An 8-item scale has been developed to measure positive experiences by informal caregivers, the Positive Experiences Scale (PES). The PES is a unidimensional hierarchical Mokkenscale which varies from intrinsic satisfaction and relational enhancement to improvement of competence and social enhancement. The scale has a satisfactory Loevinger's H-value (0.37) and reliability (0.74). Furthermore, satisfying H-values are found for large groups of informal caregivers, such as carers for the elderly, the chronically ill, partners, parents and people who live in a care facility. For informal caregivers of people with dementia or mental impairments, two items do not uphold ('I received appreciation for the care I've been giving' and 'the help brought me and my family and friends closer together'. For these groups a 6-item scale is advised. Solely for informal caregivers of people with psychological impairments, the scale as a whole does not uphold. Further research will have to determine how these caregivers derive positive experiences from caregiving. The PES is recommended because of its psychometric qualities and its usefulness in different populations of informal caregivers.