Board Feet Calculator: How to Calculate Lumber Volume

Quick Answer

A board foot is a lumber volume equal to 1 inch thick, 12 inches wide, and 12 inches long.

Use the [Lumber Calculator](/lumber-calculator) to adjust the dimensions, waste factor, product coverage, and unit price for your exact project.

Formula

``

Board feet = thickness(in) x width(in) x length(ft) / 12

``

Example Estimate

1. A board is 2 inches thick, 8 inches wide, and 10 feet long.

2. 2 x 8 x 10 = 160.

3. 160 / 12 = 13.33 board feet.

4. Multiply by price per board foot for cost.

Reference Table

| Board | Length | Board feet |

|---|---:|---:|

| 1x6 | 8 ft | 4 |

| 2x8 | 10 ft | 13.33 |

| 4x4 | 8 ft | 10.67 |

Practical Tips

- Use actual dimensions for precision.

- Rough lumber may measure differently than surfaced lumber.

- Add waste for defects and cuts.

When to Round Up

Round up when the project has cuts, corners, fragile materials, uneven surfaces, delivery minimums, or any chance that matching the same product later will be difficult.

Next Step

Open the [Lumber Calculator](/lumber-calculator), enter your exact numbers, and save the estimate before buying materials.