Free Aspect Ratio Calculator
Calculate aspect ratios, lock proportions, and see pixel dimensions for common resolutions. Essential for video, image, and responsive design work. No signup required.
100% free — no account needed
16:9
1920 x 1080 px
Resolution Table
| Width (px) | Height (px) | Height |
|---|---|---|
| 320px | 180px | 57,600 |
| 640px | 360px | 230,400 |
| 768px | 432px | 331,776 |
| 1024px | 576px | 589,824 |
| 1280px | 720px | 921,600 |
| 1440px | 810px | 1,166,400 |
| 1920px | 1080px | 2,073,600 |
| 2560px | 1440px | 3,686,400 |
| 3840px | 2160px | 8,294,400 |
Free Aspect Ratio Calculator Features
Calculate and lock aspect ratios for any dimension
Auto Calculation
Enter width and height to instantly see the simplified aspect ratio.
Lock Proportions
Lock the ratio and change one dimension — the other auto-calculates.
7 Common Presets
Quick access to 1:1, 4:3, 16:9, 9:16, 4:5, 2:3, and 21:9.
Resolution Table
See pixel dimensions for 9 common widths at your chosen ratio.
FAQ
What aspect ratio should I use for social media?
1:1 for Instagram feed, 9:16 for Stories/Reels/TikTok, 16:9 for YouTube, 4:5 for Instagram portrait posts, 2:3 for Pinterest.
How is the ratio calculated?
We find the greatest common divisor (GCD) of width and height, then divide both by the GCD to get the simplest ratio.
What does 'lock ratio' do?
When locked, changing the width automatically recalculates the height (and vice versa) to maintain the current aspect ratio.
Create Perfectly Sized Content
Use AdaptlyPost's image tools for platform-perfect posts.