What is the average flow rate of a bathtub faucet?

The average flow rate of a bathtub faucet typically ranges from 4 to 8 gallons per minute (GPM). This can vary depending on the faucet design and water pressure. Modern faucets may have flow restrictors to conserve water, which can lower the flow rate to about 2.5 GPM. Always check the manufacturer's specifications for the most accurate information.