Kiln Drying Time Estimator
Drying lumber too fast can cause checking and warp; too slow wastes kiln capacity. Enter your lumber thickness, species drying category, and starting/target moisture content to estimate total kiln time.
About this calculator
Estimate the time needed to kiln dry rough-sawn lumber to a target moisture content based on species drying rate, thickness, and starting moisture.
Frequently Asked Questions
Is this an exact schedule for a kiln operator?
No, this is a rough planning estimate. Professional kiln schedules account for species-specific drying curves, humidity control stages, and equalization periods.
Why does thickness affect drying time so much?
Moisture must travel further to escape thicker boards, and drying time increases roughly with the square (or more) of thickness, not linearly.
What moisture content should furniture-grade lumber reach?
Most interior furniture lumber should be dried to 6-8% moisture content, matching typical indoor equilibrium moisture content.