Aspect Ratio Calculator
Enter width and height to find the aspect ratio, or scale to new dimensions while keeping proportions. Common presets for screens and social media.
Dimensions
Aspect Ratio
Ratio
16:9
Decimal
1.7778
Pixels
1920 × 1080
Scale to New Size
Height → — px
Width → — px
Common Resolutions
CSS Aspect Ratio
aspect-ratio: 16 / 9; /* or */ aspect-ratio: 1.7778;
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Everything you need to know
Instant Ratio Calculation
Enter any width and height and the tool instantly calculates the simplified aspect ratio, decimal value, and total pixels. The visual preview box scales to show the proportions.
Common Ratio Presets
Quick-select 16:9 (widescreen), 4:3 (standard), 1:1 (square), 21:9 (ultrawide), 3:2 (photo), 9:16 (mobile), and more. One click sets the dimensions.
Scale to New Dimensions
Enter a new width and the tool calculates the matching height — or enter a height and get the width. Perfect for resizing images, videos, or design frames while maintaining proportions.
Resolution Presets
Jump to common resolutions: HD (1280×720), Full HD (1920×1080), 4K (3840×2160), plus social media sizes for Instagram, Twitter, YouTube, and Open Graph images.
CSS Aspect-Ratio Output
Copy the generated aspect-ratio CSS property to use in responsive layouts. The tool provides both the fractional and decimal syntax for maximum flexibility.
Related Tools
Resize images to exact dimensions with the Image Resizer, generate favicons at standard sizes with the Favicon Generator, or explore unit conversions for design measurements.