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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 |