ClarityHow to use this tool
- Enter original width (pixels), original height (pixels), new width (pixels).
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
Input reference and sample values
Use the units and choices shown for each field. Sample values are provided for practice, not as recommendations.
| Input | Format and units | Sample |
|---|---|---|
| Original width (pixels) | Numeric value. Minimum: 1. Maximum: 1000000. | 1920 |
| Original height (pixels) | Numeric value. Minimum: 1. Maximum: 1000000. | 1080 |
| New width (pixels) | Numeric value. Minimum: 1. Maximum: 1000000. | 1280 |
Result for these sample inputs
16:9
- Height at target width
- 720
- Nearest whole-pixel height
- 720
- Scale factor
- 0.666666667
Select Try the example in the form to load these values and calculate them again. This replaces the current form inputs. Compare the result with the method and worked explanation below.
The method, explained
Divide width and height by their greatest common divisor. Matching height = new width × original height ÷ original width.
1920 × 1080 simplifies to 16:9. Resizing to 1280 pixels wide gives a height of 720 pixels.
What to keep in mind
Whole-pixel inputs only. The exact scaled height can be fractional; the nearest-pixel result may differ slightly from the original ratio. This tool calculates dimensions but does not resize an image file.
Common questions
Does the ratio change between landscape and portrait?
Yes. Width comes first; 16:9 landscape becomes 9:16 when rotated.
Will this crop an image?
No. It calculates proportional dimensions with no cropping or file upload.
Methodology maintained by ClarityKit. How these tools are built and checked.