For example, a piece of hardwood can be 8 feet long, 10 inches wide, and 1. To calculate arc length without radius, you need the central angle and the sector area :. The main difference between a board foot and a linear foot is that a board foot is a measure of volume , whereas a linear foot is a measure of length. A board foot is generally used for lumber, and is the multiplication of its width in feet, length in feet, and thickness in inches.
A linear foot is a straight line that is 12 inches 1 foot in length. Board foot insulation is a measurement of how much volume spray foam insulation can cover. A board foot is a volume 1 ft x 1 ft x 1 in, so estimate the volume you need to fill before buying your spray foam insulation buy finding the square footage of the space. A board foot is also a common unit of measure for lumber in the USA and Canada.
A board foot of oak weighs anywhere between 3. There are no board feet in square feet , as board feet is a measure of volume and square feet is a measure of area.
However, for an area that is square feet with a depth of 1 inch, there are board feet present. Embed Share via. Table of contents: What is a board foot? How to calculate board feet? Using the lumber calculator: an example FAQ.
What is a board foot? Using the lumber calculator: an example Let's assume you want to use this board foot calculator to determine how much you should pay for a few hardwood pieces. The Doyle scale is the standard by which hardwood lumber is bought and sold. It estimates large or medium logs very close to the actual number but underestimates in smaller logs.
Because it comes in below the price , this is the scale most log buyers want to use. Log buyers typically keep a Doyle scale with them. It looks like a folding ruler with the footage labeled at each inch marker. The Doyle scale formula is based upon a tapered cylinder. Straight legs without minimal tapering will produce more board feet than the scale estimates, but it typically balances out since most logs are imperfect.
To estimate the board feet from a log, measure the average diameter of the smaller part of the log in inches. Then, measure the length of the log in feet. Move the scale's marker over to where these two measurements meet. Where the two measurements intersect is the approximate board foot output.
Home Resources Calculators Log Volume. Looking for equipment, supplies or cutting tools? Colonial Saw Southeast Tool, Inc. Doucet Machineries Inc. His original tables ranged from 10' - 24' logs, with 12" - 44" diameter small end, inside bark.
A number of the tables use the Bruce and Schumacher Scribner formula estimate assuming a 16" log :. The Scribner rule was undoubtedly an improvement on Doyle. Scribner a preacher even took aim at the log rules in use read: mostly Doyle when he first published his rule:. I have spared no pains nor expense to render them perfect; and it is to be hoped that hereafter these will be preferred to the palpably erroneous tables which have hitherto been in use.
Scribner's rule is reasonably accurate on roughly 16' logs up to a diameter around 28". However, for anything bigger there is generally overrun. Judson F. He first published that rule in Things are a bit more complicated when a tree is still standing — you can't exactly measure the diameter inside the bark of the small end of a log!
Luckily, Harry V. Wiant and Froylan Castaneda adapted three of the log tables for standing trees.
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