Definition
Social Return on Investment (SROI) is an evaluation framework that assigns monetary values to social, environmental, and economic outcomes to calculate how much social value is created per unit of investment. A SROI ratio of 3:1, for example, means every dollar invested generates three dollars of social value. SROI monetises outcomes by assigning proxy financial values to changes: if a job training programme places participants in employment, SROI calculates the economic value of that employment; if a health programme prevents disease, SROI calculates the value of prevented healthcare costs and productivity gains. SROI is used to communicate programme impact to donors, policymakers, and investors in financial language they understand.
Why It Matters
Demonstrating the social value of programmes is critical for funding and policy influence. But social outcomes (children educated, lives saved, women empowered) are hard to compare across programmes or advocate with. SROI translates these outcomes into a single financial metric, making comparison and communication easier. A donor considering whether to fund five different programmes can compare their SROI ratios to see which generates the most value per dollar. Policymakers considering investment in violence prevention can compare SROI to other public investments. However, SROI is controversial. Assigning monetary values to human outcomes (How much is a prevented suicide worth? How do you value improved wellbeing?) involves assumptions that may oversimplify or distort. SROI works best as one of several evaluation approaches, not as the sole measure of programme value.
In Practice
An education programme shows: 500 adolescents completed vocational training, 350 found employment, with annual earnings averaging $2,500 per person. The programme's total cost was $125,000. SROI calculates: social value of employment = 350 people × $2,500 × 10 years of earnings = $8.75 million (using conservative lifetime projection). SROI ratio = $8.75M / $125K = 70:1. The programme generated 70 dollars of economic value per dollar invested. A mental health programme prevents 50 suicides per year (using prevention rates from evidence). Using standard cost-of-life values, prevented suicides = 50 × $1 million average human lifetime value = $50M value. Total programme cost = $5M. SROI = 10:1. These ratios are compelling for funders, though they rest on assumptions (lifetime employment, suicide prevention attribution, proxy values) that should be transparent.
Related Topics
- Value for Money, Broader assessment of programme efficiency and effectiveness beyond financial metrics
- Contribution Analysis, Method for establishing whether and how a programme contributed to outcomes
- Impact Evaluation, Rigorous assessment of outcomes and attributable impact
- Evaluation Criteria (DAC), Framework for judging programme relevance, effectiveness, efficiency, impact, and sustainability