Calculate Cord of Wood Calculator
Determine the exact volume of your firewood stack in full cords, face cords, and cubic feet. Enter your stack dimensions below to instantly calculate cord of wood volume and estimated value.
One full cord equals exactly 128 cubic feet of tightly stacked wood.
Figure 1: Comparison of your stack volume versus standard cord definitions.
What is Calculate Cord of Wood?
To calculate cord of wood volume is to determine the precise amount of firewood contained in a stack. This measurement is critical for both buyers and sellers to ensure fair transactions. A “cord” is the official standard unit of measurement for firewood in the United States and Canada.
Anyone heating their home with wood, purchasing firewood in bulk, or selling timber should use a reliable method to calculate cord of wood. A common misconception is that a pickup truck load equals a cord; in reality, a standard pickup truck holds only about 1/3 to 1/2 of a full cord, depending on how loosely it is thrown in.
Calculate Cord of Wood Formula and Mathematical Explanation
The math behind the calculation is based on volume. Since wood is stacked in a rectangular prism shape, we calculate the cubic footage and divide by the standard definition of a cord.
The Core Formula:
If you measure in inches, the divisor changes because there are 1,728 cubic inches in a cubic foot (12×12×12).
Variable Definitions
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Length (L) | Horizontal span of the stack | Feet / Inches | 4ft – 20ft+ |
| Height (H) | Vertical rise of the stack | Feet / Inches | 4ft (Standard) |
| Depth (D) | Length of individual logs | Feet / Inches | 16in (Standard) – 24in |
| 128 | Volume of one full cord | Cubic Feet | Constant |
Table 1: Variables used to calculate cord of wood volume.
Practical Examples (Real-World Use Cases)
Example 1: The Standard Backyard Stack
John stacks his firewood along his fence. The stack measures 8 feet long, 4 feet high, and the logs are cut to 16 inches (1.33 feet) in length.
- Calculation: (8 × 4 × 1.33) = 42.6 cubic feet.
- Result: 42.6 / 128 ≈ 0.33 Cords.
- Interpretation: This is exactly one “Face Cord” or “Rick” of wood, which is one-third of a full cord.
Example 2: The Bulk Purchase Verification
Sarah orders 2 full cords of wood for $600. The delivery driver dumps the wood, and she stacks it to verify the amount. Her final stack is 16 feet long, 4 feet high, and 4 feet deep (two rows of 24-inch logs).
- Calculation: (16 × 4 × 4) = 256 cubic feet.
- Result: 256 / 128 = 2.00 Cords.
- Financial Interpretation: The delivery was accurate. If the stack had been shorter, she would have overpaid. At $300/cord, every missing foot of length represents a financial loss.
How to Use This Calculate Cord of Wood Calculator
- Measure Length: Run a tape measure along the entire length of your wood stack. Input feet and remaining inches.
- Measure Height: Measure from the ground to the average top height of the stack.
- Measure Depth: This is typically the length of the firewood pieces (e.g., 16 inches). If you have multiple rows stacked, measure the total depth of all rows combined.
- Enter Price (Optional): If you know the price per cord in your area (e.g., $300), enter it to see the total value of your stack.
- Analyze Results: Look at the “Total Volume (Full Cords)” for the official measurement, or “Face Cords” if you buy by the rick.
Key Factors That Affect Calculate Cord of Wood Results
When you calculate cord of wood volume, several physical and economic factors influence the final accuracy and value:
- Air Space (Void Volume): A “cord” assumes tightly stacked wood. If wood is thrown loosely (a “thrown cord”), the actual wood volume is significantly less, usually by 30-40%.
- Log Length Consistency: If logs vary in length, the stack depth becomes uneven. Always measure the average depth to accurately calculate cord of wood.
- Stacking Technique: Cross-stacking (alternating direction) creates more air gaps, artificially inflating the volume. Calculations assume parallel stacking.
- Wood Species Density: While the volume calculation remains the same, the heating value (BTUs) differs. A cord of Oak is worth more than a cord of Pine, affecting the “Value” metric.
- Moisture Content (Shrinkage): Green wood shrinks as it dries (seasons). A stack measured today may measure slightly less in volume after 6 months of drying.
- Regional Definitions: Terms like “Rick,” “Run,” or “Truckload” are non-standard. Always convert these loose terms to cubic feet to compare prices fairly.
Frequently Asked Questions (FAQ)
1. What is the difference between a Face Cord and a Full Cord?
A full cord is 128 cubic feet (4’×4’×8′). A face cord is 4′ high by 8′ long, but only as deep as the log length (usually 16 inches). Therefore, a face cord is typically 1/3 of a full cord.
2. How do I calculate cord of wood if the stack is triangular?
If your stack is triangular (high in the middle), measure the height at the peak and divide by 2 to get the average height, then use the standard formula.
3. Can I calculate cord of wood from a loose pile?
It is difficult to be precise. A general rule of thumb is that a loose pile takes up about 180 cubic feet to equal 128 cubic feet of stacked wood. You should stack it for an accurate measurement.
4. Is a pickup truck load a full cord?
No. A standard full-size pickup with an 8-foot bed holds about 1/2 cord if stacked neatly, or roughly a face cord if thrown in loosely.
5. Why does the calculator ask for inches?
Firewood is often cut to specific inch lengths (like 16″ or 18″). Using inches allows for higher precision than estimating decimals of a foot.
6. How does log straightness affect the calculation?
Crooked logs create larger air gaps. The legal definition of a cord specifies “tightly stacked,” so crooked wood may result in less actual fuel per cord volume.
7. What is a “Rick” of wood?
“Rick” is often used synonymously with “Face Cord” in the Midwest. It usually refers to a stack 4′ tall by 8′ long with variable log lengths.
8. Does the species of wood change the volume calculation?
No. 128 cubic feet of Oak is the same volume as 128 cubic feet of Pine. However, the weight and energy content will differ significantly.