Cord of Wood Calculator
An expert tool to accurately calculate the volume of your firewood.
Measure Your Firewood Stack
A standard cord of wood has a volume of 128 cubic feet. This calculator uses the formula: Cords = (Length × Width × Height) / 128.
Volume Comparison
This chart compares your stack’s calculated volume to the volume of a standard full cord (128 cu ft).
Common Firewood Measurements
| Unit | Typical Dimensions | Volume (Cubic Feet) | Description |
|---|---|---|---|
| Full Cord | 4′ H x 8′ L x 4′ D | 128 cu ft | The official, legal measurement for firewood in most areas. |
| Face Cord (Rick) | 4′ H x 8′ L x 16″ D | ~42.7 cu ft | One-third of a full cord, based on standard 16-inch log lengths. |
| Half Cord | 4′ H x 4′ L x 4′ D | 64 cu ft | Exactly half the volume of a full cord. |
| Truck Bed (8ft) | ~2′ H x 8′ L x 5.5′ W | ~60-70 cu ft (loosely thrown) | Roughly equivalent to a half cord, but varies greatly. |
Note: The actual solid wood in a cord is about 85 cubic feet; the rest is air space.
What is a Cord of Wood?
A “cord” is the official unit of measurement for firewood in the United States and Canada. When you purchase firewood, a cord of wood refers to a specific volume, ensuring a fair transaction. Officially, a cord is a well-stacked pile of wood that occupies a volume of 128 cubic feet. The most common dimensions for a cord are 4 feet high, 4 feet deep, and 8 feet long (4′ x 4′ x 8′). Anyone who buys, sells, or uses significant amounts of firewood—from homeowners with wood stoves to commercial sellers—should use this standard. A common misconception is confusing a “full cord” with a “face cord.” A face cord is much smaller, representing only a fraction of a full cord, a fact our Cord of Wood Calculator helps clarify.
Cord of Wood Formula and Mathematical Explanation
The calculation for determining the number of cords in a stack of wood is based on simple volumetric measurement. The goal is to find the total cubic feet of your stack and compare it to the standard 128 cubic feet of a full cord. The formula is:
Volume in Cubic Feet = Length (ft) × Width (ft) × Height (ft)
Once you have the total volume, you use the following formula which our Cord of Wood Calculator automates:
Number of Cords = Total Volume in Cubic Feet / 128
This process is essential for anyone needing to calculate a cord of wood accurately.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Length (L) | The longest dimension of the woodpile. | Feet (ft) | 4 – 50 ft |
| Width (W) | The depth of the woodpile (log length). | Feet (ft) | 1.33 – 4 ft (16″ to 48″) |
| Height (H) | The vertical dimension of the woodpile. | Feet (ft) | 2 – 6 ft |
| Total Volume (V) | The space occupied by the stack (L × W × H). | Cubic Feet (cu ft) | 32 – 500+ cu ft |
Practical Examples (Real-World Use Cases)
Understanding how to calculate a cord of wood is easier with examples.
Example 1: The Standard Stack
A homeowner buys a load of firewood and stacks it neatly. The pile measures 8 feet long, 4 feet wide, and 4 feet high.
- Inputs: L=8 ft, W=4 ft, H=4 ft
- Calculation: (8 × 4 × 4) = 128 cubic feet
- Result: 128 / 128 = 1.0 Full Cord. The seller delivered the correct amount.
Example 2: The Long, Short Stack
Someone stacks wood along a fence. The pile is 16 feet long and 4 feet high, but the pieces are only 24 inches (2 feet) long.
- Inputs: L=16 ft, W=2 ft, H=4 ft
- Calculation: (16 × 2 × 4) = 128 cubic feet
- Result: 128 / 128 = 1.0 Full Cord. Even though the dimensions aren’t standard, the volume is correct. Our Cord of Wood Calculator handles these custom dimensions easily.
How to Use This Cord of Wood Calculator
Our tool makes it simple to calculate a cord of wood. Follow these steps:
- Measure Your Stack: Use a tape measure to get the length, width (depth), and average height of your firewood pile.
