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A unit of blood is equivalent to approximately 1 pint or 450 milliliters, according to the Canadian Blood Services website. The average patient requires around 4.6 units of blood.
For blood, which is mostly water, 450ml = 450 grams. Essentially the same weight. A unit of packed red blood cells weighs an average of 275mls. Or 275 grams. These measures are used to record input and output volumes on patients. Some blood banks have a standard packaging weight that is subtracted from the liquid weight. But we still expres milliliters and grams as being equal for blood. We weigh the blood bags on a scale that records grams, which we then express as milliliters. I hope this is answers your question.