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Preventive vs Breakdown Maintenance Cost Calculator

Estimates what unplanned breakdowns cost a small fleet each year and whether a preventive maintenance program would come out ahead.

Your numbers

Results update as you type.

Your estimate

Annual breakdown cost today...
Annual cost with a PM program...
Net annual savings...
Breakdowns avoided per year...

Estimates only. Assumptions are listed below, and you can change every input.

Most fleet owners know that a tow, a rush repair and a truck sitting idle for two days costs more than an oil change and an inspection. What they rarely have is a number. Without one, preventive maintenance looks like an expense you can postpone, and the breakdown bill lands as a surprise every single time. This calculator puts both sides on the same page so you can compare them for your own fleet, not a hypothetical one.

The estimate is simple arithmetic on figures you supply. It multiplies your fleet size by breakdowns per vehicle per year to get the number of unplanned failures, then prices each one at the repair cost plus the downtime cost you enter. It then applies the breakdown reduction you expect from preventive maintenance, adds your planned PM spend per vehicle, and reports the difference. Nothing is pulled from industry averages; if you change an input, the answer changes with it.

How to use this tool

  1. Enter your fleet size and count last year's unplanned breakdowns to get a per-vehicle rate.
  2. Fill in what a typical breakdown costs you in repairs and in downtime, then what you would spend on scheduled PM per vehicle.
  3. Adjust the expected reduction percentage until it reflects how many failures you believe a consistent schedule would prevent, and read the net savings.

What the math assumes

  • Every breakdown costs the same repair amount and the same downtime amount; real failures vary widely, so use your averages.
  • The breakdown reduction percentage is your estimate, not a published figure. The default of 60% is only a starting point to edit.
  • Preventive maintenance spend is treated as a flat annual amount per vehicle, whatever the vehicle type or age.
  • Breakdowns that still happen under a PM program cost the same as they do today.
  • Secondary effects such as resale value, fuel economy, warranty claims and driver retention are not included.

Frequently asked questions

What counts as downtime cost per breakdown?

Anything you pay or lose while the vehicle cannot work: idle driver wages, a rental replacement, missed or late jobs, and any penalties. If you do not track it, estimate one day of that vehicle's revenue and multiply by the days it is usually out.

Why is the net savings negative for my fleet?

It means your planned PM spend per vehicle is higher than the breakdown cost it would remove at the reduction you entered. Check whether the breakdown rate or the downtime cost is understated, or whether your PM budget includes items that are not really preventive.

How do I pick the breakdown reduction percentage?

Look at the causes of last year's failures. Those tied to fluids, belts, hoses, batteries, brakes and tires are the ones a schedule usually catches early; failures from accidents or sudden component defects are not. The share of the first group is a reasonable estimate.

Link to this toolhttps://fleettendr.com/tools/preventive-vs-breakdown-cost/

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