About this tool: Aspect Ratio Calculator
Reduce width and height to a ratio and calculate a proportional new dimension.
Enter the original width and height as positive integers, then choose which new dimension you know. The ratio is reduced using the greatest common divisor. The result includes the proportional dimension and its nearest whole-number value; this is sizing arithmetic rather than image resampling.
How the calculation works
Worked example
| Width | 1920 |
| Height | 1080 |
| Mode | Width |
| New size | 1280 |
1920:1080 = 16:9; 1280 × 720
Questions and answers
What does this tool do?
Reduce width and height to a ratio and calculate a proportional new dimension. Enter the original width and height as positive integers, then choose which new dimension you know. The ratio is reduced using the greatest common divisor. The result includes the proportional dimension and its nearest whole-number value; this is sizing arithmetic rather than image resampling.
What affects precision and input format?
Floating-point results are rounded for display. Keep the units shown in the input labels; decimal points and decimal commas are accepted.
Where are the calculations performed?
The calculation runs in your browser. You can use the tool without installing software.
Asted Cloud
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