How do you calculate cost per board for drywall?

Multiply boards produced by variable cost per board and the overhead absorption rate to get the weighted variable cost, then add fixed overhead per run. With 100 boards at $45, an 80% rate and $250 fixed, the run carries $3,850 of weighted cost.

What is a good variable cost per board?

For standard 1/2 in. regular board it typically lands in the low-to-mid tens of dollars per panel depending on synthetic vs. natural gypsum, gas tariff and paper cost; the $45 default here reflects a heavier or premium panel. Benchmark against your own stucco and paper bills, not a published number.

Why does fixed overhead per run matter so much on short runs?

Fixed overhead ($250 in the example) is spread across however many boards you make. On a 100-board changeover run it adds $2.50 per board, but across a full 10,000-board production day it is a rounding error, which is why frequent SKU changeovers quietly inflate cost.

Cost per board vs. cost per thousand square feet (MSF) - which should I quote?

Customers buy drywall by MSF, so convert: cost per board divided by the board's area in MSF. Internally, cost per board is cleaner for line decisions; externally, MSF is the language of the price sheet.

How does overhead absorption rate change the result?

It scales the variable cost. Dropping the rate from 80% to 70% on the example lowers the weighted variable portion from $3,600 to $3,150, so the loaded run cost falls to $3,400 - a direct lever for testing under- or over-absorption.

Does this include scrap and wet-end waste?

Only if you have already baked scrap and edge trim into the variable cost per board. The calculator does not add a separate waste factor, so build expected yield loss into the per-board input.

Gypsum, Drywall & Interior Panel Manufacturing calculator

Cost Per Board Calculator

Cost Per Board is the fully-absorbed manufacturing cost of a single gypsum drywall panel once you fold variable consumption (stucco, paper, starch, gas) and a share of plant overhead into the run. Cost accountants and plant managers on board lines use it to set transfer prices, defend quotes against imported board, and decide whether a slow-moving SKU like 1/2 in. regular or 5/8 in. Type X is still earning its keep. Because gypsum board is a commodity sold by the thousand square feet, a few cents of drift per board compounds fast across a line running 30-40 million sq ft a month. This calculator weights the variable cost by an overhead absorption factor and then layers fixed run overhead on top.

What this calculator does

Estimate cost per board by combining boards produced, variable cost per board, overhead absorption rate, and fixed overhead for the run.
Use it when setting a board price or reviewing the cost stack to confirm that overhead absorption is not eroding margin on a high-volume run.
It computes the total weighted run cost by multiplying board volume, variable cost per board and the overhead absorption rate, then adding fixed overhead per run.

Formula used

Variable board cost = boards produced x variable cost per board x overhead absorption rate
Total run cost = variable board cost + fixed overhead per run

Inputs explained

Boards produced per run:
Variable cost per board:
Overhead absorption rate:
Fixed overhead per run:

How to use the result

Use it when costing a production run, validating a standard cost, or testing how an absorption-rate change moves the loaded cost before a price update.
The overhead absorption rate here acts as a multiplier on variable cost, so it models a burden-on-variable scheme rather than a true machine-hour or square-foot absorption base; reconcile against your GL allocation before quoting.

Common questions

How do you calculate cost per board for drywall? Multiply boards produced by variable cost per board and the overhead absorption rate to get the weighted variable cost, then add fixed overhead per run. With 100 boards at $45, an 80% rate and $250 fixed, the run carries $3,850 of weighted cost.
What is a good variable cost per board? For standard 1/2 in. regular board it typically lands in the low-to-mid tens of dollars per panel depending on synthetic vs. natural gypsum, gas tariff and paper cost; the $45 default here reflects a heavier or premium panel. Benchmark against your own stucco and paper bills, not a published number.
Why does fixed overhead per run matter so much on short runs? Fixed overhead ($250 in the example) is spread across however many boards you make. On a 100-board changeover run it adds $2.50 per board, but across a full 10,000-board production day it is a rounding error, which is why frequent SKU changeovers quietly inflate cost.
Cost per board vs. cost per thousand square feet (MSF) - which should I quote? Customers buy drywall by MSF, so convert: cost per board divided by the board's area in MSF. Internally, cost per board is cleaner for line decisions; externally, MSF is the language of the price sheet.
How does overhead absorption rate change the result? It scales the variable cost. Dropping the rate from 80% to 70% on the example lowers the weighted variable portion from $3,600 to $3,150, so the loaded run cost falls to $3,400 - a direct lever for testing under- or over-absorption.

Last reviewed 2026-05-12.