- Enter Dimensions: Input these numbers into the “Stack Length,” “Stack Width,” and “Stack Height” fields.
- Select Units: Choose whether your measurements are in feet or inches. The calculator will handle the conversion.
- Read the Results: The calculator instantly shows the total volume in cubic feet and the equivalent number of full cords and face cords. This is crucial when verifying a purchase or estimating your supply. For more details on wood types, see our wood species comparison guide.
Key Factors That Affect Cord Measurement Results
Several factors can influence the actual amount of wood you receive, even if the volume seems correct. Our Cord of Wood Calculator provides the volume, but you must consider these physical factors.
- Stacking Tightness: A cord must be “well-stowed.” Loosely thrown piles contain more air and less wood. Always measure wood after it has been stacked neatly.
- Log Shape: Straight, uniform, split logs stack tighter than crooked, round logs. Irregular pieces increase air space, reducing the solid wood volume.
- Log Length: The width/depth of your pile is determined by log length. A face cord’s volume is entirely dependent on this. Using a log splitter calculator can help you plan for consistent sizes.
- Varying Height: A woodpile rarely has a perfectly flat top. Measure the height in several places and use the average for an accurate calculation.
- Debris and Bark: Excess bark, dirt, or debris included in the stack takes up space without providing usable wood.
- Settling: A newly stacked pile will settle over time, slightly reducing its height and overall measured volume. It’s best to measure after a week of settling if possible.
Frequently Asked Questions (FAQ)
- 1. What’s the difference between a full cord and a face cord?
- A full cord is legally defined as 128 cubic feet. A face cord is a stack 4 feet high by 8 feet long, but its depth is only the length of one piece of firewood (typically 16 inches). A 16-inch face cord is therefore 1/3 of a full cord.
- 2. How many pieces of wood are in a cord?
- This varies widely based on log size, but a full cord can contain anywhere from 600 to 800 pieces of wood.
- 3. How do I measure a loose pile of wood from a truck?
- You can’t accurately measure a loose pile. To use a Cord of Wood Calculator correctly, the wood must be stacked. A loose pile has far more air space. Some estimates exist, but they are not reliable for a transaction.
- 4. Is a “rick” of wood the same as a face cord?
- Yes, in most regions, the terms “rick” and “face cord” are used interchangeably to describe a stack of wood that is 4 ft high, 8 ft long, and the length of a single log deep.
- 5. Does it matter if the dimensions are not exactly 4x4x8?
- No. Any combination of dimensions that multiplies to 128 cubic feet is a valid cord. For example, a stack that is 4 ft high, 2 ft deep, and 16 ft long is also a full cord (4 x 2 x 16 = 128). This is why a reliable Cord of Wood Calculator is so valuable.
- 6. Why is it important to calculate a cord of wood?
- It ensures you are getting the amount of firewood you paid for. Since firewood can be expensive, verifying the volume is a smart consumer practice. It also helps in planning how long your wood supply will last. Check our guide on seasoning firewood for maximum efficiency.
- 7. How much does a cord of wood weigh?
- Weight is not a standard for selling firewood because it varies dramatically with wood species and moisture content. A cord of green (wet) oak can weigh over 5,000 lbs, while a dry cord might weigh 3,500 lbs.
- 8. Does a cord of green wood have the same volume as a cord of dry wood?
- Yes, the volume (128 cubic feet) is the same. However, the weight and heating value are very different. Dry, seasoned wood produces much more heat per volume. Our Cord of Wood Calculator helps you measure the volume, which is the standard for sales.
Related Tools and Internal Resources
Expand your knowledge and planning capabilities with our other specialized calculators and guides:
- Tree Volume Calculator: Estimate the amount of lumber or firewood in a standing tree before you cut it.
- Cost of Firewood Calculator: Compare prices and determine the best value when purchasing firewood by the cord or truckload.
- Firewood BTU Chart: A detailed comparison of the heat output from different wood species to help you choose the best type for your needs.
- Log Splitter Tonnage Calculator: Determine the right amount of force needed to split different types of wood efficiently.