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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.
There are 1000 ml in a litre. This is because milli in the SI system means a thousandth (1/1000) or 0.001 (of a litre). To convert from litres to ml, multiply by 1000.