Return to Work Calculator
Modified duty parameters from injury and job demands.
About this calculator
This calculator compares a worker's functional capacity evaluation (FCE) result against the physical demand level of their job to help occupational health providers and employers plan a return-to-work pathway after injury or illness. The job demand levels used here — sedentary (occasional lifting under 10 lbs), light (10-20 lbs), medium (20-50 lbs), and heavy (50-100 lbs) — follow the physical demand classification originally developed by the US Department of Labor for the Dictionary of Occupational Titles and still widely used in vocational rehabilitation and disability evaluation today (via the Selected Characteristics of Occupations reference and its successors). The calculator translates each demand level into an approximate functional-capacity threshold a worker needs to meet for unrestricted full duty, then compares the worker's actual functional capacity against that threshold to generate a Recommendation (Not Ready, Modified Duty, or Full Duty) along with practical restrictions — a lifting limit scaled to both the worker's functional capacity AND the job's own DOL weight class (so the same functional capacity score yields a different recommended limit on a sedentary vs. a heavy job), plus a maximum daily hours figure — a case manager can use as a starting point for a written modified-duty plan.
The chronicity risk estimate reflects a genuinely important, well-documented pattern in occupational medicine: workers who are off work for extended periods, particularly beyond about 6-12 weeks, have measurably lower rates of ever returning to work, which is why time off work, pain level, and low functional capacity are all treated as risk factors here rather than time off work alone. This calculator's specific formulas for the functional-capacity thresholds, weeks-to-full-duty estimate, and chronicity risk score are this tool's own decision-support model, not a validated clinical instrument or a specific published guideline — it's meant to structure a conversation between the worker, employer, and treating clinician, not to replace an individualized functional capacity evaluation or a physician's return-to-work determination.
Inputs
Results
Recommendation
Full Duty
How to Use This Calculator
- Enter functional capacity evaluation result (%), job demand level (sedentary to heavy), and days off work.
- Enter current pain level (0-10 numeric rating scale).
- Read the return-to-work Recommendation: Not Ready, Modified Duty, or Full Duty.
- Review estimated return-to-work timeline based on functional capacity and job demands.
- Use results to develop a phased return-to-work plan with gradual demand escalation.
What each input means
- Functional capacity (%)
- Functional capacity evaluation result (0-100%).
- Job demand level
- US Dept. of Labor physical demand classification for the job.
- Days off work
- Number of days absent from work due to injury.
- Pain level (0-10)
- Current pain level on numeric rating scale.
What each result means
- Recommendation
- Not Ready, Modified Duty, or Full Duty.
- Full Duty Ready
- Whether functional capacity meets the job's physical demands.
- Modified duty capacity (%)
- Percentage of job demands the worker can perform.
- Est. weeks to full duty
- Estimated weeks until full duty return.
- Chronicity risk (0-100)
- Risk of injury becoming chronic/long-term disability.
- Max hours per day
- Recommended maximum work hours per day.
- Lifting Restriction
- Scaled to functional capacity AND the job's own DOL weight class (sedentary up to 10 lbs, light up to 20 lbs, medium up to 50 lbs, heavy up to 100 lbs) — the same functional capacity produces a different lifting limit on a sedentary vs. a heavy job.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersFunctional capacity (%) = 70, Job demand level (1-4) = 2, Days off work = 30, Pain level (0-10) = 3 = 4 input(s) provided
- Calculate RecommendationRecommendation = Full Duty if Functional Capacity ≥ Required Capacity, else Modified Duty or Not ReadyFull Duty = Full Duty
- Calculate Full duty readyFull duty readyYes = Yes
- Calculate Modified duty capacityModified duty capacity100 = 100%
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Where do the sedentary/light/medium/heavy job demand categories come from?
These are the physical demand levels originally established by the US Department of Labor for the Dictionary of Occupational Titles, still widely used today in vocational rehabilitation, disability evaluation, and workers' compensation case management (via the Selected Characteristics of Occupations reference and its successors). Sedentary work involves occasional lifting under 10 lbs, light work 10-20 lbs, medium work 20-50 lbs, and heavy work 50-100 lbs — a real, standardized classification rather than something specific to this calculator.
Is this calculator's Recommendation a medical or legal determination?
No — this is a decision-support estimate meant to structure a conversation between the worker, employer, and treating clinician, not a validated clinical instrument, a legal determination, or a substitute for an individualized functional capacity evaluation. The actual return-to-work decision, especially anything involving workers' compensation, ADA accommodation, or FMLA, should be made by the treating physician and, where applicable, in consultation with HR/legal counsel and the worker.
Why does time off work increase the chronicity risk score, not just injury severity?
This reflects a well-documented pattern in occupational medicine research: the longer someone stays off work after an injury, the lower their statistical likelihood of ever fully returning, independent of the injury's initial severity — a phenomenon sometimes summarized as extended time off work becoming its own risk factor for long-term disability. That's why this calculator weights days off work as a genuine risk driver alongside pain level and functional capacity, rather than treating chronicity risk as purely a function of how bad the original injury was.
What should I do if the calculator recommends Modified Duty?
Modified Duty means the worker's functional capacity meets at least 60% of the job's estimated physical demands but not the full requirement, so this is meant as a starting point for discussing a phased return plan — reduced hours, lighter tasks, or temporary reassignment — with the treating clinician and the employer, not as a final work assignment. The specific accommodations should come from the worker's actual functional capacity evaluation and the employer's real available modified-duty options, which this general estimate can't know.
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