The Cost of Ergonomic Injuries: What the Data Says and How to Calculate Ergonomics ROI

What is the cost of ergonomic injuries to US employers?

The cost of ergonomic injuries runs to tens of billions of dollars a year, but the exact number depends on what is being counted. Ergonomic injuries are not a single category in national statistics. They show up under labels such as "overexertion," "repetitive motion" and "musculoskeletal disorders," each defined differently.

This post walks through the three most useful primary sources on the cost of ergonomic injuries, says exactly what each figure measures and which year it covers, and then shows how to turn them into an ROI estimate for your own site. If you already know which jobs worry you, ViveLab's video ergonomic assessment can give you a quick estimated REBA or RULA score to start the conversation.

What does the Liberty Mutual Workplace Safety Index measure?

The Liberty Mutual Workplace Safety Index ranks the top 10 causes of serious, nonfatal workplace injuries by direct cost to US businesses.

What it measures: Injuries that caused an employee to miss more than five days of work, ranked by workers' compensation costs, then scaled to a national total using National Academy of Social Insurance data. It combines Liberty Mutual's claims data with customized Bureau of Labor Statistics data.

Which year: The 2025 index reflects 2022 data. Liberty Mutual bases each index on data from three years prior so claim costs can develop (Liberty Mutual 2025 WSI PDF).

Headline figures (2025 index, 2022 data):

• Direct costs of the most disabling injuries: $58.78 billion.
• Top 10 causes: $50.87 billion, or 86.55 percent of the total (Liberty Mutual).

The causes most relevant to ergonomics:

Rank	Cause (Liberty Mutual description)	Direct cost	Share of total
1	Overexertion involving outside sources: lifting, pushing, pulling, holding, carrying or throwing objects	$13.70 billion	23.31%
5	Other exertions or bodily reactions (awkward postures): bending, reaching, twisting, climbing, crawling, kneeling, sitting, standing, walking, running	$3.90 billion	6.63%
9	Repetitive motions involving microtasks	$1.83 billion	3.12%

Source: Liberty Mutual 2025 WSI.

Added together, these three causes come to $19.43 billion, about 33 percent of the total. That sum is our own arithmetic, and it is only an approximation of the cost of ergonomic injuries. The categories describe the event that caused the injury, not the diagnosis, so some of these claims will not be classic MSDs and some MSDs will fall under other headings.

What it does not include: Indirect costs such as overtime, replacement workers, lost productivity and administrative time. Less serious injuries with five or fewer days away are also outside the index.

How many musculoskeletal disorders does BLS count?

The Bureau of Labor Statistics Survey of Occupational Injuries and Illnesses (SOII) counts cases, not dollars. It is the best national measure of how often MSDs happen.

What it measures: Employer-reported cases recorded under OSHA recordkeeping rules. Since 2021, BLS publishes detailed case data in two-year periods.

2021-2022 (released November 2023): Over the 2021-2022 period, there were 502,380 workplace musculoskeletal disorders in private industry that resulted in at least one day away from work, at an annualized incidence rate of 25.3 MSDs per 10,000 full-time equivalent workers. Across all cases with days away from work in that period, the median was 10 days away (BLS, 2021-2022).

2023-2024 (latest release): The current release does not headline an MSD count. It reports that over the two-year 2023-2024 period, the event category with the most cases involving days away, job restriction or transfer (DART) was overexertion, repetitive motion and bodily conditions, at 946,290 cases. Cases with days away from work had a median of 8 days (BLS, 2023-2024).

Two cautions when quoting BLS:

• The 946,290 figure is an event category and includes job restriction and transfer cases. It is not the same as the 502,380 MSD count, which uses the BLS definition of a musculoskeletal disorder and counts only cases with days away from work.
• Self-reported employer data undercounts conditions that develop slowly or that workers do not report.

What do OSHA's Safety Pays numbers add?

OSHA's Safety Pays program helps employers estimate what an injury costs their own business (OSHA Safety Pays).

What it measures: Average direct cost of lost-time workers' compensation claims by injury type, using National Council on Compensation Insurance data for policy years 2015-2017, plus an estimate of indirect costs (OSHA background).

How it handles indirect costs: Safety Pays applies a sliding-scale multiplier based on a Business Roundtable publication and a Stanford University study. OSHA describes the multipliers as general estimates based on limited research that will vary by employer.

