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Gallon (US)/minute to Liter/minute (gal (US)/min to L/min) Calculator & Formula

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Live Conversion • ISO 80000-4:2019 Certified
1 Gallon (US)/minute = 3.78541178 Liter/minute
1 gal (US)/min = 3.785412 L/min • 1 L/min = 0.264172 gal (US)/min
Gallon (US)/minute to Liter/minute: One Gallon (US)/minute is equal to 3.78541178 Liters/minute.
Certified Authority Value
3.78541178
L/min
Exact: 1 L/min ≡ 0.2641720524 gal (US)/min
gal (US)/min
gal (US)/min
Swap to Liter/minute to Gallon (US)/minute
L/min
L/min 3.78541178
Quick Values:
1 gal (US)/min 5 gal (US)/min 10 gal (US)/min 25 gal (US)/min 50 gal (US)/min 100 gal (US)/min 250 gal (US)/min 500 gal (US)/min 1,000 gal (US)/min
Conversion Formula
To convert Gallon (US)/minute to Liter/minute, multiply by 3.78541178
gal (US)/min × 3.78541178 = L/min

Calculation: 1 gal (US)/min × 3.78541178 = 3.78541178 L/min

Common Gallon (US)/minute to Liter/minute Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Gallon (US)/minute (gal (US)/min) and Liter/minute (L/min).

Tap any row to calculate
Liter/minute to Gallon (US)/minute: Reciprocal Summary
Liter/minute to Gallon (US)/minute Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 L/min is equal to 0.264172 gal (US)/min (Gallon (US)/minute) 2.642 × 10⁻¹
5 L/min is equal to 1.32086 gal (US)/min (Gallon (US)/minute) 1.321 × 10⁰
10 L/min is equal to 2.641721 gal (US)/min (Gallon (US)/minute) 2.642 × 10⁰
50 L/min is equal to 13.208603 gal (US)/min (Gallon (US)/minute) 1.321 × 10¹
100 L/min is equal to 26.417205 gal (US)/min (Gallon (US)/minute) 2.642 × 10¹
View Complete 15-Row Liter/minute to Gallon (US)/minute Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Gallon (US)/minute (gal (US)/min) and Liter/minute (L/min):

Gallon (US)/minute References:

  • EPA WaterSense certified residential bathroom sink faucet flow limit (1.5 gpm) 1.5 gpm
  • Standard residential outdoor garden hose discharge delivery flow rate (5 gpm) 5 gpm
  • Commercial building automatic fire sprinkler head water discharge rate (25 gpm) 25 gpm
  • Fire department commercial attack line firefighting hose water delivery (150 gpm) 150 gpm

Liter/minute References:

  • Standard water-saving residential bathroom showerhead water flow limit 9 L/min
  • Standard domestic kitchen sink faucet aerator maximum flow rate 6 L/min
  • Resting adult human pulmonary ventilation air inhalation flow rate 6 L/min

Tap any benchmark above to automatically calculate its exact equivalent in Liter/minute.

ISQ Dimension: [L³ T⁻¹] Coherent SI Unit: cubic meter per second (m³/s) Fluid Dynamics & Rheology

How to Convert Gallon (US)/minute to Liter/minute

Converting Gallon (US)/minute (gal (US)/min) to Liter/minute (L/min) is a core calculation in Volumetric Flow Rate, which quantifies the volume of fluid passing through a designated conduit cross-section per unit of time. This calculation navigates the boundary between the International Metric System (SI) and British Imperial / US Customary engineering standards. In contemporary metrology, Imperial units are defined in terms of exact SI standards via international agreements—notably NIST SP 811 and the 1959 International Yard and Pound Agreement. Exactly 1 Gallon (US)/minute equals 3.785412 Liter/minute, while 1 L/min equals 0.264172 gal (US)/min.

Direct Factor1 gal (US)/min = 3.785412 L/min
Inverse Ratio1 L/min = 0.264172 gal (US)/min
Conversion ScaleMetric SI to British Imperial / US Customary Bridge
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (cubic meter per second (m³/s)) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 gal (US)/min = 6.30902 × 10⁻⁵ cubic meter per second (m³/s)
2. Target SI Bridge (ktarget):1 L/min = 1.666667 × 10⁻⁵ cubic meter per second (m³/s)
Step-by-step substitution for Gallon (US)/minute → Liter/minute:V(L/min) = V(gal (US)/min) × ( 6.30902 × 10⁻⁵ / 1.666667 × 10⁻⁵ ) = V(gal (US)/min) × 3.785412
Mathematical FormulaValue in Liter/minute = Value in Gallon (US)/minute × 3.78541178Direct computational formula applied for standard conversion.
Worked Example

Converting 250 gal (US)/min yields an exact output of 946.352946 L/min in Liter/minute. Under higher industrial throughput, 240 gal (US)/min translates to 908.498828 L/min.

