Estimate the true cost of poor wellbeing in your organisation - and the return you could achieve with evidence-based investment.
Enter your headcount, average salary and sector, and the calculator estimates the annual cost of poor wellbeing in your organisation across four lines: sickness absence, presenteeism, turnover and mental-health-related cost. It then models a suggested wellbeing investment and the projected annual return, using published UK benchmarks (including Deloitte's finding that well-targeted mental-health spend returns an average of £4.70 per £1, fourth edition, May 2024) alongside stated assumptions of our own. Example: a 100-person firm on average UK salaries typically sees a six-figure annual hidden cost. Free; results are emailed to you as a report.
Absenteeism: Days lost x daily salary cost (salary / 260 working days).
Presenteeism: our assumption, not a published figure. We model 44 days per employee per year worked at 33% reduced productivity, which nets out at about 14 equivalent working days lost. For context, Vitality's Britain's Healthiest Workplace study puts productivity already lost to ill health and presenteeism combined at roughly 38–50 days per employee per year, so our figure sits well below it.
Turnover: leavers x replacement cost, which we assume at 50% of annual salary. That is our assumption and it is not a published UK benchmark. CIPD's published median cost per hire is £1,500 for most employees and £2,000 for senior managers and directors, but that covers recruitment only, not lost output or handover (CIPD, Resourcing and talent planning report, September 2024).
Mental health: ONS recorded 148.8 million working days lost to sickness in the UK in 2025, and attributes 8.9% of absence occurrences to mental health conditions (ONS, Sickness absence in the UK labour market, released 1 May 2026). ONS does not publish a days-lost split by condition, so we apply the occurrence share to your absence cost. That is an approximation and it is likely to understate the true figure, because mental health absences tend to run longer than average.
ROI projection: Deloitte puts the average return at GBP 4.70 for every GBP 1 spent supporting workforce mental health, rising to GBP 6.30 for universal, organisation-wide interventions (Deloitte, Mental health and employers: the case for investment, fourth edition, May 2024). The 1% of payroll investment level is our own assumption, not Deloitte's. We also cap the saving shown above at 35% of your estimated total cost, because no intervention recovers the whole of it. In most cases that cap, rather than the Deloitte multiple, is what sets the figure you see.
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