Image Aspect Ratio Calculator
Reports the simplified ratio, the nearest common format, and the exact second dimension required to reach a chosen ratio without cropping.
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Nothing you enter here is sent anywhere. There is no file and no request to our server - the work is done in your browser and disappears when you close the page.
How It Works
- Enter — Fill in the values the tool asks for.
- Run — Press the button; an empty field is reported by name rather than read as zero.
- Read — The answer comes with the working behind it, so you can check the figure.
- Take it — Copy the result, or download it where the tool offers that.
Frequently Asked Questions
What does a raw image file say about DPI?
Usually nothing you can rely on. DPI is metadata a camera or editor writes, and most screen-captured files default to 72. This calculator derives the density from the pixel size and the physical size you actually want.
How are aspect ratios simplified?
The pixel dimensions are reduced by their greatest common divisor, then also matched to the nearest common ratio (16:9, 3:2, 4:3 and so on) because a rounded sensor ratio rarely divides exactly.