Liters Per Minute Calculator

What Is a Liters Per Minute Calculator?

A liters per minute (LPM) calculator finds liquid flow rate in pipes and fixtures. Calculate LPM from collected volume and elapsed time, or from pipe cross-sectional area and flow velocity. Results convert to GPM, CFM, and m³/h.

How to Calculate Liters Per Minute

From volume and time:

$$\text{LPM} = \frac{\text{volume (liters)}}{\text{time (minutes)}}$$

From pipe area and velocity:

$$\text{volumetric flow rate} = \text{area} \times \text{velocity}$$

For circular pipes, area equals $\pi d^2 / 4$ where $d$ is internal diameter. See also the Gallons Per Minute Calculator and Pipe Flow Calculator.

Frequently Asked Questions

How do I convert liters per minute to GPM?

Divide LPM by 3.785 to get gallons per minute. For example, 37.85 LPM equals 10 GPM. Multiply GPM by 3.785 to convert back to LPM.

How do I convert LPM to CFM?

Divide liters per minute by 28.317 to get cubic feet per minute. Multiply CFM by 28.317 to convert back to LPM.

How much water flows through a 6-inch pipe?

Flow depends on velocity. A 6-inch pipe at 20 in/s moves about 556 LPM. Enter diameter and velocity in the calculator for your exact result.

What is the difference between LPM and SLPM?

LPM measures liquid flow rate in liters per minute. SLPM (standard liters per minute) measures gas flow at standard temperature and pressure. They are not interchangeable.

How do I measure flow rate from a tap?

Collect water in a container of known volume, time how long it takes, then divide liters by minutes. A 10-liter bucket filled in 30 seconds equals 20 LPM.

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Liters Per Minute Calculator

What Is a Liters Per Minute Calculator?

How to Calculate Liters Per Minute

Frequently Asked Questions

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