How do you calculate drywall dryer energy cost?

Multiply boards dried by variable energy cost per board and by thermal efficiency, then add fixed overhead per run. For 100 boards at $45 each, 80% efficiency, and $250 overhead, the total is $3,850.

What is the energy cost per board in that example?

Dividing the $3,850 total by 100 boards gives $38.50 per board. That per-piece figure is the number to track run over run and against other board grades.

Why include fixed overhead separately?

Burner standby, recirculation fans, and minimum-fire energy don't scale with board count, so they're added as a flat $250 per run. In the example that fixed adjustment sits on top of $3,600 of variable burn.

How does thermal efficiency change dryer cost?

Here efficiency scales the variable burn, so the captured variable value is $3,600 at 80%. Make sure your per-board energy figure and this factor are defined consistently so a lower efficiency genuinely reflects more fuel, not less.

What drives high dryer energy cost in drywall?

Excess board water from a high water/stucco ratio, low dryer thermal efficiency, poor heat recovery, and short, frequent runs that spread fixed overhead thinly all push the per-board cost up.

How can I lower dryer energy per board?

Reduce free water by tightening the water/stucco ratio and foam use, recover exhaust heat, seal the dryer envelope, and run longer batches so the $250 fixed overhead is spread over more boards.

Gypsum, Drywall & Interior Panel Manufacturing calculator

Dryer Energy Cost Calculator

Dryer energy cost captures what it costs to drive free water out of green board in the multi-zone board dryer, the most energy-intensive step in drywall manufacturing. Plant managers and energy engineers use it to cost a run, benchmark gas burn against board throughput, and justify dryer upgrades. Because the dryer can account for the majority of a plant's thermal energy bill, the combination of per-board energy, thermal efficiency, and fixed overhead drives the true cost of every run. This calculator separates the variable burn from the fixed cost of firing the dryer.

What this calculator does

Estimate dryer energy cost for a board production run by combining boards dried, variable energy cost per board, dryer thermal efficiency, and fixed overhead.
Use it when building a board cost model and dryer fuel or gas is a significant line item that needs to be tied to board count and dryer efficiency.
It computes total dryer energy cost for a run by combining variable energy (boards times cost per board times thermal efficiency) with fixed overhead.

Formula used

Variable dryer cost = boards dried x variable energy cost per board x dryer thermal efficiency
Total dryer energy cost = variable dryer cost + fixed overhead per run

Inputs explained

Boards dried per run:
Variable energy cost per board:
Dryer thermal efficiency:
Fixed overhead per run:

How to use the result

Use it to cost a drying run, benchmark energy per board, or model the impact of a thermal efficiency change.
The thermal efficiency factor here scales variable energy as supplied; confirm it matches how your energy-per-board figure was measured to avoid double-counting losses.

Common questions

How do you calculate drywall dryer energy cost? Multiply boards dried by variable energy cost per board and by thermal efficiency, then add fixed overhead per run. For 100 boards at $45 each, 80% efficiency, and $250 overhead, the total is $3,850.
What is the energy cost per board in that example? Dividing the $3,850 total by 100 boards gives $38.50 per board. That per-piece figure is the number to track run over run and against other board grades.
Why include fixed overhead separately? Burner standby, recirculation fans, and minimum-fire energy don't scale with board count, so they're added as a flat $250 per run. In the example that fixed adjustment sits on top of $3,600 of variable burn.
How does thermal efficiency change dryer cost? Here efficiency scales the variable burn, so the captured variable value is $3,600 at 80%. Make sure your per-board energy figure and this factor are defined consistently so a lower efficiency genuinely reflects more fuel, not less.
What drives high dryer energy cost in drywall? Excess board water from a high water/stucco ratio, low dryer thermal efficiency, poor heat recovery, and short, frequent runs that spread fixed overhead thinly all push the per-board cost up.

Last reviewed 2026-05-12.