Why does the fixed cost raise the per-vehicle reserve?

The fixed warranty cost is spread across the vehicles under warranty. A small fleet carries a large share on every vehicle, while a large fleet dilutes the same cost across more units.

What repair cost should I enter?

The average cost of one claim, including parts and labor. If claim types differ widely, run a separate reserve for each class instead of blending them.

How is claim incidence defined here?

It is the share of vehicles expected to raise at least one claim in the period. Enter the percentage your service history supports, not the worst case.

What happens when vehicles under warranty is zero?

The per-vehicle rows stay blank because there is no fleet to divide by. The expected claim cost and the fixed cost remain, and entering a vehicle count brings the reserve per vehicle back.

Rail, Transit & Rolling Stock Manufacturing calculator

Warranty Reserve per Vehicle Calculator

Build the warranty reserve from the fleet size, the expected repair cost and the claim incidence, then spread the fixed program cost across the same vehicles. The headline is the reserve each vehicle carries.

What this calculator does

The warranty reserve a fleet carries per vehicle from claim cost, incidence and a fixed program cost, judged against a target.

Formula used

Expected claim cost per vehicle = repair cost per claim × claim incidence ÷ 100
Variable claim reserve = vehicles under warranty × expected claim cost per vehicle
Total warranty reserve = variable claim reserve + fixed warranty cost
Warranty reserve per vehicle = total warranty reserve ÷ vehicles under warranty; fixed cost per vehicle = fixed warranty cost ÷ vehicles under warranty
Reserve versus target = warranty reserve per vehicle − target reserve per vehicle

Inputs explained

Vehicles Under Warranty: Vehicles inside the warranty period for the reserve.
Repair Cost per Claim: Average parts and labor cost of one claim.
Claim Incidence: Share of vehicles expected to raise at least one claim.
Fixed Warranty Cost: Fleet-wide support cost that does not change with claims.
Target Reserve per Vehicle: Reserve policy limit the fleet must stay under.

How to use the result

Best suited to sizing a warranty provision before a bid, reviewing reserve policy at fleet renewal.
A systemic defect that hits the whole fleet at once is beyond a single incidence rate. The fixed cost is spread evenly, though a small fleet can carry a larger share.

Current U.S. benchmarks

Steel mill PPI stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. New factory orders are up 8.5% year over year (Census).
The U.S. has 11,691 transportation equipment establishments employing about 1,682,910 workers (Census County Business Patterns, 2023).

Common questions

Why does the fixed cost raise the per-vehicle reserve? The fixed warranty cost is spread across the vehicles under warranty. A small fleet carries a large share on every vehicle, while a large fleet dilutes the same cost across more units.
What repair cost should I enter? The average cost of one claim, including parts and labor. If claim types differ widely, run a separate reserve for each class instead of blending them.
How is claim incidence defined here? It is the share of vehicles expected to raise at least one claim in the period. Enter the percentage your service history supports, not the worst case.
What happens when vehicles under warranty is zero? The per-vehicle rows stay blank because there is no fleet to divide by. The expected claim cost and the fixed cost remain, and entering a vehicle count brings the reserve per vehicle back.

Last reviewed 2026-10-01.