Free Tool · Hand-Arm Vibration Planning
HAVS Exposure Calculator: Plan Safe Tool Use Time
Select the tool type closest to what is being used to see typical exposure action value (EAV) and exposure limit value (ELV) trigger times. These are planning estimates based on common published vibration magnitudes – always use the manufacturer’s declared vibration figure for your exact tool and model for a precise calculation.
Heavy Breaker or Hammer Drill
At a typical vibration magnitude around 9 m/s², the exposure action value is often reached in as little as 30 minutes of daily trigger time, with the exposure limit value reached around 2 hours.
Relevant standards:
Angle Grinder
At around 5 m/s², the exposure action value is typically reached around 1 hour of daily use, with the limit value reached around 4 hours.
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Impact Wrench
At around 6.5 m/s², the exposure action value is typically reached around 35 minutes of daily use, with the limit value around 2.5 hours.
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Chainsaw
At around 6 m/s², the exposure action value is typically reached around 45 minutes of daily use, with the limit value around 3 hours.
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Orbital or Random Orbit Sander
At around 3.5 m/s², the exposure action value is typically reached around 2 hours of daily use, with the limit value around a full 8-hour shift.
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Light Hand-Held Grinder for Finishing Work
At around 2.5 m/s², roughly the exposure action value threshold itself, the action value may be reached around 4 hours of daily use, with the limit value bordering a full shift.
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Pedestrian-Operated Plate Compactor
At around 4 m/s², the exposure action value is typically reached around 1.5 hours of daily use, with the limit value around 6 hours.
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Strimmer or Brushcutter
At around 4.5 m/s², the exposure action value is typically reached around 1.2 hours of daily use, with the limit value around 5 hours.
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How to Use This Tool
Select the tool category closest to what is actually being used, then treat the resulting trigger times as a starting point for rotating workers between vibrating and non-vibrating tasks through the day. Where several vibrating tools are used across a shift, exposure from each must be combined, not assessed in isolation.
Why This Is a Planning Estimate, Not a Certified Calculation
Actual vibration magnitude varies significantly between makes, models, tool condition and how a tool is used. These figures are general planning estimates based on commonly published magnitudes for each tool category. A certified hand-arm vibration exposure calculation should use the manufacturer’s declared triaxial vibration value for the specific tool and combine it with actual measured daily trigger time.
Frequently Asked Questions
What is the exposure action value (EAV)?
The EAV is the daily vibration exposure level at which employers must take action to control exposure, such as health surveillance and additional controls, commonly set at 2.5 m/s² A(8).
What is the exposure limit value (ELV)?
The ELV is the maximum daily vibration exposure that should not be exceeded, commonly set at 5 m/s² A(8). Exposure above this level should not occur under normal circumstances.
Does a worn or poorly maintained tool increase vibration?
Yes. Worn bearings, unbalanced blades or damaged anti-vibration mountings can significantly increase the vibration magnitude compared to the manufacturer’s stated figure for a well-maintained tool.
Do I need to combine exposure from multiple tools?
Yes. If a worker uses several vibrating tools across a shift, the exposure points from each tool and duration combination are added together to reach total daily exposure.
Can gloves reduce hand-arm vibration exposure?
Anti-vibration gloves may provide some benefit for certain frequencies but should never be relied on as the primary control. Reducing trigger time, tool selection and maintenance are far more effective controls.
Explore the full EN Standards Library for every standard referenced above, or read real Field Stories showing what happens when selection goes wrong.