Calculate Cord Of Wood

Accurately measure your firewood stack and find out how many cords you have. Use this tool to calculate cord of wood volume based on stack dimensions.

Calculate Cord of Wood Volume

Common Firewood Measurements

Unit	Typical Dimensions (L x W x H)	Volume (cubic feet)	Notes
Full Cord	8ft x 4ft x 4ft	128	Standard measure, tightly stacked.
Face Cord (Rick)	8ft x (12-24in) x 4ft	42.7 – 85.3 (approx)	Width depends on log length (12″, 16″, 18″, 24″).
Half Cord	4ft x 4ft x 4ft or 8ft x 4ft x 2ft	64	Half the volume of a full cord.
Quarter Cord	4ft x 4ft x 2ft or 8ft x 2ft x 2ft	32	Quarter the volume of a full cord.

Standard and common measurements for stacked firewood. Note that a “face cord” varies in volume depending on the length of the wood pieces.

What is Calculate Cord of Wood?

To “calculate cord of wood” means to determine the volume of stacked firewood and express it in “cords,” the standard unit of measurement for firewood in the United States and Canada. A full cord is legally defined as 128 cubic feet of tightly stacked wood, often visualized as a stack 8 feet long, 4 feet wide, and 4 feet high.

Anyone buying, selling, or using firewood should know how to calculate cord of wood to ensure they are getting or giving a fair amount. It’s crucial for homeowners heating with wood, firewood sellers, and even those buying wood for occasional campfires or fireplaces. When you calculate cord of wood, you are verifying the quantity you’ve received or are about to sell.

A common misconception is that a “face cord” or “rick” is the same as a full cord. However, a face cord is typically a stack 8 feet long and 4 feet high, but the width is only the length of the individual pieces of wood (e.g., 16 inches), making it significantly less volume than a full cord. Accurately knowing how to calculate cord of wood helps avoid these misunderstandings.

Calculate Cord of Wood Formula and Mathematical Explanation

The formula to calculate cord of wood is based on the volume of a rectangular prism (the wood stack) and the standard volume of a cord:

1. Calculate the total volume of the wood stack: Multiply the length, width (or depth), and height of the stack, all measured in feet.
   
   Total Volume (cubic feet) = Length (ft) × Width (ft) × Height (ft)
2. Convert total volume to cords: Divide the total volume by 128 (since 1 cord = 128 cubic feet).
   
   Number of Cords = Total Volume (cubic feet) / 128

For example, a stack measuring 8 feet long, 4 feet wide, and 4 feet high has a volume of 8 x 4 x 4 = 128 cubic feet. Dividing by 128 gives 1 cord.

Variables Table

Variable	Meaning	Unit	Typical Range
Length (L)	The longest dimension of the wood stack.	feet (ft)	4 – 20+ ft
Width (W)	The shortest horizontal dimension (depth) of the stack.	feet (ft)	1 – 8 ft
Height (H)	The vertical dimension of the wood stack.	feet (ft)	2 – 6 ft
Total Volume	L × W × H, the total space occupied by the stack.	cubic feet (cu ft)	16 – 500+ cu ft
Number of Cords	Total Volume / 128.	cords	0.1 – 4+

Practical Examples (Real-World Use Cases)

Example 1: Buying Firewood

Sarah is buying firewood advertised as a “full cord.” The delivered stack measures 8 feet long, 4 feet wide, and 3.5 feet high.

Total Volume = 8 ft × 4 ft × 3.5 ft = 112 cubic feet

Number of Cords = 112 / 128 = 0.875 cords.

Sarah realizes the stack is 0.125 cords (or 16 cubic feet) short of a full cord. She can use this calculation to discuss the quantity with the seller.

Example 2: Stacking and Storing

John has cut and split a large pile of wood. He stacks it neatly in a wood shed that is 16 feet long and 4 feet wide. He stacks it to a height of 4 feet.

Total Volume = 16 ft × 4 ft × 4 ft = 256 cubic feet

Number of Cords = 256 / 128 = 2 cords.

John now knows he has prepared 2 full cords of firewood for the winter.

