What moisture content is assumed?

Results assume green wood at about 75% moisture content, typical for freshly felled logs. Actual weight varies with site conditions and season.

Can I use metric units?

Yes. Switch to metric to enter diameters in centimeters, length in meters, and receive weight in kilograms.

Estimated Log Weight Calculator

Choose a species and enter small/large end diameters and length to estimate single and total log weight.

How to calculate log weight•FAQ

Species

Small End Diameter (Inches)

Large End Diameter (Inches)

Length (Feet)

No. of logs this size

Units:

Estimate

Average diameter14 in

Volume43.05 ft³

Estimated density40.93 lb/ft³

Weight per log1,762.29 lb

Total weight (1 log)1,762.29 lb

Assumes ~75% moisture content (green). Estimates only—actual weights vary with moisture and growth conditions.

Frequently Asked Questions

How do you calculate the weight of a log?

We use your small and large end diameters and the log length to estimate the frustum volume, then multiply by an estimated green density for the chosen species. The result shows weight per log and total weight.

How to calculate the weight of a log?

Select the species, enter diameters and length, pick imperial (in/ft) or metric (cm/m), and read the instant estimate. For imperial, round inputs to whole numbers.

How is log weight estimated?

Volume is computed from a frustum approximation; density comes from species-specific gravity values representative of green wood (~75% MC). Actual weights vary with moisture and site conditions.

How to calculate drug solubility using molecular weight and log?

This tool is for timber log weight, not chemical solubility (logS/logP). Please use a chemistry-focused calculator for those models.

How to calculate log molecular weight?

If you mean the logarithm of molecular weight in chemistry, that is outside this tool’s scope. Here, “log” refers to a wood log; we estimate its mass from species and dimensions.

Worked Examples

These examples are computed with the same formula used above.

Example (Imperial): White Oak log

14 in × 18 in × 12 ft

Volume: 67.37 ft³
Estimated density: 67.89 lb/ft³
Weight: 4,573.81 lb

Example (Metric): Eastern White Pine log

35 cm × 42 cm × 4 m

Volume: 0.47 m³
Estimated density: 525 kg/m³
Weight: 245.15 kg

Calculator Instructions

Small End Diameter: Enter the measured diameter at the small end of the log in inches. Round to whole numbers for imperial. Avoid bumps or protrusions.

Large End Diameter: Enter the measured diameter at the large end in inches. Round to whole numbers for imperial. Ignore knots and irregularities.

Length: Enter the length in feet. Round to whole numbers for imperial.

Quantity: Enter the number of logs of this size. Use whole numbers.

About & Methodology

We model the log as a tapered frustum and multiply the computed volume by a species-specific estimate of green density. Assumes ~75% moisture content; actual weights vary with site and season. Learn more about assumptions and references on theAbout page.

What affects log weight?

Moisture content (MC): Freshly felled logs are heavier than air‑dried ones. This calculator assumes green wood (~75% MC).

Species density: Different species have different basic specific gravity, which strongly affects weight.

Taper and defects: Irregular shapes, rot pockets, or large knots change actual volume compared to the smooth frustum model.

Measurement accuracy: Measure inside bark where possible and avoid bumps or flares at the butt.