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If you refer the PointCloud2 data structure, you can see that the width (in case of an unstructured point cloud) gives the length of the point cloud. In other words, height * size gives you the size of the point cloud (number of points in the complete scan).

I wanna measure the width of a box from the laser data

What box? It would be helpful if you post a sample of your data and/or maybe images that depict what you are trying to convey. It is unclear what size you are trying to calculate