Inverse check: 1 L/min = 0.264172 gal (US)/min.

Understanding Gallon (US)/minute and Liter/minute

Gallon (US)/minute

gal (US)/min
Imperial / US

A Gallon (US)/minute (gal (US)/min) is an imperial and US customary unit for volumetric flow rate.

Applications & Practical Context

In practical flow terms, a EPA WaterSense certified residential bathroom sink faucet flow limit (1.5 gpm) equals 1.5 gpm, a standard residential outdoor garden hose discharge delivery flow rate (5 gpm) equals 5 gpm, a commercial building automatic fire sprinkler head water discharge rate (25 gpm) equals 25 gpm.

Physical Setup

A physical magnitude of 1 gal (US)/min corresponds to 6.30902 × 10⁻⁵ m³/s in standard SI measurement.

Conversion to SI Unit: cubic meter per second (m³/s)
1 gal (US)/min = 6.30902 × 10⁻⁵ m³/s

Liter/minute

L/min
Standard Unit

A Liter/minute (L/min) is a recognized unit for volumetric flow rate.

Applications & Practical Context

In practical flow terms, a standard water-saving residential bathroom showerhead water flow limit equals 9 L/min, a standard domestic kitchen sink faucet aerator maximum flow rate equals 6 L/min, a resting adult human pulmonary ventilation air inhalation flow rate equals 6 L/min.

Physical Setup

A physical magnitude of 1 L/min corresponds to 1.666667 × 10⁻⁵ m³/s in standard SI measurement.

Conversion to SI Unit: cubic meter per second (m³/s)
1 L/min = 1.666667 × 10⁻⁵ m³/s

Domain Metrology & Engineering Applications

Governing Law & Equation

Hydrodynamic Continuity Equation (Q = A · v̄)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using electromagnetic inductive flowmeters, ultrasonic transit-time meters, turbine flowmeters, and differential orifice plates.

Primary Industry Sectors

Applied across municipal water supply distribution, chemical process loops, oil & gas pipeline custody transfer, and HVAC hydronic balancing under international metrology standard ISO 80000-4:2019, ASME MFC-3M.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering ReferenceReference ValueConverted to Liter/minute
EPA WaterSense certified residential bathroom sink faucet flow limit (1.5 gpm)1.5 gpm5.678118 L/min
Standard residential outdoor garden hose discharge delivery flow rate (5 gpm)5 gpm18.927059 L/min
Commercial building automatic fire sprinkler head water discharge rate (25 gpm)25 gpm94.635295 L/min
Fire department commercial attack line firefighting hose water delivery (150 gpm)150 gpm567.811768 L/min
Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 80000-4:2019, ASME MFC-3M and the BIPM SI Brochure (9th Edition). Governed by Hydrodynamic Continuity Equation (Q = A · v̄) under ISO 80000 dimensional vector [L³ T⁻¹].

Multi-Variable Engineering Bridge Precision Fluid Continuity

Volumetric Flow & Fluid Continuity Bridge (GPM • CFM • m³/h • L/min • L/s • ft³/h)

Directly convert mass flow rate (ṁ) into volumetric flow (Q) across process fluids using the thermodynamic continuity equation ṁ = ρ × Q, bridging mass flow [M T⁻¹] and volumetric flow [L³ T⁻¹] via fluid density (ρ).

