Aspect Ratio Calculator
Calculate and convert aspect ratios for images, video, and screens
Settings & input
Quick presets & examples
Your inputs are never uploaded or stored.
Results
Enter your values to see the results.
About Aspect Ratio Calculator
Our free Aspect Ratio Calculator helps you determine the proportional relationship between width and height for images, videos, screens, and any rectangular media. Enter any width and height in pixels to instantly see the simplified aspect ratio, decimal ratio, total pixel count, and megapixels.
The tool features a powerful lock ratio mode that lets you resize dimensions while automatically maintaining the current proportions. This is invaluable for designers, video editors, and photographers who need to scale content without distortion. Common preset buttons for popular ratios like 16:9, 4:3, and 1:1 make it quick to set standard formats.
A live visual preview shows the proportional shape of your entered dimensions, and a common resolutions panel suggests standard resolution options that match your selected ratio. Results update instantly as you type.
Key Features
- Instant aspect ratio calculation in simplified format (e.g., 16:9)
- Decimal ratio display for precise proportional comparison
- Lock ratio mode to resize dimensions while maintaining exact proportions
- Common preset buttons: 16:9, 4:3, 1:1, 21:9, 9:16, and 3:2
- Live visual preview showing proportional shape representation
- Total pixel count and megapixel calculations
- Common resolution suggestions based on the current aspect ratio
- Automatic GCD calculation for simplified ratio output
- Responsive design that works on desktop, tablet, and mobile devices
- Dark mode support for comfortable viewing in any lighting
How to Use the Aspect Ratio Calculator
- Enter width and height: Type your desired width and height in pixels into the input fields.
- View the results: The simplified aspect ratio, decimal ratio, total pixels, and megapixels update instantly.
- Use presets: Click a common preset button (16:9, 4:3, etc.) to automatically adjust your dimensions to that ratio.
- Lock the ratio: Click "Lock Ratio" to maintain the current proportions. Changing width or height will automatically adjust the other value.
- Check the preview: View the proportional preview box on the right to visualize the shape of your dimensions.
- Explore resolutions: Review the suggested common resolutions that match your current aspect ratio.
Use Cases
- Video production: Ensure your video dimensions match platform requirements like 16:9 for YouTube or 9:16 for TikTok and Instagram Stories.
- Web design: Calculate image dimensions that maintain proper aspect ratios across responsive layouts and different screen sizes.
- Photography: Determine crop dimensions for prints, social media posts, and portfolio displays without distorting your images.
- Screen & display selection: Compare aspect ratios when shopping for monitors, TVs, or projectors to find the right fit.
- Graphic design: Set up canvas dimensions for banners, advertisements, and marketing materials with the correct proportions.
- Gaming: Verify screen resolutions and aspect ratios for optimal display settings in games and streaming.
- Presentation design: Choose the right slide dimensions for 4:3 standard or 16:9 widescreen presentations.
- Social media content: Size images and videos correctly for Facebook, Instagram, Twitter, LinkedIn, and other platforms.
Frequently Asked Questions
What is the most common aspect ratio for video?
16:9 is the most widely used aspect ratio for HD video, used by YouTube, most streaming platforms, and modern television displays. For vertical mobile video, 9:16 is the standard.
What does "Lock Ratio" do?
When Lock Ratio is enabled, changing the width automatically adjusts the height (and vice versa) to maintain the current proportional relationship. This prevents distortion when scaling.
How is the simplified ratio calculated?
The tool divides both the width and height by their Greatest Common Divisor (GCD) to produce the simplest whole-number ratio. For example, 1920 x 1080 simplifies to 16:9.
What is the difference between aspect ratio and resolution?
Aspect ratio describes the proportional relationship between width and height (e.g., 16:9), while resolution specifies the exact pixel dimensions (e.g., 1920 x 1080). Multiple resolutions can share the same aspect ratio.
Tips & Best Practices
- Use presets for standard formats: Click a preset button to quickly set dimensions for common formats rather than calculating manually.
- Lock before resizing: Enable Lock Ratio before changing dimensions to avoid accidentally distorting your aspect ratio.
- Check platform requirements: Different social media and video platforms have specific aspect ratio recommendations, so verify before exporting.
- Use the preview: The visual preview helps you quickly understand the shape of the dimensions you have entered.
- Compare megapixels: The megapixel count helps you understand the total image resolution and is useful for comparing camera and display quality.
- Bookmark for regular use: If you frequently work with images or video, save this tool for quick access to aspect ratio calculations.