The calculation is a simple division problem.

1. Input Log Weight: Enter the total weight of the log in pounds.
2. Select Wood Species: Choose the species of the log. This provides the density (in lbs per cubic foot) needed for the calculation.
3. Calculate Volume: The calculator divides the weight by the density to find the volume.
   Volume (ft³) = Weight (lbs) / Density (lbs/ft³)

Because green logs are mostly wood fiber plus water, dividing the scale weight by the species' green density gives you the approximate solid cubic volume. That volume then feeds other estimates, such as board foot yield or how much lumber the log can produce.

Example 1: A Truckload of Red Oak
A single Red Oak log scales at 3,000 lbs. Red Oak averages about 63 lbs/ft³ green.
Volume: `3,000 / 63 ≈ 47.6` ft³ of solid wood.

Example 2: Yellow Pine Log
A Yellow Pine log weighs 1,800 lbs. Pine averages about 55 lbs/ft³.
Volume: `1,800 / 55 ≈ 32.7` ft³. The lighter softwood yields more volume for the same weight than the dense oak.

• Using Dry Density on a Green Log: Freshly cut wood is far heavier. Feeding a kiln-dried density into a green weight will overestimate the volume. Match the density to the log's actual moisture state.
• Ignoring Bark and Dirt: A field scale weighs bark, mud, and attached debris too. That inflates the weight and therefore the volume estimate. Subtract an allowance for bark (often 5–15%).
• Picking the Wrong Species: Densities vary widely. Poplar (~42) versus White Oak (~68) nearly double the volume you compute for the same weight.
• Treating the Result as Exact: This is a bulk estimate. Individual logs vary with moisture, growth rate, and heartwood content.

"When I buy logs by the ton, I back-calculate volume just to sanity-check the seller's board foot claims. If the math comes out too good, it usually means they used an optimistic density or a generous log rule. It's a quick way to catch a bad deal before the truck is unloaded." — Sawmill Operator

"Moisture is the hidden variable. A log that sat in the sun for a month weighs less than the same log cut yesterday, so the same scale reading maps to a different volume. When precision matters, weigh and measure on the same day."

• Verifying Purchases: Confirm that a load bought by weight delivers the expected volume.
• Estimating Lumber Yield: Convert scale weight to volume, then apply a log rule to approximate board feet.
• Biomass & Firewood: Turn tonnage into stacked or cubic volume for fuel planning.
• Equipment Loading: Reconcile weigh-station tickets with the volume your trailer or mill can actually hold.

• Green Weight: The weight of freshly cut wood including its natural moisture — the basis for the densities used here.
• Density (lbs/ft³): How much one cubic foot of a species weighs; the conversion factor between weight and volume.
• Stumpage: The value of a standing tree, often negotiated by estimated volume derived from weight.