Aspect ratio calculator
Finds the aspect ratio of images, videos and screens and calculates the matching height or width when you resize.
What you enter is processed in this browser only and is not transmitted.
Loading tool …
How it works
- Enter the original width and height.
- Optionally enter a new width or height.
- Click “Calculate” – the ratio, decimal value and new size are shown.
Notes and limitations
- The ratio is reduced with the greatest common divisor: 1920 × 1080 → 16:9.
- The new dimension is calculated as new width × height ÷ width (or the other way round).
- Some common screen sizes are not exact ratios (e.g. 1366 × 768 is roughly 16:9 but reduces to 683:384).
Frequently asked questions
Is 1366 × 768 really 16:9?
Approximately. Exactly it is 683:384 (≈ 1.779:1), while 16:9 is 1.778:1.