Board Feet Calculator

Ultimate Board Feet Calculator for Lumber and Logs

Whether you are a woodworker, sawmill operator, contractor, carpenter, or a DIY enthusiast, understanding material volume is essential. Our Board Feet Calculator does exactly that by helping you accurately estimate the volume of your wood boards and logs. By calculating board feet, you can confidently plan material costs, manage inventory, and minimize waste on any project. Use this tool for both milled lumber and raw log material estimates, making your board feet calculation fast and precise every time you need to calculate board feet.

The Board Feet Formula

                                Board Feet = Thickness × Width × Length ÷ 12
                            

This is the standard formula when measuring thickness and width in inches, and length in feet. If you are measuring all three dimensions in inches, the formula changes slightly to: Board Feet = Thickness × Width × Length ÷ 144. One board foot is a unit of volume representing a piece of wood that is 12 inches wide, 12 inches long, and 1 inch thick (144 cubic inches).

💡 Material Planning & Estimates

Board feet are commonly used across the industry for lumber pricing and material planning. Keep in mind that when calculating log volume (using scales like Doyle or Scribner), the results are estimates. Actual sawmill yield can vary significantly based on the log's shape, internal defects, wood species, and the specific cutting kerf of the mill.

Core Features

Dual Calculation Modes

Seamlessly switch between calculating exact volume for milled lumber and estimating yield for raw logs.

Flexible Unit Conversion

Input your dimensions in inches, feet, centimeters, or meters, and let the tool handle the complex unit conversions automatically.

Waste Adjustment

Factor in a custom waste percentage to ensure you have enough usable material for your construction or woodworking project.

Cost & Formula Breakdown

Enter a price per board foot to instantly see your total cost estimate, alongside a transparent breakdown of the exact formula used.

How to Use the Calculator

Select Your Mode

Choose 'Lumber Board Feet' for milled, dimensional wood or 'Log Volume Estimate' if you are scaling raw timber.

Enter the Dimensions

For lumber, input the thickness, width, and length. For logs, input the small-end diameter and the total log length. Adjust the units (inches, feet, cm, m) as needed.

Adjust Quantity and Waste

Enter the total number of boards or logs. You can also apply an optional waste percentage to ensure you purchase enough material for your project.

Get Your Estimate

The calculator instantly processes the formula and displays your total board feet, cubic feet equivalent, and an estimated cost if a price per board foot was provided.

Understanding Measurement Types

Feature	Option 1	Option 2
Measurement Focus	Board Feet (BF)	Linear Feet (LF) / Cubic Feet (CF)
What it measures	Volume specific to the lumber industry (144 cubic inches).	LF measures only length; CF measures standard volume (1728 cubic inches).
Best used for	Pricing hardwoods, purchasing bulk lumber, and log sawmill estimates.	LF is used for trim and molding. CF is used for shipping and general space geometry.
Formula Required	(Thickness × Width × Length) ÷ 12	LF requires no formula. CF requires Length × Width × Height (in feet).

Frequently Asked Questions

How to calculate board feet?

To calculate board feet for lumber, multiply the thickness (in inches) by the width (in inches) by the length (in feet), and then divide the result by 12.

How do you calculate board feet in lumber?

For dimensional lumber, measure the thickness and width in inches and the length in feet. Multiply them together and divide by 12. If all your measurements are in inches, multiply thickness by width by length and divide by 144.

How to calculate board feet in a log?

Calculating board feet in a log requires a log scaling rule, such as the Doyle, Scribner, or International 1/4-inch rule. You measure the diameter of the log at its small end (inside the bark) and its length in feet, then apply the specific mathematical formula for your chosen scale to estimate the milled lumber yield.

How is board feet calculated?

Board feet is a measurement of volume. It is calculated by determining the total cubic inches of the wood (Thickness × Width × Length in inches) and dividing by 144, since one board foot equals exactly 144 cubic inches of solid wood.

What is a board foot?

A board foot is a specialized unit of measure for the volume of lumber in the United States and Canada. It represents a piece of wood that is 1 foot long, 1 foot wide, and 1 inch thick.

How many board feet are in a 2x4?

An 8-foot long 2x4 contains 5.33 board feet. You calculate this by multiplying 2 (thickness) x 4 (width) x 8 (length in feet) and dividing the result by 12.

Enter Dimensions

Estimated Results

Calculation Formula