The formulas to calculate the volumes are:

\[ Vc = 7.84 \cdot Vco \]

\[ Vs = 0.44 \cdot Vco \]

\[ Vg = 0.88 \cdot Vco \]

Where:

• \(Vc\) is the volume of cement (bags).
• \(Vs\) is the volume of sand (m³).
• \(Vg\) is the volume of gravel (m³).
• \(Vco\) is the volume of concrete (m³).