Concrete Mix

The Concrete Mix calculator computes volume and weight of cement, sand, gravel and water requires to make a volume of concrete.

INSTRUCTIONS: Choose units and enter the following:

• (V) Volume of Concrete

Concrete Mix (CMX): The calculator returns the following:

• (vCM) Volume of Cement in cubic yards (yd³)
• (wtCM) Weight of Dry Cement in pounds (lb)
• (vSD) Volume of Sand in cubic yards (yd³)
• (wtSD) Weight of Dry Sand in pounds (lb)
• (vGV) Volume of Gravel in cubic yards (yd³)
• (wtGV) Weight of Dry Gravel in pounds or tons (lb or ton US)
• (vWT) Volume of Water in gallon (gal)
• (wtSD) Weight of Water in pounds or tons (lb or ton US)

Note: Units can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The Concrete Mix equation computes the volume of cement, gravel and sand to make concrete mix based on the ratio:

• 4 parts gravel
• 2 parts sand
• 1 part cement

It uses these ratios to compute individual volumes.  It then applies the mean density of dry grave, sand and cement to compute the matching weight.

Lastly, i uses 39.375 gallons of water per cubic yard of concrete to compute the volume of water, and then 998.2 kg/m³ density of water to compute the weight of water.