# Hoppus Rule

The hoppus foot is named for Edward Hoppus who introduced this measurement in his manual of practical calculations printed in 1736.

*It is plain to the most casual observer that this is a most primitive system, and that "Hoppus" whoever he might be, succeeded in attaching his name thereto, not as its inventor, but merely as its tabulator, for his popular work is nothing but a ready-reckoner, compiled after the manner of the old road-books of the coaching days, for carrying in the pocket.* _{(The Journal of the Society of Estate Clerks of Works, 1898)}.

Hoppus feet are calculated at 78.5% from cubic volume of a round log allowing for 21.5% waste.

Measure the length of the log in feet and the girth of the log at midlength.

#### Logging Calculators

##### Log Rule Calculators

Brereton Log Rule - ImperialBrereton Log Rule - Metric

Cubic Metre Rule

Doyle Log Rule

Francon Measure

Hoppus Rule

International 1/8-inch Log Rule

International 1/4-inch Log Rule

International 1/4-inch Log Rule (Grosenbaugh)

International 1/8-inch and 1/4-inch Log Rules

Japanese Agricultural Standard (JAS)

Nova Scotia Cubic Metre Log Scale

Ontario Log Rule

Scribner Log Rule

Scribner Decimal C

Comparing Results from Various Board Feet Log Rules

##### Log Volume Formula Calculators

Chinese National StandardHuber's Formula

Newton's Formula

Pressler's Cubic Foot Formula

Smalian's Formula - Metric

Smalian's Formula - Imperial

Spike's Rule

William Klemme

##### Log Weight and Volume Calculators

Calculate the Merchantable Volume and Green Weight of a LogVolume of Bark

Estimating the Weight of a Log

##### Wood and Moisture

Equilibrium Moisture Content of Wood - CelsiusEquilibrium Moisture Content of Wood - Fahrenheit

Moisture Content Measured On A Dry Basis

Moisture Content Measured On A Wet Basis

Proportional Weight of Wood and Water in One Pound

##### More

Converting between Wood Specific Gravity BasesDiameter of Tree from Circumference Measurement