How do you calculate moisture loss cost?

Multiply wet tonnage by material value per ton by the moisture shrink percentage, then add the dryer energy charge. For 40 tons at $185/ton with 18% shrink plus a $320 energy charge, that is 40 x 185 x 0.18 = $1,332 variable loss plus $320 = $1,652 total.

What is a good moisture shrink rate for kiln-dried lumber?

Green softwood commonly loses 15-30% weight drying to a 15-19% final moisture content, while hardwoods run higher. A shrink rate below roughly 15% usually means the stock arrived partly seasoned; above 25% suggests very green material and a heavier dryer burden.

Why include dryer energy in the moisture loss figure?

Removing water is the single largest energy demand on a kiln or paper dryer. Folding the $320 energy charge into the loss captures the full cost of moisture — the weight you can't sell plus the fuel you burned to lose it — which here is $41.30 per wet ton.

Moisture loss cost per ton vs total cost — which should I quote from?

Quote from the per-ton figure ($41.30/ton here) because it stays stable as batch size changes. Use the total ($1,652) for a specific run's P&L. The per-ton number is what you build into a price sheet.

Does this calculator account for over-drying?

No. It assumes you dry to target. Over-drying wastes extra fuel and can cause checking or brittleness in lumber and cockle in paper, all of which add cost this flat-rate model does not capture.

How can I lower moisture loss cost per wet ton?

Buy drier stock to cut the shrink percentage, improve dryer heat recovery to shrink the energy charge, and avoid over-drying past your target moisture content. Each directly reduces the $41.30-per-ton figure.

Wood & Paper Manufacturing calculator

Moisture Loss Calculator

Moisture loss is the value that evaporates out of your product on the kiln or dryer line — water you paid to buy, move and heat but can never sell. Kiln operators, pulp dryer supervisors and paper mill cost accountants use this metric to put a dollar figure on green-to-dry shrinkage plus the fuel it takes to drive that water off. Because wood, pulp and board are priced by weight, every point of moisture removed is weight you lose at the scale, so knowing the loss per wet ton tells you whether a drying schedule or a supplier's green moisture spec is quietly eroding margin.

What this calculator does

Estimates the dollar value of weight lost to evaporated moisture during lumber or pulp drying, plus the energy to drive it off.
A kiln supervisor uses it to quantify what shrink and fuel cost on a batch sold by finished weight.
It computes the total dollar cost of moisture and dryer energy for a drying batch, then breaks it down to a cost per wet ton dried.

Formula used

Moisture loss value = wet tonnage x value per ton x moisture shrink% + dryer energy charge
Loss per wet ton = total loss value / wet tonnage dried

Inputs explained

Wet tonnage sent to dryer:
Finished material value per ton:
Moisture shrink rate (wet basis):
Dryer energy charge for the batch:

How to use the result

Use it when quoting kiln-dried lumber, evaluating a green-moisture surcharge from a supplier, or comparing dryer schedules where shrinkage and fuel burn trade off.
It treats moisture shrink as a single flat percentage of gross value; it does not model non-linear drying curves, over-drying degrade, or moisture reabsorption after the dryer.

Current U.S. benchmarks

The producer price index for lumber and wood products stands at 280.994 (BLS, May 2026), up 4.2% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The producer price index for paperboard and containers stands at 276.831 (BLS, May 2026), up 8.8% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 13,899 wood product manufacturing establishments employing about 432,255 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate moisture loss cost? Multiply wet tonnage by material value per ton by the moisture shrink percentage, then add the dryer energy charge. For 40 tons at $185/ton with 18% shrink plus a $320 energy charge, that is 40 x 185 x 0.18 = $1,332 variable loss plus $320 = $1,652 total.
What is a good moisture shrink rate for kiln-dried lumber? Green softwood commonly loses 15-30% weight drying to a 15-19% final moisture content, while hardwoods run higher. A shrink rate below roughly 15% usually means the stock arrived partly seasoned; above 25% suggests very green material and a heavier dryer burden.
Why include dryer energy in the moisture loss figure? Removing water is the single largest energy demand on a kiln or paper dryer. Folding the $320 energy charge into the loss captures the full cost of moisture — the weight you can't sell plus the fuel you burned to lose it — which here is $41.30 per wet ton.
Moisture loss cost per ton vs total cost — which should I quote from? Quote from the per-ton figure ($41.30/ton here) because it stays stable as batch size changes. Use the total ($1,652) for a specific run's P&L. The per-ton number is what you build into a price sheet.
Does this calculator account for over-drying? No. It assumes you dry to target. Over-drying wastes extra fuel and can cause checking or brittleness in lumber and cockle in paper, all of which add cost this flat-rate model does not capture.

Last reviewed 2026-05-12.