A kitchen faucet is provided that automatically fills a vessel up to a user-specified level without regard to a specific volume. The faucet illustratively includes a faucet body and a spray head that can be detached from the faucet body, such as a pull-down or pull-out faucet. The faucet illustratively includes a user interface for setting the level at which to fill the vessel (e.g., 20%, 40%, 75%, etc.). The spray head illustratively includes sensor(s) to determine a water level in the vessel in relation to its top edge. This allows a vessel to be filled to a user-specified level regardless of the vessel shape or size.