Flow Rate Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the volume (litres) and the time (minutes).
- Read the flow rate.
How it works
Flow rate = volume ÷ time; the per-hour and per-second figures are scaled from L/min.
Worked example
200 L in 5 minutes. = 40 L/min.
Common mistakes
- Timing only part of the fill — measure a steady, full flow.
- Mixing units — keep volume in litres and time in minutes.
Frequently asked questions
How do I measure flow at a tap?
Time how long a bucket of known volume takes to fill, then enter both — e.g. a 10 L bucket in 30 s is 20 L/min.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.