Social Impact Measurement Calculator
Social impact ratio.
Calculate the Social Return on Investment (SROI) ratio for an impact investment from total investment, beneficiary count, and per-beneficiary social value.
What this tool does
This calculator models Social Return on Investment (SROI) by computing the ratio of total social value generated to the amount invested. It takes four inputs: your investment amount, the number of beneficiaries reached, the estimated lifetime value created per beneficiary, and an SROI multiplier that accounts for indirect or ripple effects. The result shows how many units of social value are produced per unit of currency invested. The lifetime value per beneficiary and beneficiary count are typically the largest drivers of the final ratio. For example, a programme serving 500 people with an average lifetime value of 5,000 per person, funded with an investment of 1 million, and applying a multiplier of 1.5 for indirect benefits, would produce a specific SROI figure. The calculator assumes beneficiary counts and value estimates are accurate and doesn't account for timing of benefits, risk factors, or valuation uncertainties. Results are for illustrative and educational purposes.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Social Return on Investment (SROI) calculator measures social value created per pound invested. 100,000 investment helping 200 beneficiaries with 2,000 lifetime value each = 400,000 social value. SROI = 4:1. Standard impact investing metric translating outcomes into financial terms for cost-benefit analysis.
Example: 100,000 invested in employment programme. 200 beneficiaries gain employment. Lifetime earnings boost 2,000 per person × 1.5 SROI multiplier (capturing wider benefits like health, family) = 600,000 social value. SROI = 6:1. For every 1 invested, 6 of social value created. Strong impact metric.
SROI methodology: (1) Map stakeholders affected. (2) Identify outcomes (positive and negative). (3) Value outcomes in financial terms (proxy values). (4) Establish counterfactual (what would have happened anyway). (5) Calculate SROI ratio. Used by impact investors, charities, social enterprises, government programmes. Strong SROI: 3:1+. Excellent: 5:1+. Below 1:1: programme destroying value. Always cite assumptions transparently - SROI calculations subjective without clear methodology.
Run it with sensible defaults
Using investment amount of 100,000, beneficiaries count of 200, lifetime value per beneficiary of 2,000, sroi multiplier of 1.5, the calculation works out to 6.00:1. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Investment Amount, Beneficiaries Count, Lifetime Value per Beneficiary, and SROI Multiplier — do not pull with equal force. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
How the math works
SROI = total social value (beneficiaries × value × multiplier) / investment.
Using this well
What this doesn't capture
Steady-rate math ignores real-world volatility. Actual returns are lumpy; sequence-of-returns risk matters most in drawdown; fees and taxes drag on compound growth; and behaviour changes in drawdowns can reduce outcomes below the projection. The number represents one scenario rather than a forecast.
££100,000 for 200 beneficiaries × ££2,000 × 1.5 = 6.00:1.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator computes the Social Return on Investment (SROI) ratio by dividing total social value by the initial investment amount. Total social value is calculated by multiplying the number of beneficiaries by the lifetime value attributed to each beneficiary, then applying an SROI multiplier that reflects contextual factors or outcome adjustments. The resulting ratio indicates the social value generated per unit of currency invested. The model assumes a linear relationship between these inputs and treats the multiplier as a constant adjustment factor. It does not account for timing of benefits, probability of outcomes, variation in value across beneficiary groups, programme costs beyond the initial investment, or changes in social value over time. Results should be interpreted as a snapshot based on the stated assumptions rather than a forecast.
References
Frequently Asked Questions
What's good SROI ratio?
How to value social outcomes?
SROI limitations?
SROI vs traditional ROI?
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