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4:5 Aspect Ratio Calculator
Work with the 4:5 aspect ratio: enter one dimension and get the other keeping 4:5, or check whether a size matches 4:5. For example 1920 × 2400 is a 4:5 size (4:5 means 4 units wide for every 5 tall). The calculator reduces any width×height to its simplest ratio with the greatest common divisor and solves the missing dimension so images and video keep 4:5 without distortion — all in your browser. Common for Instagram portrait posts.
4:5 means 4 wide for every 5 tall
- Example 4:5 size: 1920 × 2400
- Reduced via gcd; resize keeps the ratio (no distortion)
Frequently asked questions
What dimensions are 4:5?
Any width×height that reduces to 4:5. For example 1920 × 2400 is 4:5. Enter one dimension in the calculator and it returns the other keeping 4:5.
How do I resize to 4:5?
Set the ratio to 4:5, type your new width (or height), and the calculator computes the matching height (or width) so the image keeps 4:5 without stretching.