Skip to content
Open calculators

Wood Equilibrium Moisture Content Calculator

Estimate wood equilibrium moisture content from air conditions and compare it with a measured wood moisture content.

Prefilled values are examples. Replace them with measurements and current costs for your project.

Inputs

Measured MC and air conditions

Range: at least 0 dry basis, %

Enter the current measured wood MC on a dry-mass basis. The calculator compares it with the air-condition EMC; it does not predict drying time.

Range: 30–210 °F

Enter air temperature from 30°F through 210°F, the temperature range tabulated in the cited USDA Wood Handbook chapter.

Range: 0–100 %

Enter relative humidity from 0% through 100%. Use the surrounding air condition, not the wood moisture content.

Result

Measured MC minus EMC
0.75 percentage points
Estimated equilibrium moisture content (dry basis)
9.25% MC
Measured moisture content is above the calculated EMC.

Formula

Estimated equilibrium moisture content (dry basis)
—
Measured MC minus EMC
—

Related calculators

Results are planning aids based on the inputs and assumptions shown. Verify dimensions, stock sizes, hardware clearances, kerf, and current prices against your project before cutting or quoting.