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Accurate flow rate conversion tool for m³/h and L/s
Convert cubic metres per hour to litres per second instantly with precise calculations. Includes bidirectional conversion and detailed flow rate breakdowns for 2026.
Professional flow rate conversion for water supply, hydraulics, and environmental engineering
Convert cubic metres per hour to litres per second using the exact factor of 0.27778 L/s per m³/h. Our tool delivers precise flow rate results for any application, from domestic water supply systems to large-scale industrial processes and stormwater drainage.
Switch seamlessly between m³/h to L/s and L/s to m³/h conversion modes. Get instant results with a complete flow rate breakdown including litres per minute, cubic metres per minute, and cubic feet per hour from a single input value.
Essential for hydraulic engineers, plumbers, environmental consultants, and water utility professionals who need to convert between common metric flow rate units used in pump datasheets, pipe sizing, irrigation design, and water treatment plant specifications in 2026.
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Cubic metres per hour (m³/h) and litres per second (L/s) are both metric units of volumetric flow rate used extensively in engineering and environmental science. The conversion between them is based on two simple facts: there are 1,000 litres in one cubic metre, and 3,600 seconds in one hour. Therefore, 1 m³/h = 1000 ÷ 3600 L/s = 0.27778 L/s. Conversely, 1 L/s = 3.6 m³/h.
Both units are part of the metric system and are widely used in hydraulic engineering, water supply, and construction projects. The choice between m³/h and L/s often depends on the application — pump manufacturers commonly use m³/h, while environmental and civil engineers often prefer L/s for river flows, drainage, and pipe flow calculations in 2026.
Example: 36 m³/h ÷ 3.6 = 10 L/s | 25 L/s × 3.6 = 90 m³/h
1 m³/h = 0.27778 L/s = 16.667 L/min = 1,000 L/h = 0.016667 m³/min = 0.000278 m³/s
Use the reference table below to quickly look up common m³/h to L/s conversions for pump selection, pipe sizing, drainage design, and water management applications.
| m³/h | L/s | L/min | L/h | m³/min |
|---|---|---|---|---|
| 0.5 m³/h | 0.1389 L/s | 8.333 L/min | 500 L/h | 0.00833 m³/min |
| 1 m³/h | 0.2778 L/s | 16.667 L/min | 1,000 L/h | 0.01667 m³/min |
| 2 m³/h | 0.5556 L/s | 33.333 L/min | 2,000 L/h | 0.03333 m³/min |
| 5 m³/h | 1.3889 L/s | 83.333 L/min | 5,000 L/h | 0.08333 m³/min |
| 10 m³/h | 2.7778 L/s | 166.667 L/min | 10,000 L/h | 0.16667 m³/min |
| 18 m³/h | 5.000 L/s | 300 L/min | 18,000 L/h | 0.3000 m³/min |
| 36 m³/h | 10.000 L/s | 600 L/min | 36,000 L/h | 0.6000 m³/min |
| 50 m³/h | 13.889 L/s | 833.333 L/min | 50,000 L/h | 0.83333 m³/min |
| 72 m³/h | 20.000 L/s | 1,200 L/min | 72,000 L/h | 1.2000 m³/min |
| 100 m³/h | 27.778 L/s | 1,666.7 L/min | 100,000 L/h | 1.6667 m³/min |
| 360 m³/h | 100.000 L/s | 6,000 L/min | 360,000 L/h | 6.0000 m³/min |
The conversion from m³/h to L/s is one of the most commonly used flow rate conversions in the metric system. Because both units belong to the metric system, the conversion is clean and straightforward — simply divide by 3.6 or multiply by 0.27778. To reverse it (L/s back to m³/h), multiply by 3.6. This simple relationship makes m³/h and L/s very easy to work between on any construction or engineering project.
m³/h → L/s: Divide by 3.6 (or multiply by 0.27778)
L/s → m³/h: Multiply by 3.6
1 m³/h = 0.27778 L/s = 16.667 L/min = 1,000 L/h
The m³/h to L/s conversion appears across virtually every water-related engineering discipline. Pump manufacturers often publish performance curves in m³/h, while hydraulic engineers calculating pipe friction losses and velocity using the Hazen-Williams or Darcy-Weisbach equations prefer L/s as it aligns more naturally with pipe flow calculations. Having both values readily available reduces calculation errors on site and in design documentation.
Residential and commercial water supply systems are designed using L/s for demand calculations, while pump equipment is rated in m³/h. Converting between the two is a daily task for hydraulic engineers sizing domestic booster pumps, fire suppression systems, and building services pipework in 2026.
Stormwater design standards in Australia and internationally express peak flow rates in L/s or m³/s, while drainage channel capacities are often given in m³/h. Civil engineers convert between units constantly when checking that pipes and channels have sufficient capacity to handle design storm events.
Water treatment and wastewater facilities process flows that must be monitored in both L/s for instantaneous flow readings and m³/h for hourly throughput reporting. Converting accurately ensures correct chemical dosing rates, filter loading rates, and regulatory compliance reporting.
Irrigation designers specify sprinkler and drip emitter outputs in L/s or L/h, while pump and mainline sizing is performed in m³/h. Accurate conversion ensures irrigation systems deliver the correct water application rates without over- or under-irrigating crops and landscapes.
Both m³/h and L/s measure the same physical quantity — volumetric flow rate — but at different scales. Litres per second gives a smaller numerical value and is preferred when discussing instantaneous or real-time flow, such as the output of a tap or a small pump. Cubic metres per hour gives a larger numerical value and is more intuitive for bulk flow discussions, such as daily water usage or hourly pump throughput. Numerically, 1 L/s = 3.6 m³/h — so values in m³/h are always 3.6 times larger than the equivalent L/s value.
Use L/s for pipe hydraulics, drainage design, and real-time flow monitoring where instantaneous rates matter. Use m³/h for pump selection, equipment datasheets, and bulk volume throughput calculations. Both are metric units — our converter makes switching between them instant and error-free for all 2026 projects.
A frequent error is dividing by 1,000 instead of 3,600 when converting m³/h to L/s. Remember: 1 m³ = 1,000 litres, and 1 hour = 3,600 seconds. The combined factor is 1,000 ÷ 3,600 = 0.27778 (or simply divide by 3.6). Using the wrong divisor produces results that are 3.6× too large — a critical error in pump or pipe sizing.
Flow rate conversions between m³/h and L/s are fundamental to hydraulic engineering. Whether sizing pumps, designing pipelines, or calculating drainage capacity, accurate unit conversion is critical for every water-related project in 2026.
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