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Engineering
Flow Rate Conversion Table
Values shown for 1 Cubic Meter per Second
About Flow Rate Conversions
Volumetric flow rate measures how much fluid volume passes a point per unit of time. The SI unit is the cubic metre per second (m³/s), but practitioners almost never work at that scale — plumbing uses litres per minute, irrigation uses litres per second or cubic metres per hour, and HVAC balances run on cubic feet per minute (CFM). A key trap in international work is the gallon: the US gallon equals 3.785411784 L while the UK (imperial) gallon equals 4.54609 L, so 1 UK gpm is about 1.201 US gpm. Mixing them silently distorts pump and piping specifications by roughly 20%. A modern efficient shower head flows around 9.5 L/min (2.5 US gpm), while a garden hose at full open delivers 40 to 60 L/min. HVAC engineers translate refrigeration tonnage to airflow: rooftop units often spec 400 CFM per ton. Our converter uses exact SI-to-imperial relationships so that pump head, pipe sizing, and cooling tower duty calculations remain consistent across regions.
| Unit Name | Symbol | Value | Formula |
|---|---|---|---|
| Cubic Foot per Minute | CFM | 2118.88 | multiply by 4.71947443 × 10⁻⁴ |
| Cubic Foot per Second | CFS | 35.3147 | multiply by 0.028316847 |
| Cubic Meter per Hour | m³/h | 3600 | divide by 3,600 |
| Cubic Meter per Minute | m³/min | 60 | divide by 60 |
| Cubic Meter per Second | m³/s | 1 | base unit |
| Liter per Hour | L/h | 3600000 | multiply by 0.001/3600 |
| Liter per Minute | L/min | 60000 | multiply by 0.001/60 |
| Liter per Second | L/s | 1000 | multiply by 0.001 |
| Milliliter per Second | mL/s | 1000000 | multiply by 1 × 10⁻⁶ |
| UK Gallon per Minute | UK gpm | 13198.2 | multiply by 7.57681667 × 10⁻⁵ |
| US Gallon per Hour | US gph | 951019 | multiply by 1.05150327 × 10⁻⁶ |
| US Gallon per Minute | US gpm | 15850.3 | multiply by 6.30901964 × 10⁻⁵ |