Question 1

How do you simplify a ratio?

Accepted Answer

Both numbers are divided by their greatest common divisor. For example 1920×1080 divides by 120 to become 16:9.

Question 2

What are the most common ratios?

Accepted Answer

16:9 for video and most screens, 4:3 for older displays, 1:1 for social profile images, 9:16 for vertical video, and 3:2 for many photos.

Question 3

How do I keep an image from stretching?

Accepted Answer

Resize it proportionally by scaling both sides by the same factor. The missing-side calculator below does exactly that.

Question 4

Is anything uploaded?

Accepted Answer

No. All calculations run locally in your browser.

Aspect Ratio Calculator

Find a missing side