1 US gallon per minute (gpm) is equal to 0.0630901964 liters per second (L/s). To convert gallons per minute to liters per second, multiply the gallons per minute value by 0.0630901964 or divide by 15.850323141. For example, to convert 500 gpm to L/s, divide 500 by 15.850323141, that makes 31.545 L/s is 500 gpm.