How do you calculate total field failure cost?

Multiply fleet units by cost per call by the annual failure rate, then add fixed dispatch overhead. Here: 500 x $320 x 12% + $4,000 = $23,200.

What is field failure cost per unit?

Divide total cost by fleet size. In the example, $23,200 across 500 machines is $46.40 per deployed unit per year — a clean number to compare against machine margin.

What counts as a good annual failure rate for vending machines?

Well-maintained modern machines often run 8-15% annual field-call incidence. Above 20% usually signals aging hardware, harsh siting, or a maintenance gap worth investigating.

Why include a fixed dispatch overhead?

Dispatch scheduling, call-center staffing, and truck standby exist whether or not a specific machine fails. In the example that fixed $4,000 adds $8 per unit on top of the $38.40 variable cost.

Field failure cost vs. preventive maintenance cost — which wins?

If a PM program costs less per unit than the failure cost it prevents — here $46.40/unit — it pays for itself. Model the reduced failure rate and re-run to see the crossover.

How can I reduce field failure cost per unit?

Cut the failure rate through PM and better siting, lower cost per call with remote diagnostics that avoid blind truck rolls, and spread fixed overhead across a larger fleet.

Vending, Kiosk & Self-Service Equipment calculator

Field Failure Cost Calculator

Field Failure Cost quantifies what breakdowns across a deployed vending and kiosk fleet cost you in a year, combining the price of each truck roll with how often machines fail plus your standing dispatch overhead. Service managers and route operators use it to justify preventive maintenance spend, choose between repair and replacement, and set service-level pricing for third-party locations. It matters because a single field service call on a self-service machine — with drive time, parts, and lost vend revenue — can dwarf the margin that machine earns in a month. Turning failure rate into a cost per deployed unit makes the reliability case in numbers a CFO will accept.

What this calculator does

Estimates the annual field failure cost of a deployed vending or kiosk fleet from unit count, per-call service cost, and failure incidence.
Use it to size warranty exposure and on-site maintenance budgets before signing a multi-site self-service equipment placement.
It computes total annual field failure cost, the per-unit cost across the fleet, and the split between variable repair cost and fixed dispatch overhead.

Formula used

Total field failure cost = fleet units x cost per service call x annual failure rate% + dispatch overhead
Cost per deployed unit = total field failure cost / fleet units

Inputs explained

Units in Installed Fleet:
Cost per Field Service Call:
Annual Failure Incidence:
Standing Dispatch Overhead:

How to use the result

Use it when budgeting field service, comparing machine models by reliability, or deciding whether a preventive maintenance program pays for itself.
It uses a single blended failure rate and one average call cost, so it won't capture a small population of chronic bad-actor machines that drive a disproportionate share of dispatches.

Current U.S. benchmarks

Global copper trades at $13,484 per tonne (IMF via FRED, May 2026), up 41.5% in a year, and U.S. industrial electricity averages 8.66 cents per kWh. Both feed electrified-hardware unit economics.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate total field failure cost? Multiply fleet units by cost per call by the annual failure rate, then add fixed dispatch overhead. Here: 500 x $320 x 12% + $4,000 = $23,200.
What is field failure cost per unit? Divide total cost by fleet size. In the example, $23,200 across 500 machines is $46.40 per deployed unit per year — a clean number to compare against machine margin.
What counts as a good annual failure rate for vending machines? Well-maintained modern machines often run 8-15% annual field-call incidence. Above 20% usually signals aging hardware, harsh siting, or a maintenance gap worth investigating.
Why include a fixed dispatch overhead? Dispatch scheduling, call-center staffing, and truck standby exist whether or not a specific machine fails. In the example that fixed $4,000 adds $8 per unit on top of the $38.40 variable cost.
Field failure cost vs. preventive maintenance cost — which wins? If a PM program costs less per unit than the failure cost it prevents — here $46.40/unit — it pays for itself. Model the reduced failure rate and re-run to see the crossover.

Last reviewed 2026-05-12.