# Doyle Log Rule Calculator – Log Board Foot Calculator (Online)

Nathan Clark | 🗓️Modified: March 3, 2024 | ⏳Time to read:7 min

In forestry, accurately estimating the volume of timber harvested is essential for sustainable management and efficient resource utilization.

The Doyle Log Rule is a widely used method for estimating the board feet of timber in a log based on its dimensions.

To streamline this process, we’ve developed the Doyle Log Rule Calculator, a user-friendly tool designed to simplify log measurement and calculation for forestry professionals and enthusiasts alike.

# Doyle Log Rule Calculator

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## About the Doyle Log Rule

The Doyle Log Rule Calculator is a versatile tool that enables users to quickly and accurately estimate the board feet of timber in a log using the Doyle Log Rule formula. With its intuitive interface and straightforward functionality, this calculator simplifies the process of log measurement and calculation, allowing users to obtain precise estimates with ease.

Using the Doyle Log Rule Calculator is simple and straightforward. Users input two key parameters: the length of the log in feet and the diameter of the log’s small end inside bark in inches. Once these values are entered, the calculator applies the Doyle Log Rule formula:

`board feet = (((d - 4) / 4)^2) * L`

Where:

• d represents the diameter of the log measured on the small end inside bark in inches.

Upon clicking the “Calculate” button, the calculator computes the board feet of timber in the log based on the provided dimensions. The result is displayed instantly, providing users with valuable insights into the volume of timber contained within the log.

## Features

The Doyle Log Rule Calculator offers several features to enhance usability and functionality:

1. Simple Input Fields: Users can easily input the length of the log and the diameter of its small end inside bark using intuitive input fields.
2. Instant Calculation: With the click of a button, the calculator performs the necessary computations and displays the estimated board feet of timber in the log.
3. Clear Results Display: The calculated board feet are presented clearly, allowing users to quickly interpret and utilize the results for their forestry activities.
4. Reset Functionality: A convenient “Reset” button enables users to clear the input fields and start fresh, facilitating multiple calculations in a single session.

## Benefits

The Doyle Log Rule Calculator offers numerous benefits to forestry professionals, including:

• Accuracy: By applying the Doyle Log Rule formula, the calculator provides accurate estimates of timber volume, aiding in precise resource management and planning.
• Efficiency: The calculator streamlines the process of log measurement and calculation, saving time and effort for forestry professionals tasked with estimating timber volume.
• Accessibility: Accessible via any web browser, the calculator is available to forestry professionals and enthusiasts worldwide, empowering them with valuable tools for forestry management and decision-making.

## How do you use a Doyle log scale ruler?

A Doyle log scale ruler is a specialized tool used by forestry professionals to measure the diameter of logs and estimate their board feet based on the Doyle log scale. To use a Doyle log scale ruler, simply place the ruler against the small end of the log and align the diameter measurement with the corresponding board feet scale on the ruler. By reading the board feet measurement from the ruler, you can quickly estimate the volume of lumber in the log based on the Doyle log scale.

## What is the international 1/4 inch log rule?

The international 1/4 inch log rule, also known as the International Log Rule (ILR) or the Scribner log rule, is another commonly used method for estimating the volume of lumber in logs. Unlike the Doyle log scale, which is based on a fixed formula, the International 1/4 inch log rule uses a series of tables or conversion factors to calculate board feet based on log diameter and length. This log scaling method is widely accepted and used in various regions around the world.

## How do you calculate the amount of lumber in a log?

Calculating the amount of lumber in a log involves using log scaling methods such as the Doyle log scale or the International 1/4 inch log rule. To calculate lumber volume using the Doyle log scale, measure the length of the log in feet and the diameter of its small end inside bark in inches.

Then, apply the Doyle log scale formula to estimate the board feet of lumber in the log.

Alternatively, you can use the International 1/4 inch log rule to calculate lumber volume based on log diameter and length using conversion tables or factors.

## How do you calculate board feet from a log?

1. Measurements: Begin by accurately measuring the dimensions of the log. You’ll need to determine the length, diameter, and any taper present in the log. Measure the length from end to end in feet, the diameter at the small end (the top end if the log is standing vertically) in inches, and note any taper or irregularities in the log’s shape.
2. Calculate Volume: The volume of a cylindrical log can be calculated using the formula for the volume of a cylinder: Volume = π * (radius^2) * length. However, since logs are generally not perfect cylinders due to taper, an estimation method is commonly used. One common approach is the Doyle Log Scale, which estimates the board footage based on the diameter of the log at the small end and its length.
3. Using a Log Scale: Log scales are tables or charts that provide estimates of board feet based on the diameter and length of the log. These scales are specific to different species of trees and are widely used in the lumber industry. To use a log scale, locate the diameter of the log at the small end in the left-hand column and the length of the log in the top row. The intersection of these values will provide an estimate of board feet.
4. Adjust for Taper: Since logs typically taper from one end to the other, it’s essential to account for this when calculating board feet. Some log scales incorporate a taper factor into their calculations, while others require you to make adjustments manually based on the log’s shape.
5. Summing Up: If you’re dealing with multiple logs, repeat the calculation process for each log and then sum up the total board feet to determine the overall volume of lumber.

## Tips for Accurate Calculations:

• Use precise measurements: Accurate measurements of length and diameter are crucial for precise calculations.
• Understand log scale variations: Different log scales may provide slightly different estimates, so be consistent in your choice of scale.
• Account for waste: Keep in mind that not all of the wood in a log will be usable due to defects, knots, or other imperfections. Adjust your calculations accordingly to account for waste.

## Conclusion

The Doyle Log Rule Calculator is a valuable resource for forestry professionals seeking to accurately estimate timber volume and optimize resource utilization. With its user-friendly interface, instant calculation capabilities, and accurate results, this calculator simplifies log measurement and calculation, making it an indispensable tool for forestry operations. Whether managing forests, conducting timber inventories, or planning harvesting activities, the Doyle Log Rule Calculator provides the essential functionality needed to make informed decisions and promote sustainable forestry practices.