Aspect Ratio Calculator
A free online aspect ratio calculator. Enter width and height to get the simplified ratio, or enter a ratio and one dimension to calculate the other. Supports common ratios like 16:9, 4:3, 21:9, 1:1. Essential for video production, responsive image sizing, CSS padding-top hacks, and maintaining proportions across different screen sizes.
Enter Dimensions
Common Presets
Results
Aspect Ratio
16:9
Decimal
1.7778
Visual Preview
1920 × 1080
Related Design Tools
CLIcCp
Browse all Design tools →Color Converter (HEX / RGB / HSL)
Convert colors between HEX, RGB, HSL, and CMYK formats.
Image Compressor
Compress images in your browser — JPEG, WebP, PNG. No uploads.
Color Palette Generator
Generate complementary, analogous and triadic palettes from any colour.