Aspect-ratio calculator
Work out the simplified aspect ratio (like 16:9 or 4:3) from any width and height — useful for identifying a standard ratio or checking a crop.
Result
Simplified ratio
How to use this calculator
- Enter a width and height, in any consistent unit (pixels, cm, inches).
- Read the simplified ratio.
Assumptions
- Rounds width and height to whole numbers before simplifying — very precise non-integer dimensions may not simplify to a perfectly clean ratio.
Technical details: what the fields mean
- Width
width - The width measurement, in any unit — pixels, cm or inches all work as long as width and height use the same unit.
- Height
height - The height measurement, in the same unit as width.
Methodology
Divides both width and height by their greatest common divisor (GCD), giving the simplest whole-number ratio.
Worked example
1920×1080
Inputs: width=1920, height=1080
Result: 16:9
Practical guidance
- Common standard ratios: 16:9 (widescreen video), 4:3 (older TV/photo), 3:2 (35mm photo), 1:1 (square).
Common mistakes
- Assuming any width/height combination will simplify to a 'clean-looking' standard ratio — many real images and crops don't match a standard ratio exactly.
FAQs
What aspect ratio is 1920x1080?
16:9 — the standard widescreen video ratio.