Cord of Firewood Calculator

What is a Cord of Firewood?

A cord of firewood is a standard unit of measurement for stacked wood, primarily used in the United States and Canada. By definition, a full cord measures 128 cubic feet of stacked wood. This isn't just solid wood; it includes the air space between the logs, which is crucial for understanding its actual content.

Typically, a cord is stacked 8 feet long, 4 feet high, and 4 feet deep (the length of the logs). This forms a rectangular prism. While these dimensions are standard, any stack of wood that totals 128 cubic feet is considered a cord. For example, a stack 16 feet long, 4 feet high, and 2 feet deep would also be one cord.

Who should use a cord of firewood calculator?

• Homeowners buying or selling firewood to ensure they get or give the correct quantity.
• Firewood suppliers for accurate inventory management and pricing.
• Outdoor enthusiasts planning for camping or heating needs.
• Anyone looking to understand the volume and potential cost of their woodpile.

Common Misunderstandings:

• Face Cord vs. Full Cord: A common confusion arises with a "face cord." A face cord is usually 8 feet long and 4 feet high, but its depth is determined by the length of the individual logs (e.g., 16 inches or 24 inches), making it less than a full cord. A face cord of 16-inch logs is only about one-third of a full cord. Our cord of firewood calculator helps clarify these differences by letting you input exact stack dimensions.
• Solid Wood vs. Stacked Volume: The 128 cubic feet refers to the total stacked volume, including air. The actual solid wood content is typically 70-85% of this volume, depending on log straightness, length, and how tightly it's stacked.

Cord of Firewood Formula and Explanation

Calculating the number of cords in a stack of firewood is a straightforward volume calculation. The core principle is to find the total cubic volume of your stack and then divide it by the standard volume of a cord.

The Formula:

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

Where all dimensions (Length, Width, Height) must be in feet to align with the 128 cubic feet per cord standard.

Variable Explanations:

Practical Examples

Example 1: Measuring a Large Wood Shed

Imagine you have a woodshed that is 12 feet long, where you stack logs that are 18 inches long (which is 1.5 feet), and your stack reaches a height of 6 feet.

• Inputs:
  • Pile Length: 12 feet
  • Pile Width: 1.5 feet (18 inches)
  • Pile Height: 6 feet
  • Cost Per Cord: $280
• Calculation:
  • Total Volume = 12 ft × 1.5 ft × 6 ft = 108 cubic feet
  • Total Cords = 108 cu ft / 128 cu ft/cord = 0.84375 cords
  • Total Cost = 0.84375 cords × $280/cord = $236.25
• Results: This stack contains approximately 0.84 cords of firewood, costing you $236.25.

Example 2: Converting Metric Measurements

Suppose you're in a region using metric units and measure your stack as 3 meters long, 1 meter wide (for logs), and 2 meters high. The price is €150 per cord.

• Inputs:
  • Pile Length: 3 meters
  • Pile Width: 1 meter
  • Pile Height: 2 meters
  • Cost Per Cord: €150
  • Selected Unit: Meters
• Internal Conversion (to feet):
  • 1 meter ≈ 3.28084 feet
  • Pile Length (ft) = 3 m × 3.28084 ft/m = 9.84252 ft
  • Pile Width (ft) = 1 m × 3.28084 ft/m = 3.28084 ft
  • Pile Height (ft) = 2 m × 3.28084 ft/m = 6.56168 ft
• Calculation:
  • Total Volume = 9.84252 ft × 3.28084 ft × 6.56168 ft ≈ 212.18 cubic feet
  • Total Cords = 212.18 cu ft / 128 cu ft/cord ≈ 1.657 cords
  • Total Cost = 1.657 cords × €150/cord = €248.55
• Results: Your metric stack amounts to approximately 1.66 cords, with an estimated cost of €248.55. The calculator handles these unit conversions automatically.

How to Use This Cord of Firewood Calculator

Our cord of firewood calculator is designed for ease of use and accuracy. Follow these simple steps to get your firewood measurements:

1. Select Your Units: At the top of the calculator, choose your preferred measurement system: "Feet" or "Meters." This will automatically adjust the input labels and helper texts.
2. Enter Pile Length: Measure the total horizontal length of your stacked firewood. Input this value into the "Pile Length" field.
3. Enter Pile Width (Log Length): Measure the depth of your stack. This is usually the length of your individual logs (e.g., 16 inches, 20 inches, or 24 inches). Convert inches to feet if necessary (e.g., 16 inches = 1.33 feet). Input this into the "Pile Width" field.
4. Enter Pile Height: Measure the vertical height of your firewood stack. Input this into the "Pile Height" field.
5. Enter Cost Per Cord (Optional): If you know the price of one full cord of firewood, enter it into the "Cost Per Cord" field to get an estimated total cost.
6. View Results: As you type, the calculator will automatically update the "Calculation Results" section, showing you the total cords, total volume in both cubic feet and cubic meters, and the estimated total cost.
7. Interpret Results: The primary result shows the total cords. You'll also see intermediate values like total cubic feet/meters and the total estimated cost. Use the "Formula Used" explanation to understand the calculation logic.
8. Copy Results: Click the "Copy Results" button to quickly copy all calculated values and assumptions to your clipboard for easy sharing or record-keeping.
9. Reset: If you want to start over, click the "Reset" button to clear all inputs and revert to default values.

Always ensure your measurements are accurate for the best results from the firewood volume calculator.

Key Factors That Affect Firewood Quantity & Cost

Understanding the factors that influence firewood quantity and cost can help you make more informed decisions when buying or selling wood.

1. Stacking Density: How tightly the wood is stacked significantly impacts the actual solid wood volume within a cord. Neatly stacked, uniform logs will yield more solid wood than haphazardly thrown piles. This affects the "true" value of a cord.
2. Log Length: While a cord is 128 cubic feet of stacked volume, the standard log length is 4 feet. Shorter logs (e.g., 16 or 18 inches) often lead to more air space in a stack, meaning less solid wood per "face cord." Our cord of firewood calculator helps account for this by letting you specify pile width.
3. Wood Type: Different species of wood have varying densities and BTU (British Thermal Unit) values. Hardwoods like oak, maple, and hickory are denser and produce more heat per cord than softwoods like pine or fir. This impacts the "value" of a cord beyond just its volume. For more on this, check out a wood BTU calculator.
4. Moisture Content (Seasoning): "Green" or unseasoned wood has high moisture content, burns poorly, and produces less heat and more smoke. Seasoned wood (dried for 6-12 months) is lighter, burns hotter, and is generally more expensive per cord but offers better value.
5. Delivery and Handling: The cost of transporting firewood from the supplier to your location can significantly add to the per-cord price. Factors like distance, accessibility, and whether the wood is stacked or dumped affect the final price.
6. Region and Local Market: Firewood prices can vary widely by geographic region due to local supply and demand, transportation costs, and common wood types available. Urban areas often have higher prices than rural areas.
7. Time of Year: Firewood prices typically increase as winter approaches due to higher demand. Buying in the spring or summer often yields better prices.
8. Processing (Split vs. Unsplit): Split firewood is usually more expensive than unsplit rounds because of the labor involved in processing. Split wood also seasons faster and is easier to handle and burn.