Log Weight Calculator
ConstructionCalculate the weight of a cylindrical log from its diameter, length, and wood species. Get instant weight and volume estimates for pine, oak, maple, and more.
Estimated Log Weight
446.8
Log Volume
11.17
What is a Log Weight?
A Log Weight Calculator estimates how much a cylindrical log weighs based on its diameter, length, and wood species. Loggers, sawmill operators, arborists, and firewood sellers use this kind of tool to plan safe handling, transport, and pricing without needing a truck scale for every log. Because wood density varies enormously between species — from lightweight pine to dense oak — an accurate weight estimate depends on knowing both the log's physical dimensions and what type of tree it came from.
The calculator treats the log as a simple cylinder: it converts diameter to a radius in feet, multiplies by length to get volume in cubic feet, then multiplies that volume by the selected species' density in pounds per cubic foot. This mirrors the standard approach used in forestry and log-hauling for quick field estimates. If you're also planning what usable lumber a log will yield once milled, pair this with the Lumber Calculator to estimate board feet and cost.
How to use this Log Weight calculator
- Measure the log's Log Diameter at the midpoint (or average of both ends) and enter it in inches, using the slider or typing the value directly.
- Measure the Log Length in feet and enter it using the slider.
- Select the closest match from Wood Species — Pine, Douglas Fir, Maple, Average Hardwood, or Oak — to apply the correct density.
- Review the Estimated Log Weight result, shown prominently as the primary output in pounds.
- Check the Log Volume output if you also need cubic footage for cord calculations or milling yield estimates.
- Adjust any input and watch the results update instantly — useful for comparing several logs before loading a trailer.
Formula & Methodology
The calculator models the log as a right cylinder and applies the standard volume-to-weight formula used in forestry: radius_ft = (diameter ÷ 12) ÷ 2 volume_ft³ = π × radius_ft² × length weight_lb = volume_ft³ × density Wherediameteris in inches,lengthis in feet, anddensityis the selected species' average weight in pounds per cubic foot (Pine 30, Douglas Fir 34, Maple 38, Average Hardwood 40, Oak 45). Worked example: A 16-inch diameter, 8-foot Average Hardwood log. - radius_ft = (16 ÷ 12) ÷ 2 = 0.667 ft - volume_ft³ = π × 0.667² × 8 = 11.17 ft³ - weight_lb = 11.17 × 40 = 446.7 lb The same log in Oak (45 lb/ft³) would weigh approximately 502.7 lb, illustrating how much species selection affects the final estimate.
Frequently Asked Questions
The calculator gives a close estimate based on the log's diameter, length, and the average density of the wood species you select. Real-world logs vary in moisture content, taper, and internal defects, so actual weight can differ by 10-20% from the estimate. For safety-critical work like rigging or crane loads, always add a margin and confirm with a scale when possible.
The tool converts the log to a cylinder, calculates volume as π multiplied by radius squared multiplied by length, then multiplies that volume by the wood's density in pounds per cubic foot. Radius is derived by halving the diameter and converting from inches to feet before the volume step. This produces weightLbs, the calculator's primary output.
Density varies widely across species because of differences in cell structure, moisture retention, and grain tightness. Pine averages around 30 lb/ft³ while oak runs closer to 45 lb/ft³, so two logs of identical size can differ in weight by 50% or more. Selecting the correct species in the calculator is the single biggest factor in getting an accurate estimate.
No, the calculator assumes a solid, uniform cylinder using dry or air-dried average density figures for each species. Freshly cut, green logs typically weigh more due to higher moisture content, sometimes 20-40% heavier than seasoned wood. Bark, hollow centers, and irregular taper are also not factored in, so treat the result as a working estimate rather than an exact figure.
Divide the circumference by π (approximately 3.14159) to get the diameter, then enter that value into the calculator. For example, a log with a 50-inch circumference has a diameter of roughly 15.9 inches. Many loggers measure circumference with a tape measure since it's faster than finding the true center for a diameter reading.
Log weight measures the total mass of the round, uncut log including waste from sawing, bark, and rounding. Board foot volume, calculated by tools like the [Lumber Calculator](/lumber-calculator/), measures only the usable milled lumber that can be cut from a log after accounting for kerf loss and slabs. The two figures serve different purposes: weight matters for transport and equipment capacity, while board footage matters for milling yield and pricing.
Yes, the calculator works for any cylindrical log regardless of end use, including firewood rounds before splitting. Keep in mind that firewood is usually sold and measured by the cord (a stacked volume measurement) rather than by weight, so this tool is best used to estimate the weight of individual rounds or a truckload for transport planning.
It depends heavily on size and species, but as a reference point, a 16-inch diameter, 8-foot pine log weighs roughly 335 pounds using average density figures. The same dimensions in oak would weigh closer to 500 pounds. Use the calculator with your specific measurements and species for a precise figure.
Equipment like log splitters, trailers, cranes, and skid steers all have rated weight capacities that should not be exceeded for safety. Knowing the estimated weight in advance helps you choose the right equipment, avoid overloading a trailer axle, and plan crew size for manual handling. It also helps with freight quotes when logs are being shipped or delivered.
Cubic footage is a standard unit used in forestry and sawmilling to estimate milling yield, storage space, and firewood cord equivalents. Roughly 128 cubic feet of stacked wood equals one full cord, so the volumeCubicFeet output can help you estimate how many logs are needed to fill a cord or truck bed. It's also useful when comparing logs of different shapes on an equal basis.
The calculator uses average dried density figures: Pine at 30 lb/ft³, Douglas Fir at 34 lb/ft³, Maple at 38 lb/ft³, an Average Hardwood blend at 40 lb/ft³, and Oak at 45 lb/ft³. These are representative averages for common construction and firewood species; actual density can vary by region, tree age, and moisture level.
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