Gallons Per Minute Calculator

Find flow rate from a volume and time.

Volume

Time to fill

Flow rate (GPM) 50

Flow rate (L/min) 189.27

Formula: GPM = gallons ÷ (seconds ÷ 60)

Step-by-step with your numbers:

1. Values used:

2. Volume = 50

3. Time to fill = 60

5. Flow rate = 50GPM

6. Flow rate = 189.27L/min

Did we solve your problem today?

Measure water flow by timing how long a known volume takes to fill.

The math behind it

GPM = gallons ÷ minutes. Time filling a known container, then divide.

50 gal in 60 s → 50 GPM.

Quick home test?

Time filling a 5-gallon bucket: GPM = 300 ÷ seconds.