Aspect Ratio
Client-Side SecureFree online Aspect Ratio Calculator. Calculate dimensions for screens, images, and video. Useful for responsive design and media layout.
Video & Social
Banners & Web
Print Standards
Calculator
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Understanding Aspect Ratios
Whether you are resizing a photo for Instagram, setting up a video stream, or prepping a file for print, getting the dimensions right is frustrating. This tool does the math for you. It helps you calculate new widths and heights while preserving the image shape, ensuring your content never looks stretched or squished.
Your Data is Secure
We do not upload or store your images or dimensions. This calculator runs 100% in your browser. It's just a math tool, not a data collector.
Common Screen Resolutions
Click any row to apply
| Format | Ratio | Pixels |
|---|---|---|
| Full HD (1080p) | 16:9 | 1920 x 1080 |
| 4K UHD | 16:9 | 3840 x 2160 |
| Instagram Portrait | 4:5 | 1080 x 1350 |
| Instagram Story | 9:16 | 1080 x 1920 |
Print & Paper Standards
Click any row to apply (300 DPI)
| Format | Ratio | Pixels |
|---|---|---|
| A4 Paper | 1:1.41 | 2480 x 3508 |
| Letter | 8.5:11 | 2550 x 3300 |
| 4x6 Photo | 2:3 | 1200 x 1800 |
| Business Card | 1.75:1 | 1050 x 600 |
How to use the "Lock Ratio" button?
The Lock/Unlock button is the most powerful feature here. If you have an image that is 1920x1080 and you need to resize the width to 500 pixels without distorting it, click Lock first. Then, when you type "500" in the width box, the height will automatically update to keep the image shape perfect.
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