The present invention relates to a quotation calculation system and method for an LNG import terminal for calculating an estimate according to an order request of an LNG import terminal for storing and supplying LNG from a customer. The present invention is a constraint input unit for inputting a constraint required by the ordering party of the LNG import terminal; A variable input unit for inputting a variable for a process characteristic changeable at an order receiving end of an LNG import terminal for each of a plurality of cases; A database unit storing data including physical properties of LNG and size and price of facilities; A calculation unit configured to calculate a result value including at least one of BOG generation amount, facility quantity, and investment cost of the LNG import terminal for each of the plurality of cases using constraints, variables, and data; A comparison unit comparing the result values according to each case; A preliminary calculator configured to calculate a preliminary estimate of a case corresponding to the selected result among the result values; A quotation calculation unit for calculating a final quotation from the preliminary quotation; It includes. As a result, it is possible to stably receive orders by comparing various process plans with minimum effort and low labor force, while improving the competitiveness and minimizing risks, which are suitable for the request of the client.
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