Ergonomic Risk Assessment Calculator
Calculate RULA/REBA-inspired ergonomic risk scores and strain index from workplace posture and force data.
Inputs
Results
RULA Score (1-7)
4.5
Risk Level (1=Low, 4=High)
3
REBA Score12
Strain Index20.3
Strain Index Hazardous1
Action Priority (1=Immediate)2
How to Use This Calculator
- Enter task force requirements (lbs or N), frequency of exertion (per minute), and task duration (hours).
- Enter posture assessment scores for back, shoulders, and wrists.
- Read composite ergonomic risk score and RULA/REBA action level.
- Review the highest-scoring body region to prioritize engineering controls.
- Action levels 3-4 require immediate investigation and engineering or administrative controls.
How the result changes with Task Duration (hours/day)
| Task Duration (hours/day) | RULA Score (1-7) | Risk Level (1=Low, 4=High) |
|---|---|---|
| 1.65 | 3 | 2 |
| 4.52 | 4.5 | 3 |
| 7.98 | 6 | 3 |
| 11 | 6 | 3 |
What each input means
- Posture Score
- 1=Neutral, 5=Extreme deviation from neutral posture.
- Force Level
- 1=Light (<2 lbs), 5=Heavy (>20 lbs).
- Repetition Level
- 1=Infrequent, 5=Constant high-frequency repetition.
- Task Duration (hours/day)
- Hours per day performing this task.
- Vibration Exposure
- 1 if task involves vibrating tools, 0 otherwise.
- Contact Stress
- 1 if hard edges press against body, 0 otherwise.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersPosture Score = 3, Force Level = 3, Repetition Level = 3, Task Duration (hours/day) = 6 = 6 input(s) provided
- Calculate RULA ScoreRULA Score4.5 = 4.5
- Calculate Risk Level3 = 3
- Calculate REBA ScoreREBA Score12 = 12
- Calculate Strain IndexStrain Index20.3 = 20.3
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