Traditional approaches to value household production of non-market services typically rest on stringent assumptions and demanding data requirements. This paper develops an alternative method for attributing a monetary value to non-market activities, taking advantage of questions on experienced well-being available in a number of national time-use surveys. Our valuation model allows computing the shadow price of time by activity, even for those activities for which no market price equivalents of the goods and services produced exist. Our results show that the value of unpaid work ranges from the 25% of GDP in the United States to 49% in Italy; while the share of the value of leisure to GDP ranges from 13% in France to 33% in the United Kingdom.