Background: Quality of life outcomes for family carers and patients may be measured in different ways within the same economic evaluation. Methods: We used the wellbeing valuation method to calculate "exchange rates" between care-related outcomes (the Carer Experience Scale and CarerQoL-7D) and health-related (the EQ-5D-5L) outcomes. Data on quality of life outcomes were collected through a postal quality of life survey in the UK.