Aspect Ratio Calculator
Calculate aspect ratio from WxH.
Input
Result
What is a Aspect Ratio Calculator?
The Aspect Ratio Calculator helps you calculate the aspect ratio between width and height for images, videos, and screens. Just enter your numbers and the tool does the rest — no manual math, no guesswork.
How to calculate Aspect Ratio manually (the formula)
The specific formula depends on what you are calculating. The calculator applies the correct equation automatically, but understanding the formula helps you verify the results and adapt them to your own needs.
Example calculation
Enter your values into the calculator and it will produce an instant result. For a step-by-step walkthrough, try different inputs and observe how each one affects the outcome.
Common mistakes
- Stretching instead of cropping — Forcing content into a different aspect ratio distorts the image. Crop or add padding instead.
- Confusing orientation — 16:9 is landscape; 9:16 is portrait. Flipping them gives the wrong result.
- Using pixel values without simplifying — Reduce W:H to the smallest whole numbers. 2560:1440 simplifies to 16:9.
Frequently asked questions
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height, expressed as W:H (e.g., 16:9).
How do I calculate aspect ratio?
Divide both width and height by their greatest common factor. For 1920×1080, divide both by 120 to get 16:9.
What are common aspect ratios?
16:9 (HD video), 4:3 (older screens), 21:9 (ultrawide), 1:1 (square photos), 9:16 (vertical video).
How do I find the width from height and aspect ratio?
Width = Height × (W / H). For 16:9 at 720 px tall: 720 × (16/9) = 1280 px wide.
What’s the difference between 16:9 and 4:3?
16:9 is wider, giving a cinematic look. 4:3 is squarer, closer to a standard photo ratio.
How do I maintain aspect ratio when resizing?
Always scale both dimensions by the same factor. Divide the target width by the original width to find the scale.