Firewood Calculator
Measure your stacked firewood to determine the total volume in cords. Enter the dimensions of your woodpile below.
The total length of the woodpile.
The average height of the woodpile.
The average width (log length) of the woodpile.
Select the unit you used for your measurements.
Calculation Results
Total Volume: 0 cubic feet
Formula: (L × H × W) / 128 = Cords
Volume Comparison
What is a Firewood Calculator?
A firewood calculator is a tool designed to estimate the volume of a stack of firewood, typically measured in a unit called a “cord”. Since firewood is rarely sold as individual logs, measuring a stacked pile is the standard method for quantifying your supply. This calculator helps you verify you received the amount of wood you paid for or determine how much wood you have on hand for the winter. A standard cord of wood is a legally defined unit of volume, equal to 128 cubic feet.
Firewood Calculator Formula and Explanation
The calculation is based on the standard formula for the volume of a rectangular prism, which is then converted into cords. The formula is:
Volume in Cords = (Stack Length × Stack Height × Stack Width) / 128
It’s crucial that all measurements are in feet before applying the formula, as a cord is defined in cubic feet. Our firewood calculator handles the unit conversions for you automatically. If you measure in meters, the volume is divided by approximately 3.6246 to convert to cords.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Stack Length | The horizontal length of the woodpile. | feet / meters | 4 – 50 ft |
| Stack Height | The vertical height of the woodpile. | feet / meters | 2 – 8 ft |
| Stack Width | The depth of the pile, usually the length of the logs. | feet / meters | 1.33 – 4 ft (16-48 inches) |
| Cord | A standard measure of firewood volume. | 128 cubic feet | 0.25 – 5 |
Practical Examples
Example 1: Standard Full Cord
A standard full cord of wood is typically stacked 4 feet high, 8 feet long, with logs that are 4 feet deep.
- Inputs: Length = 8 ft, Height = 4 ft, Width = 4 ft
- Calculation: (8 × 4 × 4) / 128 = 128 / 128
- Result: 1 Cord
Example 2: A “Face Cord” or “Rick”
Often, firewood is sold in a stack that is 8 feet long and 4 feet high, but the logs are only 16 inches (or 1.33 feet) long. This is known as a face cord or rick. To see how much that is, you can check a cord of wood dimensions guide.
- Inputs: Length = 8 ft, Height = 4 ft, Width = 1.33 ft
- Calculation: (8 × 4 × 1.33) / 128 = 42.56 / 128
- Result: 0.33 Cords (or 1/3 of a full cord)
How to Use This Firewood Calculator
- Measure Your Stack: Use a tape measure to find the average length, height, and width of your woodpile. For uneven stacks, take measurements at several points and average them.
- Select Units: Choose the unit of measurement you used (feet, inches, or meters) from the dropdown menu.
- Enter Dimensions: Input your averaged measurements into the corresponding fields. The calculator will update in real time.
- Interpret Results: The calculator displays the total volume in cords, as well as the total cubic feet. The chart provides a quick visual reference. For insights on how much energy your wood holds, a BTU calculator can be useful.
Key Factors That Affect Firewood Volume
- Stacking Tightness: The amount of air space in a stack can significantly alter the actual wood volume. A tightly packed stack has more wood than a loosely thrown pile. The legal definition of a cord assumes a “neatly stacked” pile.
- Log Shape: Straight, uniform, split logs will pack more tightly than crooked, round, and knotty pieces of wood.
- Log Length: While a standard cord has 4-foot logs, most firewood is cut to 16 or 24 inches. Be sure to measure the actual average log length for the “width” dimension.
- Settling: A pile of wood will settle over time, reducing its height. It’s best to measure wood shortly after it has been stacked. For proper burning, consulting a guide to seasoning wood is highly recommended.
- Measurement Averaging: Stacks are rarely perfect rectangles. Taking multiple measurements for height and length and averaging them provides a more accurate input for the firewood calculator.
- Loose Piles: A pile of wood dumped from a truck is not a cord. It must be stacked to be measured accurately. A loose pile can take up nearly twice the space of a stacked cord.
Frequently Asked Questions (FAQ)
A cord is a standard unit of volume for firewood, equal to a stack that measures 128 cubic feet. This is most often visualized as a pile 4 feet high, 4 feet deep, and 8 feet long (4x4x8).
2. What is a face cord or rick?
A “face cord” (or “rick”) is a term for a stack of wood that is 4 feet high and 8 feet long, but its depth is the length of the firewood logs, typically 16 inches. A face cord is therefore one-third of a full cord.
3. How do I handle measurements in inches?
Our firewood calculator automatically converts inches to feet for you. Just select “Inches” from the unit dropdown. Internally, it divides the inch measurement by 12 to get feet before calculating volume.
4. Does the type of wood affect the cord measurement?
No, a cord is a measure of volume, not weight or density. A cord of dense hardwood like oak and a cord of lighter softwood like pine occupy the same 128 cubic foot space. However, the energy output will differ, which you can learn about with an article on wood stove efficiency.
5. How many logs are in a cord?
There is no exact number, as it depends entirely on the size of the logs. A cord could contain anywhere from 600 to 800 smaller logs or fewer, much larger logs.
6. What if my stack is not a perfect rectangle?
For an oddly shaped pile, try to visualize it as multiple rectangular sections. Calculate the volume of each section with the firewood calculator and add the results together. Alternatively, take several measurements for each dimension and use the average.
7. Why is my calculated volume different from what the seller claimed?
This can be due to several reasons: loose stacking, inaccurate initial measurements, or a misunderstanding of terms (e.g., you bought a “face cord” thinking it was a “full cord”). Always confirm dimensions and terms before purchasing. Efficient stacking firewood techniques are essential for accurate measurement.
8. Can I use this calculator for a loose pile of wood?
No, this calculator is for stacked wood. A loose pile that has been dumped has a significant amount of air space and cannot be measured accurately for cords until it is stacked.
Related Tools and Internal Resources
Understanding your firewood is key to efficient heating. Explore these resources to learn more:
- Cord of Wood Dimensions: A detailed look at the different ways a cord can be stacked.
- BTU Calculator: Estimate the heat output of different types of wood.
- Cost of Firewood Estimator: Compare prices and determine the value of your firewood.
- Guide to Seasoning Wood: Learn the importance of drying wood for a better burn.
- How to Stack Firewood: Best practices for stacking wood to promote drying and ensure stability.
- Wood Stove Efficiency Guide: Get the most heat out of your wood with these tips.