When you're previewing the grain size chart chart (Window > Chart), selecting Curve > Calculator opens a dialog where you can check the percent of material smaller than a given particle size, or determine the particle size that corresponds to a particular percentage.
- To calculate the percent of material smaller than a particular particle size, enter the size into the dialog's Particle size box. If you're working with a project using US dimensions add
mm.at the end of the particle size if you're entering a size in millimeters. Conversely, if you're working with an SI-dimensioned project, addin.to enter a size in inches. Numbered sieves need to have#at the front; e.g.,#200. - To calculate the particle size corresponding to a particular percentage, enter the percentage into the Percent smaller or Percent larger box.