Log Weight Calculator
Estimate the weight of a log.
Estimate a log's weight from its size (a cylinder).
How the Math Works
The Log Weight Calculator uses the formula weight = π (d/2/12)² × length × density to estimate a log's mass. Here, π (pi) and the squared radius term (d/2/12)² calculate the log's cross-sectional area after converting the diameter (d) from inches to feet. Multiplying by length (in feet) gives the volume in cubic feet, which is then scaled by the wood's density (typically in pounds per cubic foot) to determine total weight. This approach assumes logs are perfect cylinders and accounts for unit conversions to ensure accuracy.
Practical Applications
To use this calculator, measure the log's diameter at its widest point and its length in feet. Select or input the wood's density based on species—common hardwoods range from 35-50 lbs/ft³, while softwoods are lighter. For example, a 24-inch diameter, 10-foot-long oak log (density ~49 lbs/ft³) would yield approximately 3,769 pounds. This helps professionals estimate load limits for transport, plan material quantities, or assess structural capacity for projects like decks or beams.
Day-to-Day Use
In daily life, this tool simplifies tasks like calculating firewood requirements for heating. By estimating weight, you can determine how many logs fit in your truck or storage space, avoiding costly overloading. It also aids in DIY projects, such as building a fire pit or fence, by ensuring you order the right amount of lumber. Additionally, understanding log weight helps with safety planning when handling heavy materials, reducing strain and potential injury risks.
Worked example
12 in × 8 ft green log → ~314 lb.
FAQ
Green vs dry?
Fresh-cut logs are far heavier due to water content.