Grit has been linked to increased performance, retention and well-being in various fields. Defined as having perseverance and passion for long-term goals, grit is a personality trait related to one's perseverance of effort (perseverance) and consistency of interests (passion) toward their goals. In the fifteen years since the original grit scale was published, many studies have investigated factors that promote grit. However, a scale has not yet been developed measuring characteristics that can contribute to higher levels of grit. This study aimed to develop a novel scale to measure the psychological resources of grit. The Delphi technique was used to obtain consensus from an international panel of academics and practitioners who are experts in grit and related constructs. A total of 30 participants rated 100 scale items conducted over three rounds of online surveys. Experts agreed that items selected for the final scale (n = 20) were essential, with 85% rating these as important or very important. This scale would be a helpful diagnostic tool for practitioners involved in staff development and support building capabilities that contribute to goal achievement.