What is employee wellbeing ROI? A framework for HR teams

Employee wellbeing ROI is the financial return an organisation gets from investing in employee health and wellbeing benefits, measured by comparing the cost of the benefit against the savings it generates in reduced sick leave, lower staff turnover, and improved productivity. For HR and benefits leaders, it's the calculation that turns "we should offer this" into a business case a finance director will sign off.

This isn't a vanity metric. Wellbeing spend competes for the same budget as every other line item in the business, and HR teams that can't quantify the return struggle to protect, let alone grow, that spend. This guide walks through the framework: what to measure, how to calculate it, and how to present it internally.

Why employee wellbeing ROI matters is important

Wellbeing budgets are under more scrutiny than they were two years ago. Finance teams want to see the same rigour applied to a wellbeing platform that they'd expect from any other investment: cost in, return out. HR teams that can show this get buy-in faster and keep their budget when belts tighten elsewhere. Teams that can't are the first line cut when savings are needed.

At the same time, the underlying cost pressures, sickness absence, staff turnover, presenteeism, haven't gone away. The business case exists; it just needs to be built properly.

The core employee wellbeing ROI formula

At its simplest, the calculation looks like this:

Wellbeing ROI = (Total savings generated − Cost of the benefit) ÷ Cost of the benefit × 100

"Savings generated" is the sum of three components most HR teams can realistically measure:

1. Reduced sick leave costs — fewer sick days taken, or fewer long-term absences
2. Reduced turnover costs — improved retention, fewer costly rehires
3. Productivity impact — less presenteeism (people at work but not functioning at full capacity) and fewer performance dips tied to unmanaged health conditions

Each of these can be estimated with data most HR teams already hold. The sections below break down how.

Calculating the cost of sick leave

Start with your organisation's average number of sick days per employee per year, and your average daily cost per employee (salary plus overhead, divided by working days).

Sick leave cost = Average sick days per employee × Average daily employee cost × Headcount

If a wellbeing benefit is targeted at a condition with a known absence pattern, such as menopause symptoms, fertility treatment, mental health, neuroinclusion-related burnout, look specifically at absence data for the affected group where you have it, rather than only the organisation-wide average. A benefit aimed at a specific health area should be judged against the cost it's actually addressing, not diluted across the whole workforce.

Calculating the cost of staff turnover

Turnover is usually the single largest number in the wellbeing ROI calculation, because replacing an employee costs far more than most HR teams initially estimate once recruitment, onboarding, lost productivity during ramp-up, and knowledge loss are all included. It can cost £30,000+ on average to replace a single employee.

A workable formula:

Turnover cost = (Recruitment cost + Onboarding cost + Lost productivity during ramp-up) × Number of leavers

If you can identify how many departures were linked to unmet health or wellbeing needs (exit interview data is the best source here) that subset gives you the most defensible number to attribute directly to a wellbeing intervention. Where that data doesn't exist yet, a conservative estimate (for example, assuming a benefit reduces turnover in the target group by a modest, stated percentage) is more credible to a finance audience than an unsupported large claim.

Calculating the productivity impact

This is the hardest of the three to measure precisely, and it's fine to say so in the business case. Presenteeism (working while unwell, distracted, or under-supported) is harder to quantify than absence, but it's often the larger cost.

A reasonable proxy: estimate the percentage of working time lost to an unmanaged health issue (self-reported surveys or manager input can inform this), then apply that percentage to the average employee's salary cost.

Productivity cost = Average salary cost × Estimated % productive time lost × Affected headcount

Where precise data isn't available, present this as a range rather than a single figure. A defensible range holds up better under finance scrutiny than a specific number with no methodology behind it.

Putting it together: a worked example

A mid-sized employer with 1,000 employees might see a proposed wellbeing benefit's costs and savings break down roughly like this:

The exact figures will vary by organisation, sector, and the specific health area a benefit targets — this table illustrates the shape of the calculation, not a number to quote directly.

Building the business case: a step-by-step approach

1. Pull your baseline data. Sickness absence rates, turnover rates, and exit interview themes for the past 12 months.
2. Identify the target population. Is the benefit for the whole workforce, or a specific group (for example, employees managing menopause, fertility treatment, or neurodivergent employees)? A targeted benefit needs targeted baseline data.
3. Calculate the three cost components. Sick leave, turnover, and productivity impact, using the formulas above.
4. Total the benefit cost. Include admin and rollout time, not just the provider fee.
5. Calculate ROI. Use the formula at the top of this guide.
6. Present a range, not a single number. Finance stakeholders respond better to a credible range with stated assumptions than an unqualified figure.
7. Revisit annually. ROI calculations improve as more internal data becomes available — treat the first year's figure as a baseline to refine, not a final answer.

Common mistakes HR teams make when calculating wellbeing ROI

• Using organisation-wide averages for a targeted benefit. If a benefit addresses a specific health area, measure against that group's data where possible, not the whole workforce.
• Ignoring presenteeism. Absence is easier to measure, but presenteeism is often the bigger cost — leaving it out understates the case.
• Presenting a single figure with no stated assumptions. A range with visible methodology survives finance scrutiny; an unexplained number doesn't.
• Calculating once and never revisiting. The first year's ROI estimate is usually the least accurate, because baseline data is thinnest. Each subsequent year sharpens it.

FAQs

What is employee wellbeing ROI? Employee wellbeing ROI is the financial return generated by an employee wellbeing benefit, calculated by comparing its cost against the savings it produces in reduced sick leave, lower staff turnover, and improved productivity.

How do you calculate employee wellbeing ROI? Subtract the cost of the wellbeing benefit from the total savings it generates (reduced sick leave costs, reduced turnover costs, and productivity gains), then divide by the benefit cost and multiply by 100 to get a percentage return.

What's included in the cost of staff turnover? The cost of staff turnover typically includes recruitment costs, onboarding costs, and lost productivity while a replacement employee reaches full capacity, multiplied by the number of employees who leave.

Why is presenteeism important in a wellbeing ROI calculation? Presenteeism, employees working while unwell or unsupported, is often a larger cost than absence but is harder to measure, so leaving it out of an ROI calculation tends to understate the true business case.

How often should HR teams recalculate wellbeing ROI? Wellbeing ROI should be recalculated annually, since baseline data on absence, turnover, and productivity typically becomes more complete and accurate each year a benefit is in place.