VIVES Hogeschool and Plymouth Marjon University calculated this by using an existing method: the Social Value Engine, made by the Social Value Team in East Riding, Yorkshire. Thanks to the engine, one can calculate a monetary value to improvements on a social, human and environmental level.
Examples of these benefits are: increased employability for people with a distance to the labour market, increased self-confidence for employees and volunteers, reduced social isolation for community members, etc. The results are linked to UN’s Sustainable Development Goals (SDG). For more info, visit https://www.socialvalueengine.com/