# How To Calculate Zoom

Zoom represents the extent to which a photo or video can be expanded while maintaining its clarity. This is determined by dividing the dimensions of the original photo or video by the dimensions of the playback device’s screen. In this article, we will guide you through the process of calculating zoom for both photos and videos.

## Calculating Zoom for Images

To calculate zoom for an image, you need to know the dimensions of the original image and the dimensions of the display device. Here are the steps to follow:

1. Measure the width and height of the original image in pixels.
2. Measure the width and height of the display device in pixels.
3. Divide the width of the original image by the width of the display device to get the horizontal zoom ratio.
4. Divide the height of the original image by the height of the display device to get the vertical zoom ratio.
5. Multiply the horizontal and vertical zoom ratios together to get the overall zoom ratio.

## Calculating Zoom for Videos

To calculate zoom for a video, you need to know the dimensions of the original video and the dimensions of the display device. Here are the steps to follow:

1. Measure the width and height of the original video in pixels.
2. Measure the width and height of the display device in pixels.
3. Divide the width of the original video by the width of the display device to get the horizontal zoom ratio.
4. Divide the height of the original video by the height of the display device to get the vertical zoom ratio.
5. Multiply the horizontal and vertical zoom ratios together to get the overall zoom ratio.

## Conclusion

In conclusion, calculating zoom for both images and videos is a simple process that involves dividing the dimensions of the original content by the dimensions of the display device. By following these steps, you can accurately determine the zoom ratio for any image or video.