How do you calculate patch repair cost?

Multiply the number of patches by the per-patch rate and the capture factor, then add the fixed cost. With 100 patches at $45 each, an 80% capture factor, and $250 fixed, the total is $3,850.

What does the capture factor represent in patch repair costing?

It scales the raw material-and-labor rate to the portion that is actually billable or effectively consumed — for example excluding warranty rework or shared crew time. At 80% it turns $4,500 of raw patch value into $3,600 of captured value.

How is the per-patch cost calculated?

Divide the total cost by the number of patches. In the example, $3,850 across 100 patches is $38.50 per patch, which already includes each patch's share of the $250 fixed setup.

When does patching cost more than a full reline?

Watch the per-patch figure and frequency: when the running total of patch campaigns over a lining's life approaches the price of a reline plus lost production, patching stops paying. This calculator gives you the per-campaign total to feed that comparison.

Why does the fixed cost matter so much on small jobs?

The fixed mobilization cost is spread across every patch, so on a 5-patch job the $250 dominates the per-piece cost, while on 100 patches it adds only $2.50 each. Small emergency patches are disproportionately expensive per piece.

What is a good per-patch cost for furnace refractory repair?

It varies widely with access, material, and downtime, but the useful benchmark is your own trend — a per-patch cost climbing campaign over campaign signals a lining nearing end of life and a reline decision looming.

Refractories, Furnace Linings & Foundry Consumables calculator

Patch Repair Cost Calculator

Patch Repair Cost totals what a batch of refractory patch repairs actually costs, combining the number of patches, the material-plus-labor rate per patch, a capture factor for the portion that is billable or effectively worked, and a fixed mobilization cost that applies once per job. Maintenance managers and refractory contractors use it to price hot-face patch campaigns on furnaces, ladles, and boilers, and to decide whether repeated patching still beats a full reline. Because a single fixed setup charge spreads across every patch, per-piece cost falls as the batch grows — this tool makes that break-even visible. It turns a pile of small gunning or troweling repairs into a defensible total and a per-patch figure.

What this calculator does

Patch Repair Cost totals what a batch of refractory patch repairs actually costs, combining the number of patches, the material-plus-labor rate per patch, a capture factor for the portion that is billable or effectively worked, and a fixed mobilization cost that applies once per job.
Use it when patch repair cost in refractories, furnace linings and foundry consumables is being put through a refractories, furnace linings and foundry consumables weighted-cost review.
It sums variable patch cost (quantity x rate x capture factor) with a one-time fixed cost and then divides the total by quantity for a per-patch figure.

Formula used

Patch Repair Cost cost = quantity × rate × capture factor + fixed cost
Per-unit patch repair cost = total cost ÷ quantity

Inputs explained

Number of patch repairs performed:
Refractory material and labor cost per patch:
Billable share of patch work (capture factor):
Fixed mobilization and setup cost:

How to use the result

Use it when quoting or budgeting a refractory patch campaign, or comparing accumulated patch spend against the cost of a full reline.
The capture factor is a single blended percentage; if some patches are far cheaper or costlier than others, a flat rate hides that spread and the per-piece figure will mislead.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The U.S. has 3,569 primary metal manufacturing establishments employing about 354,911 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate patch repair cost? Multiply the number of patches by the per-patch rate and the capture factor, then add the fixed cost. With 100 patches at $45 each, an 80% capture factor, and $250 fixed, the total is $3,850.
What does the capture factor represent in patch repair costing? It scales the raw material-and-labor rate to the portion that is actually billable or effectively consumed — for example excluding warranty rework or shared crew time. At 80% it turns $4,500 of raw patch value into $3,600 of captured value.
How is the per-patch cost calculated? Divide the total cost by the number of patches. In the example, $3,850 across 100 patches is $38.50 per patch, which already includes each patch's share of the $250 fixed setup.
When does patching cost more than a full reline? Watch the per-patch figure and frequency: when the running total of patch campaigns over a lining's life approaches the price of a reline plus lost production, patching stops paying. This calculator gives you the per-campaign total to feed that comparison.
Why does the fixed cost matter so much on small jobs? The fixed mobilization cost is spread across every patch, so on a 5-patch job the $250 dominates the per-piece cost, while on 100 patches it adds only $2.50 each. Small emergency patches are disproportionately expensive per piece.

Last reviewed 2026-05-12.