What this calculator does
The metric is annual maintenance cost ÷ replacement asset value × 100. It gives cost a capital-value context when asset populations differ in size.
When to use it
Use it to track maintenance investment relative to installed value, not as a universal target or stand-alone replacement trigger.
Inputs and formula
RAV should represent what it would cost to replace the maintained asset base with equivalent capability, not original book value.
Worked example and interpretation
$240,000 annual maintenance cost on $4 million RAV equals 6%. Changes should be reviewed with reliability and asset-age drivers.
Practical notes and limitations
RAV estimates and cost classifications vary markedly by site. Keep the valuation convention stable and disclose capital project exclusions.