Aspect Ratio Calculator — Ratio, Scale, Print & Compare Free
Calculate ratios, missing dimensions, scale sizes, print dimensions & compare resolutions
Five calculators in one: find the aspect ratio from any width and height, calculate a missing dimension from a known ratio, scale sizes up or down, convert pixel dimensions to print sizes in inches and centimeters, and compare two resolutions side by side. 12 social media presets included — no file upload needed.
Enter Width × Height
QUICK PRESETS
COMMON RATIOS
What is Aspect Ratio?
Aspect ratio is the proportional relationship between a video or image's width and height. Expressed as W:H, it determines how the content appears on screen. 16:9 is the standard for HD video, while 1:1 is square for social media.
Frequently Asked Questions
What aspect ratio is 1920×1080?
1920×1080 is a 16:9 aspect ratio, the standard widescreen ratio used by HD video, YouTube, and most modern monitors.
How do I find height from width and ratio?
Use the Missing Dimension tab. Select your ratio (e.g. 16:9), choose "I know the Width", enter your width, and the calculator instantly shows the correct height.
How do I convert pixels to inches for printing?
Use the Print Size tab. Enter your pixel dimensions and the table shows the print size in both inches and centimeters at 72, 96, 150, 300, and 600 DPI.
What is the difference between 16:9 and 4:3?
16:9 is a wider widescreen ratio (1.78:1) used in HD TV and video. 4:3 (1.33:1) is a more square ratio from traditional TV and older monitors.
How do I scale a 1080p video to 720p?
Use the Scale Calculator tab. Enter 1920×1080 as your base size. The table shows 720p (1280×720) at the 66.7% scale, maintaining the same 16:9 ratio.