Flow Rate Converter

Convert GPM, liters per minute, CFM, and cubic meters per hour.

Volumetric flow answers how much fluid crosses a point per unit of time, and the four columns here are the ones pump curves, ductwork schedules and process datasheets are actually printed in: US gallons per minute, litres per minute, cubic feet per minute and cubic metres per hour. Internally everything lands on m³/s. GPM enters at 6.30901964e-5 m³/s, LPM at one litre spread over sixty seconds, CFM at 0.028316846592 m³ over sixty seconds, and m³/h at one over 3600. Passing through that common base means GPM to LPM emerges at the familiar 3.785 ratio without a second rounding step. Two limits matter more than the arithmetic does. This is volume per time, never mass per time — reaching kg/s needs a density the tool never asks for. And for compressible gas a bare CFM figure is ambiguous: actual cubic feet per minute at line pressure and a standard figure referenced to 14.696 psia and 60 °F can differ several-fold, and whichever you paste in will be converted without complaint. The gallon is the US liquid gallon; no pipe size, velocity or pressure drop is modelled.