How do you calculate good brick count for a furnace reline?

Multiply bricks laid per cycle by available cycles to get gross capacity, then multiply by uptime and yield. With 4 bricks/cycle x 480 cycles = 1,920 gross, at 90% uptime and 97% yield you land on about 1,676 good bricks placed.

What is a good placement yield for refractory bricklaying?

On hot-face straight courses a seasoned gang runs 97-99% first-pass yield. Heavy shaped work, tight radius arches, or damp mortar conditions can pull it below 95%, which at 480 cycles quietly costs you dozens of bricks.

Why is good capacity lower than gross capacity?

Gross assumes every cycle runs at full rate with zero rejects. Real relines lose time to scaffold moves, mortar batching, and inspection (uptime), and lose bricks to chips and misfits (yield). Here that is 192 bricks to uptime and about 52 to yield.

How many spare bricks should I order on top of the count?

Add a cutting and breakage allowance on top of the good count, typically 3-5% for straights and up to 10% for complex shapes. The yield loss figure here (about 52 bricks) is a floor, not the full contingency.

Brick count vs tonnage for ordering refractories?

Count drives labor and scheduling; tonnage drives freight and kiln logistics. Convert count to tonnage using the per-brick mass of the specific shape and quality, since a 9-inch straight and an insulating firebrick differ hugely in weight.

Does uptime include mortar cure or just laying time?

Uptime here reflects only the productive laying window within available cycles. Cure and dryout are separate schedule items; model those with the Cure Time and Dryout Time calculators so you do not double-count the outage.

Refractories, Furnace Linings & Foundry Consumables calculator

Brick Count Calculator

The Brick Count metric tells a refractory crew how many sound, in-service bricks a furnace or ladle reline will actually deliver once downtime and placement rejects are subtracted from the theoretical total. Reline foremen, bricklayer gangs, and maintenance planners use it to size brick orders, schedule shutdown windows, and avoid mid-job material stockouts. It matters because a hot-face shortfall of even a few percent can stall a reline and push a furnace's return-to-heat by a full shift. Getting the good-count right up front is the difference between a clean campaign start and an emergency air-freight order of shapes.

What this calculator does

The Brick Count metric tells a refractory crew how many sound, in-service bricks a furnace or ladle reline will actually deliver once downtime and placement rejects are subtracted from the theoretical total.
Use it when brick count in refractories, furnace linings and foundry consumables is being asked to take on more work and you need to know if there is room.
It computes the number of good refractory bricks placed by multiplying bricks per cycle by available cycles, then de-rating for crew uptime and first-pass placement yield.

Formula used

Gross brick count capacity = units per cycle × available cycles
Good capacity = gross capacity × uptime × yield

Inputs explained

Refractory bricks laid per install cycle:
Available brick-laying cycles in the campaign:
Crew and equipment uptime during relining:
First-pass brick placement yield (no cracks or rejects):

How to use the result

Use it when planning a furnace, ladle, or kiln reline to convert a nominal laying rate into a realistic good-brick count for ordering and scheduling.
It assumes a constant per-cycle laying rate and ignores arch, key, or shaped bricks that lay far slower than straights, plus extra cutting waste on tapered courses.

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 good brick count for a furnace reline? Multiply bricks laid per cycle by available cycles to get gross capacity, then multiply by uptime and yield. With 4 bricks/cycle x 480 cycles = 1,920 gross, at 90% uptime and 97% yield you land on about 1,676 good bricks placed.
What is a good placement yield for refractory bricklaying? On hot-face straight courses a seasoned gang runs 97-99% first-pass yield. Heavy shaped work, tight radius arches, or damp mortar conditions can pull it below 95%, which at 480 cycles quietly costs you dozens of bricks.
Why is good capacity lower than gross capacity? Gross assumes every cycle runs at full rate with zero rejects. Real relines lose time to scaffold moves, mortar batching, and inspection (uptime), and lose bricks to chips and misfits (yield). Here that is 192 bricks to uptime and about 52 to yield.
How many spare bricks should I order on top of the count? Add a cutting and breakage allowance on top of the good count, typically 3-5% for straights and up to 10% for complex shapes. The yield loss figure here (about 52 bricks) is a floor, not the full contingency.
Brick count vs tonnage for ordering refractories? Count drives labor and scheduling; tonnage drives freight and kiln logistics. Convert count to tonnage using the per-brick mass of the specific shape and quality, since a 9-inch straight and an insulating firebrick differ hugely in weight.

Last reviewed 2026-05-12.