Whole-body vibration calculator
Calculate daily x, y and z exposure from frequency-weighted RMS readings and find the highest daily axis.
Enter your values
Check this tool fits your task
Enter x/y Wd-weighted and z Wk-weighted RMS readings BEFORE the axis multiplying factors. This tool applies 1.4 to x/y and 1 to z. Not a vibration-dose-value or shock/jolt assessment.
Your result
Enter your values, or try the example to see how it works.
Calculation breakdown
What to do next
Method and sources
For each axis: k × √[Σ(a² × hours) ÷ 8], with kx=ky=1.4 and kz=1. Compare the largest axis A(8). GB EAV 0.5 and ELV 1.15 m/s² A(8).
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
Four hours at x=0.4, y=0.2, z=0.6 m/s² before k-factors → highest daily axis z, A(8) 0.424 m/s².
The example button fills illustrative values. Where a scope confirmation is shown, check it yourself before calculating.
Method and references
For each axis: k × √[Σ(a² × hours) ÷ 8], with kx=ky=1.4 and kz=1. Compare the largest axis A(8). GB EAV 0.5 and ELV 1.15 m/s² A(8).
Enter x/y Wd-weighted and z Wk-weighted RMS readings BEFORE the axis multiplying factors. This tool applies 1.4 to x/y and 1 to z. Not a vibration-dose-value or shock/jolt assessment.
Common questions
Do I add the three axes together?
No. Daily exposure is calculated separately for each axis; this tool reports the highest.
What if the instrument already applied 1.4?
Do not enter that value here. Obtain the correctly frequency-weighted RMS readings before multiplying factors.
Can A(8) assess shocks and jolts fully?
No. They can require additional assessment, including an appropriate VDV method.
Public beta · Check the method and inputs with a competent reviewer before operational use.
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