Flow Rate Converters
Convert between volumetric flow rate units including L/s, L/min, L/h, m³/s, m³/h, gpm (US & UK), cfm, and cfs using exact time-base relationships.
Explanation
Volumetric flow rate is volume per unit time. This hub normalizes factors through liters per second (L/s), applies exact time-base scaling across per-second, per-minute, and per-hour units, and preserves the US vs UK gallon distinction through fixed definitions. For clarity, conversions are grouped into SI-only, cross-system, and imperial-only pairs.
The Flow Rate hub maps related converter families into directional routes with consistent assumptions.
Read more
Open a family hub to reach leaf pages with direct answers, calculator output, and reverse links built on the same constants.
Frequently Asked Questions
What is the SI unit of volumetric flow rate?
The SI base expression is cubic meters per second (m³/s).
How are L/s and m³/s related?
Exactly: 1 m³ = 1000 L, so 1 m³/s = 1000 L/s.
Why are US gpm and UK gpm different?
They are based on different gallon definitions: 1 US gallon = 3.785411784 L, while 1 UK gallon = 4.54609 L.
How are cfm and cfs related?
They are the same cubic-foot volume with different time bases, so 1 cfs equals exactly 60 cfm.
Are flow rate conversions multiplicative?
Yes. Flow rate families use multiplicative factors with no additive offsets.
How do I switch direction?
Use the switch button to navigate directly to the mirror page for the reverse conversion.