Litres per Hour (L/hr)
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Equivalent flow rate
Accurate conversion between litres per minute (L/min) and litres per hour (L/hr)
Convert litres per minute to litres per hour instantly with precise calculations for 2026. Includes reverse L/hr to L/min conversion, cubic metres per hour, gallons per minute, millilitres per second, full formula reference, and flow rate reference tables for common applications.
Professional flow rate conversion for plumbing, hydraulics, water treatment, HVAC, and industrial process engineering
Convert litres per minute to litres per hour using the exact SI time relationship: 1 L/min = 60 L/hr (exactly, since 1 hour = 60 minutes by definition). Our tool outputs L/hr, cubic metres per hour (m³/hr), cubic metres per second (m³/s), gallons per minute (UK and US), millilitres per second (mL/s), and cubic feet per minute (CFM) simultaneously — giving you a complete multi-unit flow rate breakdown in one step.
Switch seamlessly between L/min → L/hr and L/hr → L/min conversion modes. Whether you are reading a pump datasheet in L/min and need L/hr for a process mass balance, converting water meter readings, sizing pipework, checking boiler flow rates, or comparing HVAC chilled water flow specifications, both directions are handled instantly from a single input.
Essential for plumbing and pipework design, hydraulic system engineering, water treatment plant operation, boiler and HVAC system commissioning, pump selection and sizing, irrigation system design, pool and spa filtration, chemical dosing systems, industrial process flow monitoring, and any application in 2026 where volumetric flow rates must be expressed in different time-based units.
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Litres per minute (L/min or LPM) is a volumetric flow rate unit expressing the volume of fluid passing a point in one minute. It is one of the most widely used flow rate units in engineering, plumbing, HVAC, and industrial process work worldwide. A domestic tap typically flows at about 6–12 L/min, a shower head at 8–15 L/min, a domestic hot water boiler circulating pump at 10–25 L/min, and a large industrial centrifugal pump at thousands of L/min. The litre per minute is practical because it gives manageable numbers for most everyday and engineering flow scenarios.
Litres per hour (L/hr or LPH) expresses the same quantity over a one-hour period. The conversion is exact and simple: 1 L/min = 60 L/hr, because there are exactly 60 minutes in one hour. L/hr is preferred in contexts where flows are small or where hourly totals are more meaningful — for example, chemical dosing pumps are often rated in L/hr, boiler fuel consumption is expressed in L/hr, and drip irrigation emitters are specified in L/hr. Both units measure the same physical quantity; the choice depends on which produces the most convenient numerical value for the application. For related volume conversions, see our unit conversion tools.
1 L/min = 60 L/hr exactly | 1 hour = 60 minutes (by definition)
| L/min | L/hr | m³/hr | US GPM | UK GPM | Typical Application |
|---|---|---|---|---|---|
| 0.1 L/min | 6 L/hr | 0.006 m³/hr | 0.0264 GPM | 0.0220 GPM | Drip emitter / dosing pump |
| 0.5 L/min | 30 L/hr | 0.030 m³/hr | 0.132 GPM | 0.110 GPM | Chemical dosing pump |
| 1 L/min | 60 L/hr | 0.060 m³/hr | 0.264 GPM | 0.220 GPM | Small drip irrigation zone |
| 2 L/min | 120 L/hr | 0.120 m³/hr | 0.528 GPM | 0.440 GPM | Bathroom basin tap |
| 5 L/min | 300 L/hr | 0.300 m³/hr | 1.321 GPM | 1.100 GPM | Water-efficient shower |
| 8 L/min | 480 L/hr | 0.480 m³/hr | 2.113 GPM | 1.760 GPM | Standard shower head |
| 10 L/min | 600 L/hr | 0.600 m³/hr | 2.642 GPM | 2.200 GPM | Kitchen tap (full flow) |
| 15 L/min | 900 L/hr | 0.900 m³/hr | 3.963 GPM | 3.300 GPM | Garden hose |
| 20 L/min | 1,200 L/hr | 1.200 m³/hr | 5.283 GPM | 4.399 GPM | Small circulating pump |
| 30 L/min | 1,800 L/hr | 1.800 m³/hr | 7.925 GPM | 6.599 GPM | Domestic hot water boiler |
| 50 L/min | 3,000 L/hr | 3.000 m³/hr | 13.21 GPM | 11.00 GPM | Medium pool pump |
| 100 L/min | 6,000 L/hr | 6.000 m³/hr | 26.42 GPM | 22.00 GPM | Commercial HVAC pump |
| 250 L/min | 15,000 L/hr | 15.00 m³/hr | 66.04 GPM | 54.99 GPM | Large chilled water pump |
| 500 L/min | 30,000 L/hr | 30.00 m³/hr | 132.1 GPM | 110.0 GPM | Industrial process pump |
| 1,000 L/min | 60,000 L/hr | 60.00 m³/hr | 264.2 GPM | 220.0 GPM | Large industrial pump |
The L/min to L/hr conversion is one of the simplest in flow measurement: multiply by 60. This is because 1 hour contains exactly 60 minutes — a fixed, defined relationship with no empirical factor, no rounding, and no approximation. 1 L/min = 60 L/hr always and exactly. The reverse is equally simple: divide L/hr by 60 to get L/min. This makes mental arithmetic straightforward for any flow rate.
