Measure a tap's flow rate using the bucket-fill method — enter a container's volume and how long it takes to fill.
How to Use the Tap Flow Calculator
Time how long it takes to fill a container of known volume at full tap flow.
Enter the "Container Volume (Litres)" and "Time to Fill (seconds)".
Click "Calculate" to see the tap flow rate in L/min and US GPM.
Frequently Asked Questions
Time how long it takes to fill a container of known volume (e.g. a 10-litre bucket) at full flow, then Flow Rate = Volume ÷ Time × 60, converting to litres per minute (LPM).
Most household taps flow at roughly 6-15 LPM, though this varies with your water pressure, tap type, and any flow restrictors/aerators fitted.
It helps diagnose low-pressure complaints, check if a tap meets a fixture's rated flow requirement, or estimate water usage/cost for a task like filling a tank.
Yes, it's completely free and requires no sign-up.