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💧 Flow Rate Conversion Calculator 2026

Convert mass flow, volume flow, and molar flow rates

1 L/min = 0.2642 gal/min [US]
Formula: value × 0.2642

📊 All Conversions

Common Flow Rate Conversions

From To Multiply by
1 L/min gal/min (US) 0.2642
1 gal/min (US) L/min 3.7854
1 m³/h L/min 16.667
1 m³/h gal/min (US) 4.4029
1 ft³/min (CFM) L/min 28.317
1 kg/s lb/min 132.28
1 kg/h lb/h 2.2046

Understanding Flow Rate

📊 Volume Flow

Volume per unit time (L/min, gpm, m³/h). Most common for liquids. Depends on temperature and pressure for gases. Used in pumps, pipes, HVAC.

⚖️ Mass Flow

Mass per unit time (kg/s, lb/min). Independent of temperature/pressure. Preferred for gases and chemical processes. Q_m = ρ × Q_v.

🔬 Molar Flow

Moles per unit time (mol/s). Used in chemical reactions and stoichiometry. n = m/M where M is molar mass. Important for reaction rates.

📐 Relationships

Mass = Density × Volume. To convert between volume and mass flow, multiply by fluid density. For water: 1 L/min ≈ 1 kg/min.

Frequently Asked Questions

How do I convert flow rate units?
Use our calculator above: enter value, select source and target units. The formula is Result = Value × Conversion Factor. All units convert through a base unit (L/s for volume, kg/s for mass).
How do I convert GPM to liters per minute?
Multiply by 3.7854. Formula: L/min = GPM × 3.7854. Example: 10 GPM = 37.85 L/min. GPM (US gallon) is common in American plumbing and HVAC.
How do I convert liters per minute to GPM?
Divide by 3.7854 or multiply by 0.2642. Formula: GPM = L/min × 0.2642. Example: 100 L/min = 26.42 GPM (US).
How do I convert m³/h to L/min?
Multiply by 16.667. 1 m³ = 1000 L, 1 hour = 60 min. So m³/h × 1000 ÷ 60 = L/min. Example: 6 m³/h = 100 L/min.
What is the difference between mass and volume flow?
Volume flow = space occupied per time. Mass flow = weight per time. Relationship: Mass = Volume × Density. Mass flow is constant; volume varies with temperature/pressure (especially gases).
How do I convert between mass and volume flow?
Mass flow = Volume flow × Density. For water (1 kg/L): 1 L/min = 1 kg/min. For other fluids, multiply by their density. Check fluid's specific gravity.
What is CFM?
Cubic Feet per Minute — volume flow rate common in US HVAC and air handling. 1 CFM = 28.317 L/min = 0.0283 m³/min. Used for fans, ducts, ventilation.
What is GPM vs GPH?
GPM = Gallons Per Minute. GPH = Gallons Per Hour. GPM × 60 = GPH. GPM is more common for higher flows (pumps), GPH for lower flows (drip irrigation).
What is a miner's inch?
Historic unit for water rights in Western US. Varies by state: CA/OR = 0.025 ft³/s, CO = 0.025 ft³/s, ID = 0.02 ft³/s. Still used in some water law contexts.
How is flow rate measured?
Flowmeters use various methods: turbine, magnetic, ultrasonic, Coriolis, rotameter, orifice plate. Choice depends on fluid, accuracy needed, pipe size, and budget.
What is normal/standard flow rate?
Normal (Nm³/h) or Standard (SCFM) conditions adjust gas volume to standard temperature/pressure (0°C & 1 atm or 15°C & 1 atm). Allows comparison regardless of actual conditions.
How do I calculate flow rate from velocity?
Q = A × v where Q = flow rate, A = cross-sectional area, v = velocity. For a pipe: Q = π × r² × v. Ensure consistent units.
What flow rate units are used in industry?
Common: L/min, m³/h (metric), GPM, CFM (US), bbl/day (petroleum). Process: kg/h, lb/h (mass). Choice depends on industry & region.
What is barrel per day (bbl/day)?
Petroleum barrel = 42 US gallons ≈ 159 liters. bbl/day is standard for oil production/refining. 1 bbl/day ≈ 0.066 L/min ≈ 0.018 gpm.
How do I convert UK vs US gallons?
1 UK gallon = 1.2 US gallons = 4.546 L. 1 US gallon = 3.785 L. Always specify which gallon. UK gallon is larger (Imperial).
What is cusec?
Cusec = cubic feet per second. Common for river/stream flow measurement. 1 cusec = 28.317 L/s = 448.8 GPM (US). Also written as cfs or ft³/s.
How accurate is this flow rate converter?
Uses standard conversion factors with high precision. For gases, actual flow depends on temperature/pressure—use standard conditions conversions for accurate comparisons.