Background We aimed to investigate the burden of informal care in Hungary (HU), Poland (PL) and Slovenia (SI). Methods A cross-sectional online survey was performed involving representative samples of 1000 respondents per country. Caregiving situations were explored health status of informal caregivers/care recipients and care-related quality of life were assessed using the EQ-5D-5L and CarerQol-7D. Results The proportion of caregivers was (HU/PL/SI) 14.9, 15.0 and 9.6%, respectively.