Net national product (NNP) refers to gross national product (GNP), i.e. the total market value of all final goods and services produced by the factors of production of a country or other polity during a given time period, minus depreciation. Similarly, net domestic product (NDP) corresponds to gross domestic product (GDP) minus depreciation. Depreciation describes the devaluation of fixed capital through wear and tear associated with its use in productive activities.

Closely related to the concept of GNP is another concept called NNP of a country. NNP is a more accurate measure of total value of goods and services by a country. It is derived from GNP figures. As a rough estimate, GNP is very useful indicator of total production of a country. But if we are interested to have an accurate and true measure of what a country is producing and what is available for uses, then GNP has a serious defect.

In national accounting, net national product (NNP) and net domestic product (NDP) are given by the two following formulas:

${\displaystyle NNP=GNP-Depreciation}$

${\displaystyle NDP=GDP-Depreciation}$