Hand Arm Vibration Points Calculator

Work out hand arm vibration points instantly with clear inputs, formula shown and shareable results.

About Hand Arm Vibration Points Calculator

The exposure points system makes hand-arm vibration additive across tools. Points accumulate at twice the square of magnitude per hour, so a 5 m/s² tool earns 50 points an hour. One hundred points is the daily exposure action value of 2.5 m/s² A(8) and four hundred points is the limit value of 5 m/s².

Formulas

Exposure points

Points per hour = 2 x magnitude²; daily points = points per hour x trigger time

Thresholds

100 points = action value; 400 points = limit value

Worked example

With the default values below, Hand Arm Vibration Points Calculator returns Daily exposure points of 100.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Tool vibration magnitudeminimum 0.01 m/s²: 5 m/s²
Trigger time per dayaccepts 0.01–24 h: 2 h

Results

Daily exposure points: 100.0
Points accumulated per hour: 50.0
Time to reach the action value: 2.00 h
Time to reach the limit value: 8.00 h

Step by step

1Values used
2Exposure points
3Thresholds
4Daily exposure points= 100.0
5Points accumulated per hour= 50.0
6Time to reach the action value= 2.00 h
7Time to reach the limit value= 8.00 h

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Preliminary estimate only. Use manufacturer or measured vibration data and have the assessment reviewed by a competent person under the vibration regulations.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Preliminary estimate only. Use manufacturer or measured vibration data and have the assessment reviewed by a competent person under the vibration regulations.

Frequently Asked Questions

How is the Hand Arm Vibration Points figure worked out?

Points per hour = 2 x magnitude²; daily points = points per hour x trigger time. The exposure points system makes hand-arm vibration additive across tools.

Why is points-based assessment easier?

Because a worker using three different tools cannot simply add their A(8) values. Points add directly, so a mixed day is assessed by summing the points from each tool.

What values do I need to enter?

This calculator takes 2 inputs: Tool vibration magnitude, Trigger time per day. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.