Home · Tools · Sick-day ROI calculator
Tool 1 of 8 — about 60 seconds

How fast does an air purifier pay itself back?

Enter your headcount, pick your sector, and see the annual absence saving, payback period and 5-year net. Numbers update as you type. Defaults use the latest ONS and CIPD figures.

Your inputs

Pick a sector preset to populate typical absence and sick-day cost for that industry, or override every field manually.

Default absence rates: CIPD 2024 Sickness Absence Report. UK average sick-day cost £146 (ONS 2024). Reduction figures based on peer-reviewed deployments — your mileage will vary by ventilation baseline, occupancy and seasonality.

Result
Based on the numbers on the left.
Payback period
Annual saving
5-year net
Year-by-year cumulative net
Year Saving Costs Cumulative
Get a quote based on these numbers →

How this calculation works

Plain English, so a non-finance reader can defend the number in a budget meeting.

The formula

Annual saving =
  Headcount
  × Avg sick days/person/yr
  × Cost per sick day
  × Reduction %

Payback (months) =
  Unit cost ÷ Annual saving × 12

Where the defaults come from

  • £146 per sick day — ONS Labour Productivity Q4 2024 (median earnings × employer NI + 0.6× revenue contribution for office roles).
  • 5.7 days/yr UK private, 9.9 NHS, 10.6 care — CIPD Sickness Absence Survey 2024.
  • 20% reduction — meta-analysis of HEPA H13 deployments in office and ward settings, normalised over a 12-month observation window.

What this calculator deliberately doesn't count

Presenteeism (people working at reduced effectiveness while ill) is typically 1.5–3× the cost of absenteeism but is much harder to measure honestly. Patient outcomes in NHS settings, recovered teaching hours in schools, and reputational benefit during a public-health event are all real but excluded. If your finance team will accept presenteeism, multiply the annual saving by 2.0–2.5 as a sense-check.

Send the result of this calculator and your room dimensions.

We'll come back with the specific Maxvac, Medicair or Light Progress configuration that hits those targets, priced in your currency, with a 30-day trial unit on the table.

Email sales@uvc-vtm.co.uk +44 (0)1462 473820