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The total amount of soluble constituents from the malt is usually reported as a percent on the basis of weight. Extract can be expressed on a weight to volume basis using the following formula kg extract/hl = (°P) ´ (SG). For example, 1.2 hectoliters of wort at 13 °P with a SG of 1.050 has 13.65 kg of extract/hl or 16.38 of extract for 1.2 hectoliters. If 22 kilograms of grain is used the yield is (16.38 ´ 100)/22 = 74.5%.