Since last century, humanity has been using and disposing of resources at a greater rate than the Earth’s biocapacity to regenerate. Consequently, habitats are being destroyed, climate is changing and, for most, life conditions are deteriorating. To avoid collapse, humanity has been, at least in theory, trying to change the foundations of development so that it becomes ‘sustainable’ and, while meeting the social, economic and environmental needs of the present, does not compromise the ability of future generations to meet their own needs. To help on this task, in the 1960s, UNESCO proposed the establishment of laboratories for developing and testing sustainable approaches. These became known as Biosphere Reserves or, simply, biospheres. Today, Biosphere Reserves are considered to be the main instrument for testing and monitoring sustainable development approaches. By 2020, there were more than 700 biospheres in over 120 countries around the world - one third of which are located in prosperous countries with very-high human development levels. As of today, there is no mechanism to objectively measure the effectiveness of these reserves that also allows comparison between biospheres, their development approaches and outcomes, or over time. The objective of this work is to present a tool that fulfills these gaps and that, additionally, helps with establishing aspirational targets and identifying key areas that need improvement. The tool focuses on Biosphere Reserves located in countries with very-high levels of human development (but can be easily adapted to other countries); it addresses the 17 sustainable development goals and considers relevant international agreements. It is based on the rational that, to become widely used, it needs to be simple. Therefore, it uses data collected for other ends, hence available, and commonly used technology, such as excel. The tool consists of a spreadsheet that links a punctuating and a colouring system to topics, criteria, indicators and measures. The case study was on the Sunshine Coast region (Australia), which is in the process of being nominated a biosphere reserve.