Water to Cement Ratio

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Water-cement ratio is the ratio of weight of water to the weight of cement used in a concrete mix and can be expressed as

r = w_h20 / w_c

  = 8.33 q_H20 / w_c    (1)

where 

r = water to cement ratio

w_h20 = weight of water (lbs)

w_c = weight of cement (lbs)

q_H20 = volume of water (US gallon)

Example - Water to Cement Ratio

A batch of 2 cubic yard - ya - concrete has 45 gallons of water and 900 lbs of cement. The water to cement ratio can be calculated as

r = 8.33 (45 gallons) / (900 lbs)

  = 0.42 

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