Flow rate (L/min or L/hr) is the rate at which fluid moves — a continuous value. Volume (litres) is the total amount that has passed. To find volume from flow rate: Volume (L) = Flow Rate (L/min) × Time (min). For example, a 15 L/min garden hose running for 20 minutes delivers 15 × 20 = 300 litres. Always confirm whether a specification is a flow rate or a total volume before making engineering decisions.
Common flow rates to know: human heart ≈ 5 L/min at rest; domestic cold tap ≈ 6–15 L/min; efficient shower ≈ 6–9 L/min; standard shower ≈ 9–15 L/min; garden hose ≈ 10–20 L/min; domestic boiler pump ≈ 15–30 L/min; fire hydrant ≈ 600–1,500 L/min; large water main ≈ 5,000–50,000 L/min. These benchmarks help engineers and technicians sanity-check flow rate readings and pump selections.
1 L/min = 60 L/hr = 0.06 m³/hr = 16.667 mL/s = 0.2642 US GPM = 0.2200 UK GPM = 0.03531 CFM
Mental shortcut: multiply L/min by 60 to get L/hr. Divide L/hr by 60 to get L/min. Example: 25 L/min × 60 = 1,500 L/hr. For m³/hr: multiply L/min by 0.06, or divide L/hr by 1,000.
Converting L/min to L/hr is a simple multiplication. Follow these steps for complete multi-unit flow rate conversions:
Drip emitter: 0.04–0.08 L/min = 2–5 L/hr | Shower (water-saving): 6 L/min = 360 L/hr | Kitchen tap: 6–12 L/min = 360–720 L/hr | Garden hose: 15 L/min = 900 L/hr | Domestic boiler pump: 20 L/min = 1,200 L/hr | Pool pump (domestic): 50–100 L/min = 3,000–6,000 L/hr | Commercial HVAC: 200–500 L/min = 12,000–30,000 L/hr
The most frequent error is confusing L/min with L/hr on pump datasheets — always check the time unit on the flow axis of a pump performance curve. European pump manufacturers commonly publish curves in m³/hr, while some US and Australian manufacturers use L/min or GPM. Another common mistake is confusing volumetric flow rate with mass flow rate — L/min is a volume per time, while kg/min is mass per time. They are equal only for water at standard conditions (density ≈ 1 kg/L). For other fluids such as oils, acids, or hot water, always apply the fluid density to convert between volumetric and mass flow.
In plumbing and water supply, pipe flow calculations are often performed using L/s or L/min, while water authority tariffs and consumption reports use kilolitres per day or litres per hour. A plumber selecting a booster pump rated at 35 L/min needs to convert to 2,100 L/hr to compare against a building's hourly peak demand schedule. In HVAC and hydronic heating systems, chilled water and heating water flow rates are typically specified in L/min or m³/hr in equipment datasheets, but hourly energy calculations require L/hr. Converting between these units is a daily task in building services engineering and commissioning. For related energy calculations used in HVAC system design, see our kilowatts to watts converter.
In water treatment and chemical processing, dosing pumps are almost universally rated in L/hr or mL/hr because their flow rates are small and hourly dosing quantities are the key design parameter. However, the receiving water main or process stream flow is typically measured in L/min, requiring conversion to calculate correct dosing ratios. In irrigation and agriculture, drip irrigation emitters are specified in L/hr while mainline flow rates are measured in L/min or m³/hr — conversion is essential for hydraulic design of irrigation networks, scheduling, and water use reporting. For related pressure conversions used in hydraulic system design, see our atmospheres to pascals converter.
The National Institute of Standards and Technology provides authoritative definitions of SI volumetric flow rate units including cubic metres per second (m³/s) and their relationships to litres per minute, litres per hour, and other derived units used in engineering practice worldwide in 2026.
Visit NIST →The L/min to L/hr conversion factor of 60 is derived directly from the SI time unit definitions: 1 minute = 60 seconds, 1 hour = 3,600 seconds, therefore 1 hour = 60 minutes exactly. The relationship is purely mathematical — there is no empirical measurement or approximation involved, making this one of the most reliable conversions in all of engineering.
Our L/min to L/hr Tool →Explore our full library of free unit conversion tools for flow rate, pressure, power, energy, force, speed, weight, area, distance, and time. All tools are updated for 2026 standards and fully optimised for mobile and desktop use.
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