Calculate A Cord Of Wood

The professional tool to measure firewood volume and estimate value.

Standard Firewood Measurements Reference

Common firewood units used in North America.

Term	Approx. Dimensions	Volume (cu ft)	% of Full Cord
Full Cord	4′ × 4′ × 8′	128	100%
Face Cord (16″)	4′ × 8′ × 16″	~42.6	~33.3%
Face Cord (24″)	4′ × 8′ × 24″	~64	50%
Rick	Varies (often = Face Cord)	Variable	Variable

What is Calculate a Cord of Wood?

When buying or selling firewood, the terminology can be confusing. To calculate a cord of wood is to determine the precise volume of a stacked pile of firewood to ensure you are getting exactly what you paid for. The standard unit of measurement for firewood in the United States and Canada is the “cord.”

A cord is a legal unit of measure defined as a stack of wood that is tightly packed and measures 128 cubic feet in volume. This is essential for homeowners who rely on wood for heating, as well as for commercial sellers who need to price their inventory accurately. Understanding how to calculate a cord prevents you from being shortchanged by “face cords” or “ricks” sold as full cords.

Common misconceptions often arise around the term “face cord.” A face cord has the same face area (4 feet by 8 feet) as a full cord but only the depth of the log length, which is usually 16 inches. A face cord is roughly one-third the volume of a full cord.

Cord of Wood Formula and Mathematical Explanation

The mathematics behind the calculation is relatively simple geometry. The formula to calculate a cord of wood determines the volume of a rectangular prism and then compares it to the standard definition of a cord.

Core Formula:
Total Cords = (Length × Height × Width) / 128

Where the Length, Height, and Width are all measured in feet. If you measure in inches, you must first divide each dimension by 12 to convert it to feet, or calculate the total cubic inches and divide by 221,184 (which is 128 × 1728).

Variables used to calculate a cord of wood.

Variable	Meaning	Unit	Typical Range
L	Length of the stack	Feet (ft)	4ft – 20ft+
H	Height of the stack	Feet (ft)	2ft – 6ft
W (or D)	Width/Depth (Log Length)	Feet (ft)	1.33ft (16″) – 4ft
128	Volume of 1 Standard Cord	Cubic Feet (ft³)	Constant

Practical Examples (Real-World Use Cases)

Example 1: The Standard Backyard Stack

John buys a delivery of wood. He stacks it along his fence. The stack measures 12 feet long and 4 feet high. The logs are cut to a standard length of 16 inches (1.33 feet).

• Volume Calculation: 12 ft × 4 ft × 1.33 ft = 63.84 cubic feet.
• Cord Calculation: 63.84 / 128 = 0.499 Cords.
• Interpretation: John has approximately half a cord of wood. If he paid for a full cord ($300), he received only half the value ($150).

Example 2: The Double Row Woodshed

Sarah fills her woodshed which accommodates two rows of logs. Her stack is 8 feet long, 5 feet high, and because she has two rows of 18-inch (1.5 ft) logs, the total depth is 3 feet.

• Volume Calculation: 8 ft × 5 ft × 3 ft = 120 cubic feet.
• Cord Calculation: 120 / 128 = 0.94 Cords.
• Financial Impact: This is very close to a full cord. If the wood settles, it might measure slightly less, but this is a respectable delivery volume.

How to Use This Cord Calculator

Using our tool to calculate a cord of wood is straightforward. Follow these steps to get an accurate result:

1. Select Your Units: Choose whether you measured your stack in feet, inches, or meters using the dropdown menu.
2. Measure Length: Run a tape measure along the entire length of the woodpile. Input this value.
3. Measure Height: Measure from the ground to the average top of the stack. Do not include loose pieces sticking up high.
4. Measure Depth: This is usually the length of the firewood logs. If you have multiple rows stacked, measure the total depth of all rows combined.
5. Add Price (Optional): If you want to know the value of your stack, enter the current market price for a full cord in your area.
6. Read Results: The calculator will instantly show you how many cords you have and the volume in cubic feet.

Key Factors That Affect Firewood Measurements

When you calculate a cord of wood, several external factors can influence the final volume and quality of the fuel you receive.

1. Stacking Density: A “loose thrown” cord (dumped from a truck) takes up roughly 180 cubic feet. A stacked cord is 128 cubic feet. If the wood is stacked loosely with large air gaps (Criss-cross stacking), you are getting less wood fiber per cubic foot.
2. Wood Species: While the volume calculation is identical, the energy density varies. Dense hardwoods like Oak or Hickory provide more heat (BTUs) per cord than softwoods like Pine, even if the calculated volume is the same. See our guide on best burning wood.
3. Log Length Consistency: If logs vary significantly in length, the stack may bulge or lean, making accurate height and depth measurements difficult.
4. Shrinkage: Green wood shrinks as it dries. A cord measured when green (freshly cut) may shrink by 7-10% in volume by the time it is fully seasoned.
5. Moisture Content: Wet wood is heavier but doesn’t burn well. Always check firewood moisture content before purchasing.
6. Bark Thickness: Wood with very thick bark may have slightly less solid wood fiber per cord than smooth-barked species, though this difference is usually negligible for residential heating.

Frequently Asked Questions (FAQ)

What is the difference between a face cord and a full cord?

A full cord measures 4’x4’x8′ (128 cu ft). A face cord measures 4’x8′ across the face, but the depth is just the length of the log (usually 16 inches). A face cord is typically 1/3 of a full cord.

How do I calculate a cord of wood if the stack is triangular?

If your wood is in a triangular pile (like a holster), measure the base length and the center height. Use the formula: (0.5 × Base × Height × Log Length) / 128 to estimate the cords.

Can I calculate a cord of wood in meters?

Yes. A cord is approximately 3.62 cubic meters. Our calculator includes a metric mode to handle this conversion automatically.

Does the air space count in the calculation?

Yes. The legal definition of a cord includes the air between tightly stacked logs. However, the air should not be excessive. Large gaps meant to artificially inflate volume are deceptive.

How many pickup truck loads equal a cord?

A standard full-size pickup truck with an 8-foot bed can hold about 1/2 of a cord if thrown in loosely, or slightly more if tightly stacked. A small truck (like a Ranger or Tacoma) holds much less, usually 1/4 to 1/3 of a cord.

What is a “Rick” of wood?

“Rick” is a colloquial term that usually refers to a face cord, but it is not a standardized legal measure. Always ask for dimensions in feet when buying a “rick.”

Why does the calculator ask for price?

This allows you to verify if you are getting a fair deal. If you paid $300 for a “cord” but the calculator shows you only have 0.75 cords, you effectively paid $400 per full cord.

How should I stack wood for accurate measurement?

Stack wood on level ground, logs parallel to each other, as tightly as possible without forcing them. This ensures your stacking technique yields an accurate volume measurement.

Related Tools and Internal Resources

Enhance your firewood knowledge with these related tools and guides:

• Firewood Moisture Content Guide
  Understanding how to measure moisture for optimal burning efficiency.
• Best Wood for Burning Chart
  Compare BTU values of Oak, Maple, Pine, and other species.
• How to Stack Firewood Properly
  Techniques to ensure stability and proper airflow for seasoning.
• Seasoning Firewood Timeline
  How long different species need to dry before use.
• BTU Heat Value Calculator
  Calculate the heat output of your specific wood pile.
• Face Cord vs. Full Cord Guide
  A detailed visual comparison of firewood measurements.