Q = ṁ / ρ
Live Calculated Bridge Equivalent:
1 gal (US)/min at Water (20°C / Standard Ambient) = 0.001002 GPM
Equals 0.0001339 CFM • 0.0002275 m³/h • 0.003792 L/min
US Pump Standard
0.001002
GPM
US Gallons per Minute
Air / Gas Flow
0.0001339
CFM
Cubic Feet per Minute
Metric Standard
0.0002275
m³/h
Cubic Meters per Hour
Hydraulics & Lab
0.003792
L/min
Liters per Minute
High Volume
6.3204 × 10⁻⁵
L/s
Liters per Second
Burners & Fuel
0.008
ft³/h
Cubic Feet per Hour
  1. 1. Normalize Input to SI Base Unit (kg/s):
    ṁ = 1 gal (US)/min × 6.30901964 × 10⁻⁵ = 6.30901964 × 10⁻⁵ kg/s
  2. 2. Apply Engineering Parameter (ρ):
    Selected condition: Water (20°C / Standard Ambient) at ρ = 998.2 kg/m³
  3. 3. Execute Governing Physical Law in SI Units:
    Q = ṁ / ρ = (6.30901964 × 10⁻⁵) ÷ (998.2) = 6.320396 × 10⁻⁸ m³/s
  4. 4. Convert to Standard Engineering Units:
    • GPM: 6.320396 × 10⁻⁸ × 15850.3231 = 0.001002 GPM (US Gallons per Minute) • CFM: 6.320396 × 10⁻⁸ × 2118.88 = 0.0001339 CFM (Cubic Feet per Minute) • m³/h: 6.320396 × 10⁻⁸ × 3600 = 0.0002275 m³/h (Cubic Meters per Hour) • L/min: 6.320396 × 10⁻⁸ × 60000 = 0.003792 L/min (Liters per Minute) • L/s: 6.320396 × 10⁻⁸ × 1000 = 6.3204 × 10⁻⁵ L/s (Liters per Second) • ft³/h: 6.320396 × 10⁻⁸ × 127132.8002 = 0.008 ft³/h (Cubic Feet per Hour)
Explore Full Density Converter →
Engineering Substance / Operating Standard Parameter Value (kg/m³) Reference State / Condition Typical Industrial & Engineering Application
Water (20°C / Standard Ambient) 998.2 20°C (68°F), 1 atm Hydronic HVAC & cooling water (NIST)
Water (4°C / Maximum Density) 1000 4°C (39.2°F), 1 atm Pure metrology reference standard (SG = 1.0)
Water (100°C / Saturated Liquid) 958.4 100°C (212°F), 1 atm Boiler condensate returns & district hot water
Saturated Steam (100°C, 1 atm) 0.5977 100°C, 1.01325 bar Boiler steam piping & relief headers (IAPWS-97)
Air (Standard Ambient / NTP 20°C) 1.204 20°C (68°F), 101.325 kPa (ISO 5011) Compressor SCFM rating, blower sizing & HVAC duct air
Air at STP (0°C, 1 atm) 1.292 0°C (32°F), 101.325 kPa (IUPAC) Standard European gas metering & chemical plant feeds
Diesel Fuel (EN 590 / No. 2-D, 20°C) 832 20°C (68°F), ASTM D975 / EN 590 Engine fuel telemetry, BSFC dyno & generator consumption
Gasoline / Petrol (ASTM D4814, 15°C) 740 15°C (59°F), ASTM D4814 Automotive port & direct fuel injector calibrations
Natural Gas / Methane (STP: 0°C, 1 atm) 0.717 0°C, 1 atm (Pure CH₄ approximation) Gas turbine firing rate & burner pipeline supply
Engine Lubricating Oil (SAE 30, 20°C) 885 20°C, typical kinematic grade 100 cSt Engine lube circuits, turbo feed lines & cooling loops
Hydraulic Oil (ISO VG 46, 20°C) 870 20°C, mineral hydraulic fluid Hydraulic power packs, cylinder pump flows & servo valves
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Frequently Asked Questions

There are exactly 3.78541178 liters/minute (L/min) in 1 gallon (us)/minute (gal (US)/min). To calculate larger amounts manually, simply multiply your total number of gallons (us)/minute by the conversion multiplier of 3.78541178.

The mathematical formula to convert gallons (us)/minute to liters/minute is: [value] * 3.78541178 = liters/minute. Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from liters/minute back to gallons (us)/minute, you must divide your starting value by 3.78541178. Our bidirectional tool automatically computes this inverse equation the moment you type into the liter/minute input field.

1 Gallon (US)/minute is larger than 1 Liter/minute. Specifically, 1 Gallon (US)/minute equals exactly 3.78541178 liters/minute, making it 3.7854 times larger (a difference of 0.58 orders of magnitude). Therefore, quantities expressed in liters/minute require a larger numerical value to represent the same physical amount.

A typical EPA WaterSense certified residential bathroom sink faucet flow limit (1.5 gpm) measures 1.5 gpm, which corresponds to 5.6781 Liter Per Minute (Liter/minute).

The established volumetric ratio is 1 gal (US)/min = 3.78541 L/min.

The flow rate equation evaluates as V(L/min) = V(gal (US)/min) × 3.78541.

Calculate the reverse flow rate using V(gal (US)/min) = V(L/min) × 0.264172.

This ratio is the global standard for specifying fluid displacement in centrifugal pumps and hydraulic power units.

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