How to Use This Calculate Cord of Wood Calculator

1. Enter Stack Dimensions: Measure the length, width (or average depth if it’s not uniform), and height of your stacked firewood in feet. Enter these values into the “Stack Length”, “Stack Width”, and “Stack Height” fields.
2. View Results Immediately: The calculator instantly updates the “Number of Cords” and “Total Volume” based on your inputs.
3. Understand the Chart: The bar chart visually compares the volume of your stack to the volume of a standard full cord (128 cubic feet).
4. Reset or Copy: Use the “Reset” button to clear the inputs to their default values (8x4x4 feet, 1 cord) or “Copy Results” to copy the main findings to your clipboard.

The results tell you how many cords of wood you have based on the dimensions entered. If you are buying wood, compare the calculated cords to what was advertised. If you are preparing wood, this tells you how much you have accumulated.

Key Factors That Affect Calculate Cord of Wood Results

1. Stacking Method: How tightly the wood is stacked significantly impacts the actual wood volume within the 128 cubic feet space. Loosely stacked wood has more air gaps and less wood fiber. Our calculator assumes reasonably tight stacking.
2. Wood Straightness: Crooked or irregular pieces of wood create more air spaces when stacked, reducing the actual amount of wood in a given volume.
3. Log Length Variation: If the pieces within the stack vary greatly in length, the average width/depth might be harder to determine accurately, affecting the volume calculation.
4. Measurement Accuracy: The precision of your length, width, and height measurements directly impacts the accuracy of the final cord calculation. Measure in several places and average if the stack is uneven.
5. Settling: Over time, a stack of wood may settle, reducing its height and thus the measured volume. It’s best to calculate cord of wood after the stack has settled or just before use.
6. Definition of a Cord: Ensure you are using the standard 128 cubic feet definition. Some regions might use local terms that differ. Always clarify if you’re buying or selling based on a “cord”.
7. Wood Type and Density: While the volume (cord) is the same, the actual heating value (BTUs) and weight of a cord will vary greatly depending on the wood species (e.g., oak vs. pine). A BTU calculator can help here.

Frequently Asked Questions (FAQ)

Q: What is a full cord of wood?

A: A full cord of wood is a volume of 128 cubic feet of tightly stacked firewood. Typically, this is a stack measuring 8 feet long, 4 feet wide, and 4 feet high.

Q: What’s the difference between a full cord and a face cord (rick)?

A: A full cord is 128 cu ft. A face cord is also 8 feet long and 4 feet high, but its width is only the length of one piece of wood (e.g., 16 inches). So, a 16-inch face cord is 1/3 of a full cord (8′ x 4′ x 1.33′ ≈ 42.7 cu ft).

Q: How much wood is in a “truckload”?

A: A “truckload” is not a standard unit of measurement and varies greatly depending on the size of the truck bed and how high it’s loaded. Always ask for dimensions or calculate cord of wood based on stacked measurements.

Q: Does the way I stack wood affect the amount?

A: Yes, very much. Tightly stacked wood with minimal air gaps will yield more wood fiber per cord. Loosely “thrown” wood is not a cord.

Q: Should I measure before or after the wood is seasoned?

A: Wood shrinks as it dries (seasons). While the shrinkage is mostly in diameter/width of individual pieces, a stack might settle slightly. Measuring when reasonably dry and settled is best for accuracy regarding wood fiber. Our guide to seasoning firewood explains more.

Q: What are the dimensions of half a cord?

A: Half a cord is 64 cubic feet. It could be a stack 4ft x 4ft x 4ft, or 8ft x 4ft x 2ft, or any other dimensions that multiply to 64.

Q: How do I measure an uneven stack?

A: Try to average the height and width. Measure the height at several points and average them. Do the same for the width if it’s not consistent.

Q: Does wood type matter when I calculate cord of wood?

A: For the *volume* (number of cords), no. 128 cubic feet is a cord regardless of wood type. However, for heating value and weight, wood type matters a lot. Hardwoods like oak are denser and provide more BTUs per cord than softwoods like pine. See our info on best firewood types.

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