CSS Aspect Ratio Calculator
Calculate aspect ratios and generate CSS code for responsive web design
Calculate CSS Aspect Ratio
Original Dimensions
Target Dimensions
Aspect Ratio Results
16:9
Ratio
1.7778
Decimal
56.25%
Padding-bottom
Target Dimensions
Width: 800px × Height: 450px
Closest Common Ratio
16:9 - Widescreen (16:9)
Video, modern displays
Generated CSS Code
/* Method 1: Using aspect-ratio property (modern browsers) */
.aspect-ratio-container {
width: 800px;
aspect-ratio: 16/9;
}
/* Method 2: Using padding-bottom technique (legacy support) */
.aspect-ratio-container {
position: relative;
width: 800px;
height: 0;
padding-bottom: 56.2500%;
}
.aspect-ratio-content {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
/* Method 3: Fixed dimensions */
.fixed-aspect-ratio {
width: 800px;
height: 450px;
}Visual Preview
Original Ratio
16:9
Target Size Preview
800 × 450
Scaled to fit preview
CSS Implementation Methods
Modern: aspect-ratio
CSS property for modern browsers
aspect-ratio: 16/9;Legacy: padding-bottom
Percentage-based technique
padding-bottom: 56.25%;Fixed: width & height
Explicit dimensions
width: 800px; height: 450px;Common Aspect Ratios
16:9
Video, modern displays
1.778
16:10
Laptop displays
1.600
4:3
Classic monitors, tablets
1.333
3:2
Digital cameras, prints
1.500
1:1
Social media, profiles
1.000
21:9
Cinematic, ultrawide monitors
2.333
2:1
Website banners, covers
2.000
5:4
Traditional portraits
1.250
Understanding CSS Aspect Ratios
What is CSS Aspect Ratio?
CSS aspect ratio is the proportional relationship between the width and height of an element. It's crucial for responsive design, ensuring elements maintain their intended proportions across different screen sizes and devices.
Why Use Aspect Ratios?
- •Maintain consistent visual proportions
- •Prevent layout shifts during loading
- •Create responsive media containers
- •Ensure consistent UI across devices
Implementation Methods
Modern CSS (aspect-ratio)
.container {
aspect-ratio: 16/9;
width: 100%;
}Legacy Support (padding-bottom)
.container {
position: relative;
width: 100%;
padding-bottom: 56.25%;
}