Are there standard sizes for bathroom sinks?

Yes, bathroom sinks do come in standard sizes. Standard round and oval sinks typically come in 16-, 17-, 18-, 19- and 20-inch diameters, while standard rectangular sinks measure somewhere between 19 to 24 inches in width by 16 to 23 inches in length. However, not all manufacturers produce sinks in every standard size, and some also offer sinks in sizes that are smaller or larger than standards. On 1stDibs, shop an assortment of sinks.