Benchmarked event RoI calculator.
See the measurable return on your next internal or external event, benchmarked by sector, and opportunity cost. Zirstar's calculator helps inform any internal or external event spend.
£2,000 → £78,000Arrangements cost → business won
January 2025 roundtable, City of London. £2,000 of arrangements brought in £78,000 of new business.
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Zirstar RoI calculator
Team compositionAudience and pipeline
Total team: 12 · Total employment cost: £480,000
Per tier, derived from the figures above and editable. Changing a figure above or the sector refills the table.
| Tier | Salary | Turnover | Replacement |
|---|---|---|---|
| Executives / directors | £ | % | % |
| Managers | £ | % | % |
| Juniors / associates | £ | % | % |
Event investment
Zirstar fee: £1,250 or 15% of event value, whichever is greater.
Your context optional
| Sector | Blended cost | Turnover | Replacement |
|---|---|---|---|
| Default | £40,000 | 15% | 100% |
| Professional services | £45,000 | 18% | 100% |
| Technology / SaaS | £55,000 | 20% | 120% |
| Financial services | £50,000 | 16% | 130% |
| Manufacturing / industrial | £35,000 | 11% | 75% |
| Media / creative | £38,000 | 22% | 90% |
| Healthcare / pharma | £42,000 | 14% | 110% |
Your RoI
Total investment: £4,250
Value breakdown
Same spend per head, different returns
Value breakdown
Same spend, different channels
Methodology and sources
Retention: Models the probability of preventing voluntary leavers. Of your expected leavers (headcount × turnover rate), research suggests well-designed offsites reduce turnover intent by ~17% (Gallup, 2023; SHRM employee engagement meta-analyses). Savings are scaled by your replacement cost percentage, per tier.
Collaboration: Estimates productivity gains from improved team cohesion. Cross-functional collaboration improvements of 1–2% of total employment cost are consistently reported in workplace research (McKinsey, 2023; Deloitte Human Capital Trends). We apply the conservative end at 1%.
Wellbeing: Applies a conservative 0.4% of employment cost: presenteeism-related losses are estimated at 5% of employment cost, of which a well-designed event is assumed to recover 8%, drawing on Deloitte (2022) on the returns from employer wellbeing interventions.
Tiers: Executives, managers and juniors are weighted separately for salary, turnover and replacement cost, derived from the sector figures. Salary ratios follow ONS ASHE 2025; turnover ratios follow Mercer's 2025 turnover survey (executive attrition well below front-line); replacement ratios follow Center for American Progress and Gallup findings that replacement cost rises steeply with seniority. The weights are normalised so a typical 1 / 3 / 8 mix reproduces the sector-average result.
Spend comparison: Pay increase RoI (0.4x) reflects diminishing returns on salary uplift beyond market rate (WorldatWork, 2023). Perks RoI (0.8x) based on SHRM benefits survey data showing low utilisation rates for standard perks. Technology RoI (2.5x) drawn from McKinsey Digital productivity benchmarks for collaboration tooling. All shown as recurring annual costs versus a one-time event investment.
Pipeline: Measures the incremental qualified pipeline generated by in-person engagement versus digital-only. Research consistently shows face-to-face interactions improve lead-to-opportunity conversion by 25–50% (Freeman/EventTrack, 2023; CEIR industry benchmarks). Uplift multipliers are calibrated by event format, with high-intent formats (dinners, exhibitions) at the upper end. Pipeline is shown for context and is not counted in the RoI.
Conversion: Captures additional closed revenue from the enhanced conversion rates at each funnel stage. The compounding effect of improved lead, opportunity, and close rates reflects Bain & Company findings that relationship-driven selling shortens qualification and increases win rates.
Cycle savings: Models the cash-flow benefit of faster deal closure. B2B sales cycle research (Gartner, 2023; CSO Insights) shows that in-person relationship building can compress cycles by 15–30%. We apply a conservative 5% of deal value to the time-value saving.
Channel comparison: Digital advertising RoI (2.5–4x) based on aggregate Google/Meta benchmarks for B2B campaigns. Marketing automation RoI (2–3x) from Forrester and HubSpot B2B marketing studies. Sponsorship RoI (1.5–2.5x) from IEG/Sponsorship Research International data, reflecting awareness-only attribution. In-person event RoI is calculated dynamically above.
Benefit decay (3-year projection): Research shows that event-driven gains (whether in engagement, relationships, or pipeline momentum) decline to ~55% at 12 months and ~30% at 24 months without reinforcement (Saks & Belcourt, 2006; Ebbinghaus forgetting curve). Year 1 is shown at full strength; years 2–3 are discounted accordingly.
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