Net Domestic Product (NDP) is an economic measure that represents the net value of all finished goods and services produced within a countrys geographic borders during a given period. It is calculated by subtracting the value of depreciation of capital assets of the nation such as machinery, housing, and vehicles from the Gross Domestic Product (GDP). The depreciation is also referred to as capital consumption allowance (CCA) and represents the amount needed to replace those depreciated assets. NDP accounts for capital that has been consumed over the year in the form of housing, vehicle, or machinery deterioration. It is a key indicator of a countrys economic growth and is reported quarterly by the Bureau of Economic Analysis (BEA).

NDP is considered a better measure of social and economic well-being than GDP by some economists because it takes into account the depreciation of capital assets. If the country is not able to replace the capital stock lost through depreciation, then GDP will fall. A growing gap between GDP and NDP indicates increasing obsolescence of capital goods, while a narrowing gap means that the condition of capital stock in the country is improving.

NDP is calculated using the formula NDP = GDP - Depreciation. It is one of the key gauges of economic growth, along with GDP, Gross National Income (GNI), disposable income, and personal income.

It is important to note that NDP is not related to the Neighbor Discovery Protocol (NDP), which is an IPv6 protocol responsible for tasks such as stateless autoconfiguration, address resolution, Neighbor Unreachability Detection (NUD), and Duplicate Address Detection (DAD).