The Princess Royal Trust for Carers is a UK-wide network of 144 independent Carers’ Centres, which offer support including information, training, facilitating access to statutory services and benefits reviews. The Trust supports the network by providing a national voice for carers, and facilitating The Network to provide carers with the support they need. This report shows that an investment of less than £5 million in services provided by five carers' centres resulted in at least £73 million worth of social gains in a year. The report is a social return on investment analysis that evaluates the impact of the support given by five carers' centres (Harrogate, Hertfordshire, Lewisham, Suffolk and Westminster) over a number of years. Looking across the whole network of 144 carers’ centres supported by The Princess Royal Trust for Carers, the independent analysis estimated the gain based on total funding of £57m to be in the region of £814m per year.