The formula to calculate the total in-place volume is:

\[ V = V_s + V_o \]

Where:

• \(V\) is the total in-place volume in cubic meters (m³).
• \(V_s\) is the volume of solid particles in cubic meters (m³).
• \(V_o\) is the volume of voids, either air or water, in cubic meters (m³).