Understanding Board Feet to US Fluid Drams Conversion
A board foot is the timber-trade unit for lumber volume, equal to 144 cubic inches or about 2.360 litres. A US fluid dram is a very small liquid-volume unit equal to one-eighth of a US fluid ounce, roughly 3.697 millilitres, historically used in pharmacy and apothecary dosing. Because the two units differ so greatly in scale, converting board feet to fluid drams yields large numbers, useful mainly for illustrating the vast range of customary volume units.
Conversion Formula
To convert Board Feet to US Fluid Drams, multiply by this factor:
Step-by-Step Example
Convert 25 Board Feet to US Fluid Drams.
How to Convert Board Feet to US Fluid Drams
Express a lumber volume in the small apothecary fluid dram with one factor.
- Note the board feet: Each board foot is 144 cubic inches of timber.
- Multiply by 638.3377: This is the number of US fluid drams in one board foot.
- Run the numbers: For 25 board feet, compute .
- Report the result: The answer is 15958.4 US fluid drams.
Board Feet to US Fluid Drams conversion table
| Board Feet (board-foot) | US Fluid Drams (fl-dr) |
|---|---|
| 0 | 0 |
| 1 | 638.3377 |
| 2 | 1276.675 |
| 3 | 1915.013 |
| 4 | 2553.351 |
| 5 | 3191.688 |
| 6 | 3830.026 |
| 7 | 4468.364 |
| 8 | 5106.701 |
| 9 | 5745.039 |
| 10 | 6383.377 |
| 15 | 9575.065 |
| 20 | 12766.75 |
| 25 | 15958.44 |
| 30 | 19150.13 |
| 40 | 25533.51 |
| 50 | 31916.88 |
| 60 | 38300.26 |
| 70 | 44683.64 |
| 80 | 51067.01 |
| 90 | 57450.39 |
| 100 | 63833.77 |
| 150 | 95750.65 |
| 200 | 127667.5 |
| 250 | 159584.4 |
| 300 | 191501.3 |
| 400 | 255335.1 |
| 500 | 319168.8 |
| 600 | 383002.6 |
| 700 | 446836.4 |
| 800 | 510670.1 |
| 900 | 574503.9 |
| 1000 | 638337.7 |
| 2000 | 1276675 |
| 3000 | 1915013 |
| 4000 | 2553351 |
| 5000 | 3191688 |
| 10000 | 6383377 |
| 25000 | 15958440 |
| 50000 | 31916880 |
| 100000 | 63833770 |
| 250000 | 159584400 |
| 500000 | 319168800 |
| 1000000 | 638337700 |
What is the Board Foot?
The board foot is a unit of volume used in North America to measure sawn lumber and hardwood. It represents a piece of wood one foot long, one foot wide, and one inch thick.
Definition
A board foot is defined as exactly 144 cubic inches — the volume of a board 12 in × 12 in × 1 in.
Equivalently, one board foot equals cubic foot, or 2,359.74 cubic centimetres.
Origin and History
The board foot arose in the 19th-century American and Canadian lumber trade as a practical way to price rough-sawn timber by wood content rather than by finished dimensions. Because a "1-inch" board and a "12-inch" width refer to nominal (pre-planing) sizes, the board foot standardized how mills, wholesalers, and builders quoted and sold lumber. It remains the customary trade unit in the United States and Canada today.
Law and Notable Facts
The board foot is recognized in U.S. and Canadian lumber commerce and standards, where large volumes are quoted in "thousand board feet" (MBF), with M denoting the Roman numeral for 1,000. Board-foot content is calculated from nominal dimensions, so a nominal "2×4" (actually about 1.5 in × 3.5 in when surfaced) is still counted at its nominal 2 in × 4 in size — meaning the buyer pays for wood removed during planing. Rough-sawn hardwoods are commonly measured in "quarters" of nominal thickness (4/4, 5/4, 8/4).
Real-World Examples and Conversions
- A board 8 ft long × 6 in wide × 1 in thick contains board feet.
- A nominal 2×4 stud 8 ft long counts as board feet.
- One thousand board feet (1 MBF) equals about 2.36 cubic metres of wood, a typical way to price bulk lumber shipments.
- One board foot equals roughly 2.36 litres, so a small stack of ten board feet holds about 23.6 litres of wood volume.
What is the US Fluid Dram?
The US fluid dram (also spelled fluid drachm) is a small United States customary unit of liquid volume, historically important in pharmacy and medicine for dispensing doses of liquid medication.
Definition
The US fluid dram is defined as one eighth of a US fluid ounce, or equivalently 60 minims.
Since the US fluid ounce is exactly 29.5735295625 mL, a fluid dram equals 3.6966912 mL. The UK/imperial fluid drachm is slightly larger at about 3.5516 mL (1/8 of the imperial fluid ounce).
Origin and History
"Dram" derives from the Greek drachma, an ancient coin and weight. The apothecaries' system split the fluid ounce into 8 fluid drams and each dram into 60 minims, giving pharmacists a fine graduation for compounding and measuring liquid remedies.
Law and Notable Facts
The fluid dram is a legal US customary unit but is now largely obsolete in clinical practice, superseded by milliliters. Its legacy survives in the term "dram" for a small pour of whisky and in the traditional 8-dram, 1-fluid-ounce medicine bottle.
Real-World Examples and Conversions
- A single US fluid dram is about 3.70 mL, roughly three-quarters of a metric teaspoon.
- 8 US fluid drams equal 1 US fluid ounce (29.5735 mL).
- 1 US fluid dram = 60 minims ≈ 0.75 teaspoon; 1 mL ≈ 0.2705 US fluid dram.
Frequently Asked Questions
How many US fluid drams are in one board foot?
One board foot equals 638.3377 US fluid drams. The fluid dram is a tiny apothecary unit of about 3.697 millilitres, so a board foot contains hundreds of them.
How do I convert board feet to fluid drams?
Multiply the board-foot figure by 638.3377. For example, 3 board feet equal 1915.01 US fluid drams.
How many board feet is one US fluid dram?
One US fluid dram is only about 0.00156657 board feet, the reciprocal of 638.3377.
Where is the fluid dram still used?
The fluid dram survives mainly in older pharmacy and apothecary contexts for small liquid doses; comparing it to a board foot highlights how customary volume units span many orders of magnitude.
Is the fluid dram a mass or a volume unit?
Here it is a volume unit — the US fluid dram — not the avoirdupois dram of mass, which measures weight instead.