Direct cost of the claim	Indirect cost ratio
$0 to $2,999	4.5
$3,000 to $4,999	1.6
$5,000 to $9,999	1.2
$10,000 or more	1.1

Source: OSHA Safety Pays background.

The indirect costs OSHA counts include wages for absences not covered by workers' compensation, time lost through work stoppage, supervisor and administrative time, lost productivity from rescheduling and new-employee learning curves, and repair or replacement costs.

One line from OSHA's estimator is worth putting in front of finance: the extent to which an employer pays direct costs depends on its insurance policy, but "the employer always pays the indirect costs" (OSHA estimator).

How do you calculate the cost of an ergonomic injury at your site?

Use your own claim data where you have it. National averages are a fallback.

Step 1. Direct cost. Total paid and reserved workers' compensation costs for the claim, from your carrier or third-party administrator.

Step 2. Indirect cost. Multiply the direct cost by an indirect ratio. You can use the Safety Pays sliding scale or your own estimate of overtime, temporary labor, supervisor time and lost output.

Step 3. Sales needed to cover it. Divide the total cost by your profit margin. This is the same logic the Safety Pays estimator uses to show how much extra revenue an injury consumes.

Illustrative example (hypothetical numbers): A shoulder strain claim with $20,000 in direct costs.

Item	Calculation	Amount
Direct cost	From claim file	$20,000
Indirect cost	$20,000 x 1.1 (Safety Pays scale for $10,000+)	$22,000
Total cost	Direct + indirect	$42,000
Sales to cover at 5% margin	$42,000 / 0.05	$840,000

The figures above are for illustration only. Replace them with your own.

How do you estimate ergonomics ROI?

ROI for an ergonomic fix is the cost you expect to avoid, compared with what the fix costs.

1. Pick the job. Use injury history and a risk assessment to choose a task with a clear problem. Our guide to choosing ergonomic assessment tools explains which methods suit which tasks.
2. Estimate the expected annual cost of doing nothing. Average number of related claims per year multiplied by the average total cost per claim (direct plus indirect).
3. Cost the fix. Equipment, installation, downtime and training.
4. Estimate the reduction. Be conservative. Use the change in risk score as a guide, not a guarantee.
5. Add non-injury benefits only where you can measure them, such as cycle time, quality defects or turnover in that job.

Simple payback = cost of fix / annual avoided cost.

If a $12,000 lift table is expected to prevent one claim like the example above every two years ($21,000 a year in avoided cost), payback is under seven months. Again, these are illustrative numbers. To check that a lift table actually fixes the lift, compare before-and-after results with the revised NIOSH lifting equation.

Is there research evidence that ergonomic interventions pay off?

Yes, with caveats. A systematic review by Tompa and colleagues identified 35 ergonomic intervention studies with economic analyses across nine industrial sectors. It found strong evidence for the financial merits of ergonomic interventions from a firm perspective in manufacturing and warehousing, moderate evidence in administrative support and health care, limited evidence in transportation and insufficient evidence elsewhere. The authors also noted that more than half of the studies had low-quality economic analyses (Tompa et al., IWH).

That is a fair summary of the field. The direction is clear in heavy-handling sectors, but you should build your own business case on your own data rather than quote a universal ROI multiple. Be wary of any single "every $1 returns $X" figure without a traceable source.

Why does the cost of musculoskeletal injuries stay high year after year?

The Liberty Mutual index notes that its top 10 causes have barely changed in 25 years, holding 235 of the 250 available spots over that period (Liberty Mutual 2025 WSI PDF). Handling objects has been a fixture.

OSHA puts it simply: the number and severity of MSDs from physical overexertion, and their associated costs, can be substantially reduced by applying ergonomic principles (OSHA). The bottleneck in cutting the cost of ergonomic injuries is usually not knowledge but the time to find and prioritize the right jobs.

Faster assessment helps there. Video-based tools such as ViveLab's AI posture analysis estimate posture scores from a phone recording, with processing done on the device, so you can screen more jobs before deciding where to spend. The scores are AI-assisted estimates and should be reviewed by a trained assessor. Our article on pose estimation accuracy in ergonomics explains what these tools can and cannot measure.

This post discusses costs, not clinical care. Workers with persistent pain should see a clinician.

Next steps

To put a number on the cost of ergonomic injuries at your own site, pull last year's claims for strains, sprains and repetitive motion injuries, and run the calculation above on the top three. Then record those jobs and get a first estimate with the AI posture analysis tool, and read how to build a workplace ergonomics program to turn the numbers into a plan.