LPS to GPM Calculator

Liters Per Second to Gallons Per Minute

LPS to GPM converts liters per second into gallons per minute. LPS is common in metric water, fire, irrigation, pump, plumbing, and hydraulic specifications, while GPM is common in United States pump curves, plumbing fixture data, irrigation zones, fire-flow documents, and hydraulic power-unit work.

Key Engineering Entities

Important entities include LPS, GPM, US gallon, Imperial gallon, NIST, ISO, Hydraulic Institute, NFPA, AWWA, centrifugal pumps, irrigation systems, plumbing systems, hydraulic systems, flow meters, and pump curves.

Convert High Metric Flow to US GPM

The LPS to GPM calculator above requests a liters-per-second value and returns US gallons per minute. It is designed for fast comparison between metric flow readings and US pump, irrigation, plumbing, fire-water, and industrial water specifications.

Default example: 1 LPS = 15.850 GPM.

Direct Volumetric Flow Conversion

To convert LPS to GPM, multiply liters per second by 15.8503231 for US gallons per minute. This factor combines 60 seconds per minute with the NIST US liquid gallon volume of 3.785411784 liters.

For Imperial gallons per minute, use a different factor because the Imperial gallon is larger than the US gallon.

Metric High Flow to US Customary Flow

Liters per second to gallons per minute is a high-flow conversion often used when metric pump data, water-main flow, fire-water demand, or industrial transfer flow needs to be compared with US GPM equipment data.

LPS often appears in ISO, EN, municipal, irrigation, and process systems. GPM appears in US pump curves, NFPA fire-flow documents, AWWA water data, and plumbing equipment schedules.

Worked Calculation

For 2 LPS, calculate US GPM as 2 x 15.8503231 = 31.701 GPM. This is useful for comparing a metric flow meter or pump curve with US equipment data.

2 LPS = 31.701 US GPM.

US and Imperial Values

1 LPS = 15.8503231 US GPM. If the document uses Imperial gallons, 1 LPS = 13.1981549 Imperial GPM. Confirm the gallon standard before applying the value to pump sizing, irrigation, plumbing, or hydraulic systems.

Formula Derivation

One liter per second equals 60 liters per minute. Divide 60 by 3.785411784 liters per US gallon to get 15.8503231 US gallons per minute.

High-Flow Reference Chart

The chart below uses US GPM = LPS x 15.8503231. It supports water flow, pumps, irrigation mains, plumbing systems, fire-water systems, and hydraulic transfer applications.

Example for a Pump Duty Point

A metric pump duty point shows 6 LPS. Convert to US GPM by multiplying 6 by 15.8503231. The result is 95.102 GPM, which can be compared with US pump curves and valve schedules.

6 LPS = 95.102 US GPM.

US Liquid Gallon Basis

LPS to US GPM uses the US liquid gallon, defined by NIST as 3.785411784 liters. Use this for US pump data, plumbing fixtures, pressure washers, irrigation equipment, NFPA fire-flow references, and AWWA water-system documentation.

Imperial Gallon Basis

LPS to Imperial GPM uses the Imperial gallon, equal to 4.54609 liters. The conversion factor is 13.1981549. Imperial GPM appears in older UK, Commonwealth, and some legacy pump and water-system documents.

LPS to GPM for water flow is used in municipal water, fire water, booster stations, process water, cooling water, filtration, and transfer systems. Common entities include AWWA, NFPA, flow meters, SCADA, PLCs, magnetic meters, and ultrasonic meters.

LPS to GPM for pumps helps compare metric duty points with US pump curves. Entities include centrifugal pumps, booster pumps, fire pumps, submersible pumps, Hydraulic Institute standards, ISO 9906, NPSH, total dynamic head, Grundfos, Xylem, KSB, Wilo, and Goulds.

LPS to GPM for irrigation converts metric zone or mainline flow into US GPM for sprinkler, drip, valve, filter, and pump comparisons. Entities include Rain Bird, Hunter, Toro, Netafim, sprinkler zones, drip emitters, pressure regulators, and pump stations.

LPS to GPM for plumbing is useful when fixture flow, booster pump capacity, water-service flow, or test data is metric but US plumbing documentation uses GPM. Entities include IPC, UPC, WaterSense, fixture units, valves, pressure regulators, and domestic water boosters.

LPS to GPM for hydraulic systems supports hydraulic power units, oil transfer, cooling loops, and industrial fluid power documentation. Entities include Parker, Eaton, Bosch Rexroth, Danfoss, hydraulic pumps, control valves, cylinders, oil viscosity, and system pressure.

Flow rate conversion keeps LPS, GPM, LPM, m³/h, L/s, and CFM consistent across pumps, pipe systems, irrigation, plumbing, fire water, and hydraulic systems. Always verify the gallon standard before using GPM values in engineering work.