Flow Rate Unit Converter

Converts volumetric flow rates. GPM and L/min are common for liquids; CFM for air ducts; m³/h for municipal and industrial systems. All units here measure volume per time (not mass flow).

GPM
GPM (US gal/min)
10
L/min
37.8541
m³/h
2.271246
CFM (ft³/min)
1.33681

About the Flow Rate Converter

Volumetric flow rate measures how much fluid passes a cross section per unit time, appearing as liters per minute on European pump curves and gallons per minute on US pool equipment. HVAC ductwork quotes cubic feet per minute of air while municipal water mains discuss cubic meters per hour for billing-scale infrastructure. Conversion errors oversize pumps, wasting energy, or starve irrigation zones during peak summer draw.

Plumbers matching fixture demand to supply lines sum simultaneous appliance flows converted to a common unit before selecting pipe diameter from friction loss charts. Breweries and dairies meter product lines in hectoliters per hour while American craft kits still think in gallons per minute through mash tun manifolds.

Medical oxygen and IV drip rates use milliliters per hour or drops per minute, another domain demanding careful unit discipline adjacent to engineering scales. Oil pipeline throughput in barrels per day enters geopolitical news distinct from refinery internal gallon-per-minute process flows converted for comparison.

Aquarium and hydroponic hobbyists size return pumps by tank turnover times, converting manufacturer liter-per-hour ratings into minutes for a full cycle. Fire suppression codes specify minimum gallons per minute at residual pressure, non-negotiable figures for compliance audits.

Use this converter when reading multinational pump datasheets, designing sprinkler branches, or explaining to homeowners why a well yield in gallons per minute limits how many bathrooms can run showers concurrently.

Specialized tools

Frequently asked questions

Multiply GPM by 3.78541 to get L/min. Example: 10 GPM ≈ 37.85 L/min. US gallons differ from imperial gallons used in some UK docs.

Cubic feet per minute measures volumetric airflow in HVAC fans and compressors. It is not interchangeable with liquid GPM without knowing medium density.

Higher flow through a fixed pipe raises velocity and friction loss. Convert all sources to one unit before summing demand and sizing pipe.