Flow Rate Converter Calculator
Liquid Flow Rate
Convert between liquid flow rate units
Gas Flow Rate (CFM)
Convert between gas/air flow rate units
Pipe Flow Rate
Calculate flow rate from pipe diameter and velocity
Formula
1 GPM = 3.785 LPM = 0.2271 m³/h | 1 CFM = 1.699 m³/h | Flow = Area x Velocity
Frequently Asked Questions
How do I convert GPM to LPM?
Multiply GPM by 3.78541 to get LPM. For example, 10 GPM = 37.85 LPM. One US gallon equals 3.78541 liters.
What is CFM and when is it used?
CFM (Cubic Feet per Minute) measures air or gas flow rate. It is commonly used for HVAC systems, air compressors, ventilation fans, and pneumatic tools.
How do I calculate flow rate from pipe diameter?
Flow Rate = Cross-sectional Area x Velocity. The area is calculated as pi x (diameter/2)². For example, a 2-inch pipe with 5 ft/s velocity flows at about 98 GPM.
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