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Maintenance Cost Per Unit Calculator

Work out maintenance cost per unit instantly with clear inputs, formula shown and shareable results.

About Maintenance Cost Per Unit Calculator

Maintenance cost per unit distributes total maintenance spend over output. Two benchmark ratios matter alongside it: maintenance as a percentage of replacement asset value, where 2-3% is typical and under 2% indicates good practice, and the preventive-to-reactive split, where mature operations run 70:30 or better.

Formulas

Maintenance cost per unit

Cost per unit = total maintenance cost / units produced

Asset ratio

Maintenance % of RAV = maintenance cost x 100 / replacement asset value

Worked example

With the default values below, Maintenance Cost Per Unit Calculator returns Maintenance Cost Per Unit of $2.6042. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total Maintenance Costminimum 0 per year
1,250,000 per year
Units Producedminimum 0.01 per year
480,000 per year
Preventive Share Of Spendaccepts 0–100 %
55 %
Replacement Asset Valueminimum 0.01
25,000,000

Results

Maintenance Cost Per Unit
$2.6042
Preventive Maintenance Spend
$687,500.00
Reactive And Breakdown Spend
$562,500.00
Maintenance As % Of Asset Value
5.000%

Step by step

  1. 1Values used
  2. 2Maintenance cost per unit
  3. 3Asset ratio
  4. 4Maintenance Cost Per Unit= 2.6042
  5. 5Preventive Maintenance Spend= 687,500.00
  6. 6Reactive And Breakdown Spend= 562,500.00
  7. 7Maintenance As % Of Asset Value= 5.000

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

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

Frequently Asked Questions

Is lower maintenance spend always better?

No. Cutting preventive maintenance lowers spend for a year or two, then breakdowns, scrap and downtime cost far more. Judge spend against availability and total cost of ownership.

Why measure against replacement asset value?

It normalises for plant size and age, letting you benchmark against other sites and industries in a way that absolute spend cannot.

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