RATIOKIT • FAST • SIMPLE
Aspect Ratio Calculator
Calculate. Resize. Crop. Done. Fast browser-based tools for images, video and dimensions.
Calculate aspect ratio
Enter width and height.
Quick presets
Common dimensions.
IMAGE TOOL
Image ratio finder
Drop an image to inspect its dimensions and aspect ratio. Processing stays in your browser.
RESIZE
Resize without changing aspect ratio
Enter the original dimensions and a target width or height.
CROP
Aspect ratio crop calculator
Find the largest crop that fits your target ratio without stretching the image.
SOCIAL • VIDEO • DISPLAY
Popular sizes
Click a preset to load it into the main calculator.
ABOUT ASPECT RATIOS
What is an aspect ratio?
An aspect ratio describes the proportional relationship between width and height. For example, 1920 × 1080 has a 16:9 aspect ratio.
RatioKit performs calculations directly in your browser. Image dimensions are read locally and the selected image is not uploaded by this tool.
Common questions
What is 1920 × 1080?
It is a 16:9 aspect ratio, widely used for HD video, YouTube and modern displays.
What is 1080 × 1920?
It is a 9:16 aspect ratio, commonly used for vertical video such as Shorts, Reels and TikTok.
How do I resize without distortion?
Keep the original width-to-height ratio. Enter the original dimensions and one target dimension in the resize tool.
How do I crop to 16:9?
Enter the image dimensions and set the target ratio to 16 and 9. The crop calculator returns the largest matching rectangle.