Work out as low as reasonably practicable cost instantly with clear inputs, formula shown and shareable results.
Demonstrating that risk is as low as reasonably practicable requires comparing the cost of a measure with its monetised safety benefit, statistical fatalities averted times the value of a prevented fatality. A measure must be implemented unless its cost is grossly disproportionate to the benefit, with the disproportion factor rising as the residual risk gets closer to intolerable.
Benefit
Benefit = statistical fatalities averted x value of a prevented fatality
ALARP test
Implement unless cost exceeds benefit x gross disproportion factor
Preliminary estimate only. ALARP demonstrations must be prepared by competent safety specialists in line with regulator guidance and accepted values.
Benefit = statistical fatalities averted x value of a prevented fatality. Demonstrating that risk is as low as reasonably practicable requires comparing the cost of a measure with its monetised safety benefit, statistical fatalities averted times the value of a prevented fatality.
Because the burden of proof falls on the duty holder. Equal cost and benefit is not enough to refuse a measure; the cost must be grossly disproportionate, and the factor rises with the severity of the residual risk.
This calculator takes 4 inputs: Statistical fatalities averted, Value of a prevented fatality, Cost of the mitigation, Gross disproportion factor. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.