Aspect Ratio Calculator
Calculate aspect ratio from width and height, simplify to common formats
Input
Aspect Ratio
16:9
Simplified Ratio
1920 × 1080
Greatest Common Divisor
120
Formula
Aspect Ratio = Width ÷ Height, simplified by dividing both by their GCD
FAQ
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height of an image or screen. It's expressed as two numbers separated by a colon, like 16:9.
What are common aspect ratios?
Common ratios: 16:9 (HD video), 4:3 (standard display), 3:2 (photography), 1:1 (square/social media), 21:9 (ultrawide).
How to find the GCD of width and height?
The GCD (Greatest Common Divisor) is the largest integer dividing both width and height. Divide both values by the GCD to get the simplified ratio. For 1920×1080, GCD = 120, giving 16:9.