Log Weight Calculator – How to Use It

A Log Weight Calculator is a tool that estimates the weight of a log based on its diameter, length, and wood density, making it essential for forestry, timber transport, and firewood estimation.

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Why Use a Log Weight Calculator?

Logs can vary significantly in weight depending on:

• Diameter (thickness)
• Length
• Wood Species (which affects density)

Estimating log weight accurately is crucial for:

• Transport safety (avoiding overloading trucks or trailers)
• Pricing timber or firewood
• Planning lifting operations

This calculator uses the cylindrical volume formula combined with the density of the chosen wood to estimate the total weight.

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How the Calculation Works

The formula used is:

iniCopyEditWeight = π × (radius²) × length × density

Where:

• Radius = Diameter ÷ 2
• Length in meters
• Density in kg/m³

Example:
If a log has a diameter of 30 cm, a length of 2.5 m, and a density of 700 kg/m³:

• Radius = 0.15 m
• Volume = π × (0.15²) × 2.5 ≈ 0.1767 m³
• Weight = 0.1767 × 700 ≈ 123.69 kg

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Step-by-Step Guide to Using the Calculator

Step 1 – Enter the Diameter

• Input the log diameter in centimeters.
• Measure at the thickest part if the log is uneven.

Step 2 – Enter the Length

• Input the log length in meters.
• Use an accurate tape measurement for best results.

Step 3 – Enter Wood Density

• Input the density of the wood in kg/m³.
• Common densities:
  • Pine: ~500 kg/m³
  • Oak: ~750 kg/m³
  • Teak: ~650 kg/m³
  • Mahogany: ~850 kg/m³

Step 4 – Click “Calculate Weight”

• The result will display the estimated weight in kilograms.

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Tips for Accuracy

• Measure the diameter at the middle of the log.
• Use species-specific density values for better accuracy.
• For very irregular logs, take several diameter measurements and average them.

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FAQ – Log Weight Calculator

Q1: Can I use this calculator for logs with bark?
Yes, but if you want only the wood’s weight, measure without bark or adjust density accordingly.

Q2: Is density affected by moisture content?
Absolutely. Fresh (green) logs weigh more because of higher moisture. Use density values for green wood or seasoned wood, depending on the condition of your logs.

Q3: Can this calculator be used for splitting firewood?
Not accurately, because split pieces vary in shape. It’s designed for whole logs.

Q4: What’s the difference between green weight and dry weight?

• Green weight includes natural moisture in freshly cut logs.
• Dry weight is after seasoning or kiln drying, and is lighter.

Q5: Why is estimating weight important in logging?
For safety, cost estimation, transport planning, and avoiding machinery overload.