Steps Involved in Building a HouseSpike's Calculators

Early Log Rule

Spike VM

This rule appeared at about the same time as the Doyle log rule and the results of this rule are identical to the Doyle log rule.

  1. measure the diameter on the small end of the log in inches
  2. subtract 4 inches from the diameter
  3. multiply this amount by half of the remainder
  4. multiply this result by the length of the log in feet
  5. divide the previous amount by 8
  6. the result in board feet
Example:
  1. the diameter measured at the small end of the log = 24 inches and the log is 20 feet long
  2. 24 - 4 = 20
  3. 20 * 10 = 200
  4. 200 * 20 = 4000
  5. 4000 ÷ 8 = 500
  6. 500 board feet

An Early Log Rule

Length of Log in Feet ft
Diameter Log Small End in Inches in

Results:

Board Foot Result bf

Calculation

  1. enter the small end diameter of the log
  2. the length of the log in feet

Result

  1. the volume of the log in board feet


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