Log Weight Calculator

Calculating the weight of a log begins by determining its geometric volume. For a standard log, the mid-diameter method is used: diameterMid = (diameterSmall + diameterLarge) / 2. Next, the cylindrical volume of the log is calculated using the formula logVolume = π × (diameterMid / 2)² × length. Finally, the absolute mass is found by multiplying this volume by the specific wood density of the chosen species: logWeight = density × logVolume. For stacked logs or lumber packages, stack geometry and packing limits are applied to determine total transport weight.

Let us calculate the weight of a fresh Red Oak log destined for a sawmill. Assume the log has a small end diameter of 14 inches (0.356 m), a large end diameter of 18 inches (0.457 m), and a length of 12 feet (3.658 m). First, find the mid-diameter: (14 + 18) / 2 = 16 inches (0.406 m). Next, compute the volume: Volume = π × (0.203)² × 3.658 ≈ 0.473 cubic meters. Green Red Oak has an approximate density of 740 kg/m³. Multiplying the volume by the density yields: 0.473 m³ × 740 kg/m³ = 350 kg (approx. 772 lbs) for this single log.

Always measure log diameters inside the bark at the narrowest point to ensure safety margins aren't compromised by thick outer layers. Remember that freshly cut green wood holds significantly more water and can weigh up to 50% more than kiln-dried lumber of the same dimensions. When loading trailers or trucks, distribute weight evenly across axles to remain street legal and protect your vehicle suspension.