Construction

Instant, private, and free

Liters per Minute Calculator.

Calculate flow rate from liters and elapsed minutes.

On-device calculationNo signup
01

Set your values

Results update as you type.

liters: 100

liters

0.0000
minutes: 5

minutes

0.0000
Liters/minute: 20

Liters/minute

0.0000
Gallons/minute: 5.2834

Gallons/minute

0.0000

Planning arithmetic only; enter explicit dimensions, areas, and elapsed times. No code, product, density, or design recommendation is inferred.

Use Cases

Pump flow rate testing

Measure how many liters a pump delivers in a set time to verify its output against specifications.

Example: If a pump delivers 30 liters in 2 minutes, the flow rate is 15 L/min.

Filling or emptying tanks

Determine how quickly a tank fills or empties by timing the volume change.

Example: A tank gains 50 liters in 5 minutes, so the fill rate is 10 L/min.

Frequently Asked Questions

How do I calculate liters per minute?
Enter the total liters and the elapsed time in minutes. The calculator divides liters by minutes to give you the flow rate in L/min.
What units does this calculator use?
It uses liters (L) for volume and minutes (min) for time. The result is in liters per minute (L/min).
Can I use this for water flow in pipes?
Yes, you can use it to estimate flow rate from a known volume and time, which is useful for checking pump output or pipe flow.

Tips & Common Mistakes

Tips

  • Ensure the time is in minutes; if you have seconds, convert to minutes first (divide by 60).
  • Use consistent units: liters for volume, minutes for time.
  • For accurate results, measure the volume precisely and time the duration carefully.
  • This calculator gives an average flow rate over the elapsed time.

Common Mistakes to Avoid

  • Forgetting to convert seconds to minutes before entering time.
  • Using gallons or other volume units instead of liters.
  • Entering time in hours instead of minutes, leading to incorrect flow rates.

Last updated: August 13, 2026