Aspect Ratio Calculator
Calculate aspect ratios and resize dimensions proportionally.
Ad
Enter Dimensions
×
Ctrl+Enter
Common Presets
Copied!
Resize (ratio locked)
×
Ad
Frequently Asked Questions
What is an aspect ratio? +
An aspect ratio is the proportional relationship between the width and height of an image, screen, or video. It's expressed as two numbers separated by a colon, like 16:9, meaning for every 16 units of width there are 9 units of height.
What is the most common aspect ratio? +
16:9 is the most common aspect ratio for modern displays, TVs, and YouTube videos. Other common ratios include 4:3 (older TVs), 1:1 (Instagram posts), 9:16 (vertical video), and 21:9 (ultrawide monitors).
How do you calculate aspect ratio? +
Divide both the width and height by their greatest common divisor (GCD). For example, 1920x1080: GCD(1920,1080)=120, so 1920/120 : 1080/120 = 16:9.
How do I resize an image while keeping the aspect ratio? +
Change one dimension and calculate the other: new_height = new_width x (original_height / original_width). This calculator does it automatically — just change one dimension and the other updates.
What aspect ratio is 1920x1080? +
1920x1080 has an aspect ratio of 16:9, which is standard Full HD. Common 16:9 resolutions include 1280x720 (HD), 1920x1080 (Full HD), 2560x1440 (QHD), and 3840x2160 (4K UHD).
Ad