There is no set standard bathroom sink bowl size. However, when you buy a sink for a countertop, you will find most fall within a certain size range. This range is between 15 and 18 inches wide overall. This width varies due to the shape of the bowl as well.
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Standard bathroom sink dimensions don't exactly exist, but there are a few common sizes that seem to stand the test of time. Generally, rectangular bathroom sinks will run anywhere from 19 to 24 inches wide (side to side) and 16 to 23 inches in length (front to back). Circular bathroom sinks typically range from 15 to 20 inches in diameter.