Platform Rules: Instagram posts perform best at 4:5 (1080×1350) or 1:1 (1080×1080), while TikTok, YouTube Shorts, and Instagram Reels require vertical 9:16 (1080×1920).
- •Modern CSS aspect-ratio Property: Instead of legacy padding-bottom padding hacks, modern browsers natively support the CSS property 'aspect-ratio: 16 / 9' for fully responsive elements.
- •100% Client-Side Privacy: All dimension math, scaling calculations, and previews execute strictly within your local browser memory with zero network requests.
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