Creating sustainability metrics is one of the means to achieve Goal 12 of the United Nations Sustainable Development Goals. Developing and disseminating sustainability calculators is fundamental to directing the attention of more households towards the sustainability of their own consumption. The purpose of this article is the creation of a measurement tool for sustainable household consumption. It presents the interdisciplinary logic behind calculating an index to measure sustainable consumption at the household level. The software design and software implementation of the calculator are presented, resulting in a working tool that can be widely distributed.