Log Board Foot Calculator
Disclaimer: This calculator provides board-foot estimates for planning only. Results depend on your measurements, chosen log-rule (Doyle, Scribner, International ¼”), and actual sawing conditions. Always verify volumes with a qualified sawyer, mill, or forestry professional before purchasing logs, pricing lumber, or making production decisions.
What is a Log Board-Foot Calculator?
A board‑foot is a slice of wood exactly 1 foot long × 1 foot wide × 1 inch thick. The calculator tells you how many of those slices you can get from:
- a round tree log (before sawing), or
- a stack of boards you have already cut.
Instead of thumbing through printed log‑rule tables or doing width × thickness × length math on a notepad, you just type the sizes and click CALCULATE. The tool crunches the numbers, handles metric or imperial units, and keeps a running tally so you know your total lumber volume in seconds.
Why you’ll like it
- Speed – one‑click totals, no spreadsheet or scale‑stick required.
- Accuracy – follows Doyle, International ¼″, and Scribner rules exactly.
- Flexibility – perfect for mills buying logs in metric but selling lumber in feet & inches.
- Running totals – ideal for truck tickets, log deck inventories, or end‑of‑day production reports.
How to Use the Log Board Foot Calculator
It is very easy to calculate board foot with our calculator. Follow these simple steps.
| Step | What to do |
|---|---|
| 1 · Mode | Choose Round Log to predict yield from a log, or Saw‑cut Boards to total boards you’ve sawn. |
| 2 · Sizes | Round Log: type quantity → small‑end diameter (decimal + optional fraction) → log length → pick Doyle, International ¼″, or Scribner rule. Boards: type quantity → width × thickness × length. All units are OK — inches, centimetres, feet, metres, yards, millimetres. |
| 3 · Calculate | Click CALCULATE. A line is added to the result table showing board‑feet per piece and a growing total. |
| 4 · Repeat / Reset | Keep adding loads or switch modes; the running total updates automatically. Press RESET to clear the form and table. |
Handy extras:
- Fraction picker – tap ⅛″ steps or enter any custom fraction like 5⁄16.
- Auto‑convert units – mix metric and imperial without head‑math.
Input Dimensions (Length, Width, Thickness)
First, input the following measurements of your board into our log board foot calculator.
- Thickness (in inches)
- Width (in inches)
- Length (in feet)
If you are working with a log instead of a board, enter the diameter (in inches) and the length (in feet).
Choosing Units: Inches or Feet
It is important to pick the right units before you calculate.
- Use inches for thickness and width.
- Use feet for the length. If you want, you can use inches for length, too.
Our log board foot calculator lets you choose the unit for each field. If you enter the length in feet, the calculator will divide by 12 to find board feet. If you enter the length in inches, it will be divided by 144.
Interpreting the Results
Once you type the numbers and click the “Calculate” button, our log board foot calculator will show you the total board feet.
This number tells you how much wood you have or need. It helps you:
-
- Plan how much lumber is required for your project.
- Estimate the cost.
- Compare different logs to see which gives more usable wood.
For example, if the calculator shows 20 board feet, that means your board or log has the volume of twenty one-foot by one-foot by one-inch boards. You can now decide if that is enough for your furniture, framing, or other woodworking plans. Also for Lumber Planning calculation Plywood tool will be used.
What is a Log Board Foot?
A log board foot is a way to measure how much wood is inside a round log. It tells you the volume of usable wood that can be cut from the log.
Understanding Lumber Measurement
In woodworking and sawmills, people often use the term “board foot.” A board foot is a way to measure the volume of wood. Imagine a piece of wood that is 12 inches long, 12 inches wide, and 1 inch thick. That size is exactly 1 board foot.
This type of measurement helps you know how much usable wood is in a board. It includes the length, width, and thickness, so it is more complete than just measuring the surface.
Why Log Board Feet Matter in Woodworking
Woodworkers and carpenters use board foot measurements before they start cutting. Let’s say you are making a wooden table. You will need to know how many board feet are required to make the table top and legs. This helps you buy the right amount of wood.
If you overestimate, you may spend more money and buy too much wood. If you underestimate, you might not have enough to finish your project. That is why knowing the correct board foot count helps you save money, avoid waste, and plan better.
Board Feet vs Linear and Square Feet
Many people get confused between board feet, linear feet, and square feet. But they all mean different things:
- Linear feet only measure length. For example, a piece of wood that is 10 feet long is 10 linear feet, no matter the width or thickness.
- Square feet measure area. If your floor is 10 feet long and 10 feet wide, it is 100 square feet.
- Board feet measure volume. They include length × width × thickness.
So, if you place 12 boards that are each 12 inches by 12 inches and 1 inch thick side by side, that adds up to 12 board feet.
How to Calculate Log Board Feet
Here is how to do a board foot calculation manually.
Standard Formula for Log Board Footage
To calculate board feet, you can use a simple formula:
Board Feet = (Thickness in inches × Width in inches × Length in feet) ÷ 12
This works well when you measure thickness and width in inches and length in feet. If you measure all three dimensions in inches, then use this formula instead:
Board Feet = (Thickness × Width × Length in inches) ÷ 144
The number 144 comes from the size of one board foot in cubic inches (12 × 12 = 144). So both formulas give you the same result, depending on your units.
