In the wood industry, understanding the difference between gross and net board foot measurements is essential to ensure accurate purchasing and pricing of kiln-dried lumber. Let’s break down what gross and net tallies mean, how shrinkage plays a role, and the conversions you need to make informed decisions.
Net tally represents the actual board footage measured after the kiln drying process. Since kiln drying removes moisture from the wood, it also reduces the overall volume. This is the measurement buyers typically care about when purchasing kiln-dried lumber, as it reflects what you’re getting after shrinkage.
Gross tally refers to the board footage measured before the wood undergoes kiln drying. It’s sometimes referred to as “green tally.” Because wood shrinks as it dries, purchasing based on gross tally means you’ll receive fewer board feet after drying—typically around 7% less.
When kiln-dried lumber is sold on a gross or green tally basis, buyers should account for approximately 7% shrinkage due to the drying process. This reduction can significantly impact both board footage and price if not properly accounted for.
Here’s how to easily convert between gross and net board footage or prices:
1. Net Board Footage = Gross Board Footage x 0.93
Since kiln drying typically results in a 7% reduction, multiplying gross board footage by 0.93 gives you the net tally.
2. Net Board Foot Price = Gross Board Foot Price / 0.93
To calculate the equivalent price for the reduced net tally, divide the gross price by 0.93.
3. Gross Board Footage = Net Board Footage / 0.93
If you have the net board footage and need to determine the original gross measurement, divide by 0.93.
4. Gross Board Foot Price = Net Board Foot Price x 0.93
To determine the original gross board foot price, multiply the net price by 0.93.
Purchasing on a gross tally basis can leave you with less material than expected if you’re not accounting for shrinkage. By using these simple formulas, you can:
Ensure accurate pricing and avoid paying more than expected.
Calculate the actual amount of wood you’ll receive post-drying.
Make smarter, more informed purchasing decisions.
Whether you’re buying or manufacturing wood products, knowing the difference between gross and net board footage is crucial to protecting your margins. Use these conversions to avoid surprises and keep your operations running smoothly. By staying informed, you’ll be able to maximize your resources and improve your bottom line with confidence.