Flow Rate Converter
Convert between L/s, L/min, m³/h, GPM and ft³/s.
Liters/minute (L/min)
37.85412
from 10 US gallons/minute
Liters/second (L/s)
0.630902
Cubic meters/hour
2.271247
US gallons/minute
10
Cubic feet/second
0.02228
AI Breakdown & Smart Takeaway
Plain-English insight on your numbers
Get a personalized explanation of what these results mean — and how to improve them.
How the Flow Rate Converter works
The Flow Rate Converter instantly translates volumetric flow measurements between liters per second (L/s), liters per minute (L/min), cubic meters per hour (m³/h), US gallons per minute (GPM), and cubic feet per second (ft³/s) — making it essential for engineers, plumbers, HVAC technicians, and anyone working across metric and imperial fluid systems.
Flow rate describes how much fluid volume passes a given point per unit of time. Because different industries and regions have standardized around different unit systems — metric in Europe and most of the world, US customary in North America — the same physical flow can be expressed in wildly different numbers. A municipal water engineer might specify a pump in m³/h, while a US irrigation contractor thinks in GPM, and a hydraulics textbook uses L/s. This converter eliminates the manual arithmetic between those worlds by applying precise, fixed conversion factors derived from the exact definitions of each unit.
The tool works by normalizing your input to a common base unit internally — typically liters per second — and then multiplying by the exact factor for each target unit. For example, 1 L/s equals exactly 60 L/min, 3.6 m³/h, 15.8503 US GPM, and 0.035315 ft³/s. Because these are pure unit-definition conversions (not empirical approximations), the results are exact to the precision of the conversion factors themselves. There is no rounding error introduced by the conversion logic — only by how many decimal places you choose to display.
A common mistake users make is confusing US gallons per minute with Imperial (UK) gallons per minute. One US gallon equals approximately 3.785 liters, while one Imperial gallon equals approximately 4.546 liters — a difference of about 20%. This matters enormously when sizing pumps or specifying pipe capacity for systems that cross the Atlantic. Our converter uses US GPM by default, which is standard in North American engineering and the most commonly searched unit online. If you are working with UK specifications, remember to account for this distinction separately.
Another frequent source of confusion is conflating volumetric flow rate with velocity or mass flow rate. This converter handles volumetric flow only — the volume of fluid moving per unit time, regardless of fluid density or pipe diameter. If you need to convert to mass flow (kg/s, lb/min), you must also know the fluid's density. If you need fluid velocity in a pipe, you must additionally know the pipe's cross-sectional area. For pure unit-to-unit volume-flow conversion, however, this tool gives you fast, reliable results across all five major units used in modern engineering practice.
Formula
Base: 1 L/s = 60 L/min = 3.6 m³/h = 15.85032 US GPM = 0.0353147 ft³/s Conversion: Target value = Input value × (Target factor / Input unit factor)
Pro tips
- Always confirm whether a GPM specification is US or Imperial gallons — the 20% difference can lead to a significantly undersized or oversized pump selection.
- When working on HVAC chilled-water or heating systems, convert your design flow to m³/h early in the project, as most European equipment datasheets and pump curves use this unit.
- For quick mental estimation, remember that 1 L/s ≈ 16 GPM and 1 GPM ≈ 0.063 L/s — useful sanity checks when reviewing converted results in the field.
- If you are comparing flow rates from different sources, normalize everything to L/s first before comparing, since it sits naturally in the middle of the SI unit hierarchy and avoids very large or very small numbers for most practical flows.
- When converting for pipe-sizing purposes, always pair your flow rate with pipe velocity calculations — converting units correctly is only the first step; the flow must also be within acceptable velocity limits for the pipe material and application.
Key terms
- Volumetric Flow Rate
- — The volume of fluid that passes through a cross-section per unit of time, expressed in units such as L/s, GPM, or m³/h.
- GPM (Gallons Per Minute)
- — A US customary unit of flow rate equal to one US gallon (3.78541 liters) flowing past a point each minute, widely used in plumbing and fire suppression systems.
- L/min (Liters Per Minute)
- — A metric flow rate unit commonly used in medical, laboratory, and light industrial applications where smaller flow volumes are measured.
- m³/h (Cubic Meters Per Hour)
- — A metric flow rate unit standard in industrial, HVAC, and municipal water engineering for describing large-volume flows.
- ft³/s (Cubic Feet Per Second)
- — A US customary unit primarily used in hydrology and civil engineering to express large natural or infrastructure water flows such as rivers and stormwater channels.
- Conversion Factor
- — A fixed numerical ratio between two units that allows exact mathematical translation of a measurement from one unit system to another without changing the underlying physical quantity.
