Abstract: A computer-implemented method for calculating an estimated flare volume of natural gas produced from a well is determined as function of reduced volumes sent to a sales line or gathering system. The method includes the steps of determining a baseline static pressure for the gathering system with a static pressure gauge, determining a baseline gas sales rate with a gas sales line flowmeter, identifying a high static pressure event with the static pressure gauge, determining a lost gas sales volume during the high static pressure event, and determining the estimated flare volume as a function of the lost gas sales volume during the high static pressure event.