Faucet Flow Rate Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: July 27, 2026Faucet Flow Rate Calculator
Test your actual faucet flow rate at home with just a container and a stopwatch - this calculator converts your fill test into gallons per minute (GPM).
Flow Rate (GPM) = (Container Volume(gal) / Fill Time(sec)) x 60
Example
Filling a 1-gallon container in 30 seconds:
Flow Rate = (1/30) x 60 = 2.00 GPM
What a Typical Flow Rate Should Look Like
Standard bathroom faucets are commonly rated around 1.5-2.2 GPM under current federal efficiency standards, while kitchen faucets often run slightly higher at 1.8-2.2 GPM to allow faster filling of pots and larger containers.
A Low Result Often Points to a Simple Fix
A measured flow rate noticeably below these typical ranges is frequently caused by mineral buildup clogging the small mesh screen inside the faucet's aerator - unscrewing and cleaning or replacing the aerator is a common, inexpensive fix worth trying before assuming a larger plumbing issue.