Hand-arm vibration calculator
Combine actual trigger times and representative vibration magnitudes for the tools used during a day.
Enter your values
Check this tool fits your task
Use frequency-weighted vibration total values in m/s², not a single uncombined axis or a guess from tool power. The result depends on representative inputs and a complete task inventory.
Your result
Enter your values, or try the example to see how it works.
Calculation breakdown
What to do next
Method and sources
A(8) = √[Σ(a² × exposure hours) ÷ 8]. Exposure points = 16 × A(8)². GB EAV: 2.5 m/s² / 100 points; ELV: 5 m/s² / 400 points.
How to use this tool
- Check the scope and collect measured or verified input values.
- Enter values using the displayed units, then calculate.
- Read the result, calculation breakdown and next steps together.
Worked example
5 m/s² for 2 hours plus 2.5 m/s² for 2 hours → A(8) 2.80 m/s² and 125 exposure points, above the GB action value.
The example button fills illustrative values. Where a scope confirmation is shown, check it yourself before calculating.
Method and references
A(8) = √[Σ(a² × exposure hours) ÷ 8]. Exposure points = 16 × A(8)². GB EAV: 2.5 m/s² / 100 points; ELV: 5 m/s² / 400 points.
Use frequency-weighted vibration total values in m/s², not a single uncombined axis or a guess from tool power. The result depends on representative inputs and a complete task inventory.
- HSE: hand-arm exposure calculator and action/limit values ↗
- HSE L140: vibration measurement and exposure method ↗
Common questions
Do I enter the shift length?
Enter actual exposure time for each tool; include all vibrating activities during the day.
Can I use the manufacturer’s number directly?
Check that it represents your actual task and conditions; declared emission figures may not represent workplace exposure.
Is below 100 points risk-free?
No. Lower exposure does not establish no risk; review controls, input quality and individual circumstances.
Public beta · Check the method and inputs with a competent reviewer before operational use.
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