Cord of Wood Calculator

An essential tool to measure firewood accurately and ensure you get what you pay for.

1.00 Cords

Total Stack Volume
128.00 ft³

Percentage of Full Cord
100%

Formula: (Length × Width × Height) / 128

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Common firewood measurements and their equivalent volumes.

Measurement Name	Typical Dimensions (H x D x L)	Volume (Cubic Feet)	Equivalent Cords
Full Cord	4 ft x 4 ft x 8 ft	128 ft³	1.0
Half Cord	4 ft x 4 ft x 4 ft	64 ft³	0.5
Face Cord (16″ logs)	4 ft x 1.33 ft x 8 ft	~42.7 ft³	~0.33
Quarter Cord	4 ft x 2 ft x 4 ft	32 ft³	0.25

What is a Cord of Wood?

A “cord” is the official unit of measurement for firewood in the United States and Canada. When you **calculate a cord of wood**, you are measuring volume. A standard, or “full,” cord is a neatly stacked pile of wood measuring 128 cubic feet. This volume is most commonly visualized as a stack that is 4 feet high, 4 feet deep, and 8 feet long (4′ x 4′ x 8′). The term likely originates from the use of a cord or string to measure the stack’s circumference. Anyone buying or selling firewood should understand this measurement to ensure a fair transaction. Misconceptions are common, especially with terms like “face cord” or “rick,” which represent smaller volumes but are often confused with a full cord. To accurately **calculate a cord of wood** is to empower yourself as a consumer.

Cord of Wood Formula and Mathematical Explanation

The mathematics to **calculate a cord of wood** are straightforward. Since a full cord is legally defined as 128 cubic feet of stacked wood, the calculation simply involves finding the volume of your woodpile and comparing it to this standard.

The formula is:

Number of Cords = (Stack Length [ft] × Stack Width [ft] × Stack Height [ft]) / 128

You must measure all dimensions in feet. If you measure in inches, convert to feet by dividing the inch measurement by 12. This formula provides the most reliable way to **calculate a cord of wood** from any rectangular stack.

Breakdown of variables used in the firewood calculation.

Variable	Meaning	Unit	Typical Range
Stack Length (L)	The longest horizontal dimension of the woodpile.	Feet (ft)	4 – 20 ft
Stack Width (W)	The depth of the stack, often the length of individual logs.	Feet (ft)	1.33 (16″) – 4 ft
Stack Height (H)	The vertical dimension of the woodpile.	Feet (ft)	2 – 6 ft
Total Volume	The total cubic space occupied by the stack (L x W x H).	Cubic Feet (ft³)	32 – 256 ft³

Practical Examples (Real-World Use Cases)

Example 1: The Standard Homeowner Stack

A homeowner buys firewood advertised as a “full cord.” After stacking it neatly between two trees, the pile measures 8 feet long, 4 feet high, and averages 4 feet deep.

• Inputs: Length = 8 ft, Width = 4 ft, Height = 4 ft
• Calculation: (8 × 4 × 4) / 128 = 128 / 128 = 1.0 Cords
• Interpretation: The homeowner received exactly one full cord of wood, a fair transaction. This shows the importance to **calculate a cord of wood** upon delivery.

Example 2: Buying from a Pickup Truck

A seller offers a “truckload” of wood. You stack it, and the dimensions are 7 feet long, 4 feet high, but only 2 feet deep because the logs were cut short.

• Inputs: Length = 7 ft, Width = 2 ft, Height = 4 ft
• Calculation: (7 × 2 × 4) / 128 = 56 / 128 = 0.44 Cords
• Interpretation: The “truckload” is actually less than half a cord. Knowing how to **calculate a cord of wood** prevents overpaying for loosely defined quantities.

How to Use This Cord of Wood Calculator

Our calculator simplifies the process to **calculate a cord of wood** into a few easy steps:

1. Measure Your Stack: Using a tape measure, find the length, width (depth), and average height of your neatly stacked firewood pile. For uneven piles, take measurements at several points and average them.
2. Enter the Dimensions: Input your measurements (in feet) into the corresponding fields: “Stack Length,” “Stack Width,” and “Stack Height.”
3. Read the Results Instantly: The calculator automatically provides the total cords as the primary result. It also shows the total cubic volume of your stack and what percentage of a full cord it represents.
4. Decision-Making: Use these results to verify a purchase, estimate your winter supply, or determine how much more wood you need to order. Being able to quickly **calculate a cord of wood** is a valuable skill for any firewood user.

Key Factors That Affect Cord of Wood Results

While the formula is simple, several real-world factors can influence the actual amount of wood you receive. It’s not just about the math to **calculate a cord of wood**, but also the quality.

• Stacking Method: A tightly stacked pile with minimal gaps contains more wood than a loosely thrown pile of the same dimensions. Official measurements require the wood to be “racked and well stowed.”
• Log Shape and Size: Straight, uniform logs will pack more tightly than crooked, gnarled pieces, which create large air pockets. More air means less wood for the same volume.
• Moisture Content (Seasoning): While volume is the primary measure, weight can be an indicator. Green wood is heavy with water, while seasoned wood is lighter. A cord of green hardwood can weigh over 4,500 lbs, while a dry cord may be closer to 3,000 lbs.
• Air Space: The 128 cubic foot measurement includes the air between the logs. The actual solid wood in a cord is typically closer to 85-90 cubic feet. Tighter stacking minimizes this air space.
• “Face Cord” vs. “Full Cord”: This is the most common point of confusion. A face cord is a stack 4 ft high by 8 ft long, but its depth is only the length of one log (e.g., 16 inches). A 16-inch face cord is only one-third of a full cord. Always clarify if the price is for a full cord.
• Bark Thickness: Thick bark can take up volume without contributing burnable wood. Certain species have much thicker bark than others, slightly affecting the solid wood content.

Frequently Asked Questions (FAQ)

1. How many logs are in a cord of wood?

This varies greatly depending on the log diameter and length, but a full cord can contain anywhere from 600 to 800 pieces for standard 16-inch logs.

2. How do I measure a pile that isn’t stacked?

It’s extremely difficult. A loose pile has significant air space. For a fair sale, the wood should be stacked. A loose pile occupying 180 cubic feet might stack down to only 128 cubic feet (a full cord).

3. What is a “rick” of wood?

A “rick” is another term for a face cord. Its volume depends entirely on the length of the logs. It’s not a standardized unit, making it crucial to **calculate a cord of wood** based on actual dimensions.

4. How long will a cord of wood last?

This depends on your climate, home insulation, stove efficiency, and how often you burn. For someone who uses wood as a primary heat source in a cold climate, a cord might last 4-8 weeks.

5. Why is it important to **calculate a cord of wood**?

Because firewood is expensive. Without a standard measurement, it’s easy for sellers (intentionally or not) to deliver less wood than you paid for. Calculating ensures you get a fair value.

6. Can I fit a cord of wood in my pickup truck?

Generally, no. A standard 8-foot truck bed, filled to the rails, holds about a half cord. An older long-bed truck with racks might hold close to a full cord, but it’s rare.

7. Does the type of wood affect the cord measurement?

No, a cord is strictly a measure of volume. A cord of oak takes up the same 128 cubic foot space as a cord of pine. However, the cord of oak will be much heavier and produce significantly more heat (BTUs).

8. What are the dimensions of a half cord?

A half cord is 64 cubic feet. A common stack size would be 4 feet high, 4 feet deep, and 4 feet long (4′ x 4′ x 4′).