Farmers and forestry managers use this tool to estimate timber volume for harvest planning. It calculates board feet for individual logs or entire stands using standard industry scaling rules. Accurate volume estimates help with pricing, transport planning, and sustainable harvest tracking.
How to Use This Tool
Follow these steps to calculate timber board feet for your harvest:
- Enter the number of logs you need to measure in the Number of Logs field.
- Input the length of a representative log, then select the correct unit (feet or meters) from the dropdown.
- Measure the small and large end diameters of the log inside the bark, enter the values, and select the appropriate unit (inches or centimeters).
- Choose the board foot scale that matches your region or buyer requirements from the Scale Type dropdown.
- Click the Calculate button to generate results, or Reset to clear all fields.
- Use the Copy Results button to save your calculation for records or sharing with buyers.
Formula and Logic
Board feet are calculated using industry-standard log scaling rules, with unit conversions applied automatically:
- Unit Conversion: Length is converted to feet, diameter to inches, using 1 meter = 3.28084 feet and 1 centimeter = 0.393701 inches.
- Doyle Scale: (Small End Diameter - 4)² × Length ÷ 16. This scale is widely used for hardwoods in the eastern United States, but underreports volume for small-diameter logs.
- International 1/4 Inch Scale: 0.005454 × Length × (Large End² + (Large End × Small End) + Small End²) ÷ 3. This is the most accurate scale for softwoods and large-diameter hardwoods.
- Scribner Scale: (Small End Diameter)² × Length ÷ 20. A simplified scale common for quick estimates in western timber markets.
Total board feet are calculated by multiplying the per-log volume by the number of logs entered.
Practical Notes
When using this calculator for farm or forestry planning, keep these agriculture-specific factors in mind:
- Measure diameters inside the bark, as bark thickness can vary by species and reduce usable timber volume by 5-15%.
- Seasonal changes affect wood moisture content: green timber weighs 30-50% more than air-dried timber, which impacts transport costs.
- Pest or disease damage (e.g., emerald ash borer, pine beetle) can reduce usable board feet by up to 40% for infested logs.
- Different buyers may prefer different scaling rules: confirm the required scale with your timber purchaser before harvest.
- For uneven-aged stands, measure multiple representative logs rather than using a single log's dimensions for all trees.
Why This Tool Is Useful
Timber farmers and forestry managers rely on accurate board foot estimates for critical business decisions:
- Set fair market prices for standing timber or harvested logs.
- Plan transport logistics by estimating total volume and weight.
- Track sustainable harvest limits to maintain long-term forest health.
- Apply for agricultural loans or insurance by documenting timber assets.
- Compare offers from multiple buyers to maximize profit from harvests.
Frequently Asked Questions
Which board foot scale should I use for my timber?
Doyle Scale is standard for hardwood harvests in the eastern U.S., International 1/4 Inch Scale is preferred for softwoods and accurate valuations, and Scribner Scale is common for quick estimates in western markets. Always confirm with your buyer first.
How do I measure log diameter correctly?
Measure the diameter inside the bark at the small end (top) and large end (base) of the log using a diameter tape or caliper. If using a standard tape, measure the circumference and divide by 3.1416 to get diameter.
Does this calculator account for timber defects?
This tool calculates gross board feet based on log dimensions. Deduct 10-30% for common defects like knots, rot, or sweep (curved logs) depending on the log's condition and buyer requirements.
Additional Guidance
For best results, follow these tips when measuring timber:
- Measure logs after felling, before significant drying or bark loss occurs.
- Use the average of 3 diameter measurements per log end to account for oval-shaped trunks.
- Keep records of all calculations to track harvest yields across multiple seasons.
- Consult a local agronomist or forestry extension agent for region-specific scaling advice.