For logs, some people use log-specific rules like the Doyle, Scribner, or International 1/4” rule. But for small sawmills or personal projects, many people still use straight measurements and apply this board foot formula.
Board Foot Formula with Example
Let’s use the formula to calculate how much wood is in a board that is:
- 2 inches thick
- 6 inches wide
- 10 feet long
Now input these values into the following formula:
Board Feet = (2 × 6 × 10) ÷ 12 = 120 ÷ 12 = 10 board feet
This means the board contains 10 board feet of lumber.
Now let’s check the same example using inches only. Since 10 feet is 120 inches:
Board Feet = (2 × 6 × 120) ÷ 144 = 1440 ÷ 144 = 10 board feet
You still get the same result. That shows why unit consistency is very important.
Tips for Accurate Measurement
- Use a good tape measure or caliper to measure thickness and width in inches.
- Measure the full length of the board in feet or convert inches to feet before using the formula.
- Always measure the widest point of the board, especially if it is rough or uneven.
- For logs, measure inside the bark, not over it, so your volume estimate is more realistic.
- When calculating many boards or logs, calculate each one separately and then add all the results.
- Keep in mind that the actual size of a board might be smaller than the name. For example, a board called a “2×4” is usually 1.5 inches thick and 3.5 inches wide.
- Some online calculators adjust for these real sizes automatically. But if you measure by hand, use the actual size for best accuracy.
Common Board Sizes and Their Board Foot Values
Standard lumber sizes often appear on project plans. It helps to know the board feet in common sizes. The following table shows typical board foot counts for popular lumber dimensions at certain lengths.
2x4, 2x6, and 2x12 Examples
Board Size | Length (ft) | Board Feet |
2 × 4 | 8 | 5.33 BF |
2 × 6 | 10 | 10 BF |
2 × 12 | 12 | 24 BF |
A two-by-four that is eight feet long contains just over five and one-third board feet. A two-by-six ten-foot long contains ten board feet. A two-by-twelve-foot feet long contains twenty-four board feet. These reference points are handy when you need to quickly estimate how many planks to buy.
Calculating for Multiple Pieces
When you’re buying several boards at once, multiply the board feet for one piece by the number of pieces. The table below illustrates how this works.
Quantity | Size | Length (ft) | Total Board Feet |
5 | 2 × 6 | 10 | 50 BF |
8 | 2 × 4 | 8 | 42.64 BF |
3 | 2 × 12 | 12 | 72 BF |
Five boards of two by six by ten feet contain fifty board feet in total because each board is ten board feet. Eight boards of two by four by eight feet contain about forty-two and two-thirds board feet. And three boards of two by twelve by twelve feet add up to seventy-two board feet. Knowing these totals helps you plan materials and avoid surprises when the lumber is delivered.
Why Use a Log Board Foot Calculator?
Saves Time in Material Planning
It takes a lot of time to do the math by hand when you are measuring many boards or logs. Our calculator solves this problem. You enter your numbers once, and the result shows up right away. This lets you plan faster and focus more on your project. You do not have to repeat the same formula again and again.
Reduces Cost Overestimation
If you guess how much wood you need, you might buy too much. That means spending more money than needed. A log board foot calculator helps you get the exact number. You can then buy just the right amount of lumber for your project. This saves money and avoids waste.
Helps Avoid Waste in Projects
Cutting wood always creates some leftover pieces. But with better planning, you can reduce how much wood gets wasted. The calculator helps you match what you buy to what you need. That means fewer scraps, less trash, and a cleaner, more efficient job. It also supports smarter, more sustainable woodworking.
Log Board Foot Calculation in Real Projects
Furniture Making
When building furniture like a table, chair, or cabinet, each piece has specific measurements. A table top might need 20 board feet, and the legs might require 4 more. The log board foot calculator helps find out how much total lumber is needed by entering the exact dimensions. This makes it easier to buy the right amount of wood, plan cuts around defects, match grain patterns, and reduce waste.
Flooring and Decking
For flooring or decking projects, most boards have the same thickness and width. Use our calculator to enter the size of one board and the number of boards required to cover the total area. This helps calculate how many board feet are needed before buying the wood. The result also guides how to space joists or beams for support and keeps the structure safe and balanced.
Timber Framing
In timber framing, large beams and posts support the structure. Each beam needs to be cut with care and precision. By entering beam dimensions into our calculator, it is easy to find the board foot amount for each one. This helps plan how many logs are needed and estimate the total cost. It also helps check if the available logs will produce enough lumber for the full frame.
FAQs
To calculate board feet, use this formula:
(Thickness in inches × Width in inches × Length in feet) ÷ 12
This gives the volume of wood in board feet.
Yes. You can use our log board foot calculator for rough-sawn boards. Just measure the actual thickness, width, and length of the board before cutting or trimming. Use those numbers in the calculator to get the board feet.
Yes. You can enter measurements in inches or feet. Our calculator lets you pick the units.
Enter the dimensions of each log or board one by one. Calculate the board feet for each, then add all the results together.
No. A board foot measures volume in wood based on 1 inch thick, while a cubic foot is based on a full 12 inches thick.
1 cubic foot = 12 board feet
Board feet are used more often for lumber pricing and planning.
Always add 5% to 15% extra to your board foot total. This covers cutting mistakes, knots, cracks, and trimming. For rough projects, 5% may be enough. For fine furniture or matching grain, plan for up to 15% extra.