Aspect Ratio Calculator
Calculate and convert aspect ratios for images and video. Find dimensions, resize proportionally, and browse social media presets.
Calculate Aspect Ratio
Enter width and height to find the simplified aspect ratio.
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Aspect Ratio
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Decimal
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Megapixels
Find Missing Dimension
Enter an aspect ratio and one dimension to calculate the other.
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Calculated Width
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Calculated Height
Resize Calculator
Enter current dimensions and a target width or height to resize proportionally.
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New Width
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New Height
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Megapixels
Common Aspect Ratios
| Ratio | Decimal | Common Use |
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Social Media Presets
Click any preset to load its dimensions into the calculator above.
| Platform | Type | Dimensions | Ratio |
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Frequently Asked Questions
How do I calculate the aspect ratio of an image?▾
Enter the width and height of your image in pixels. The tool instantly calculates and simplifies the aspect ratio (e.g., 1920x1080 becomes 16:9) and shows the megapixel count.
How do I find the missing dimension for a specific aspect ratio?▾
Select or enter an aspect ratio (e.g., 16:9), enter either the width or height, and the tool calculates the other dimension to maintain the exact ratio.
What are the correct image sizes for social media?▾
This tool includes presets for Instagram posts (1080x1080), Instagram Stories (1080x1920), YouTube thumbnails (1280x720), Facebook covers (820x312), Twitter headers (1500x500), and LinkedIn banners (1584x396).
Is my data safe when using this aspect ratio calculator?▾
Yes. All calculations happen entirely in your browser. No data is ever sent to a server.