How to calculate linear feet
Multiply the number of pieces by the length of each piece.
Linear feet = Quantity × Length per piece
Linear feet example
Ten boards at 8 feet each equal 80 linear feet before adding waste.
Frequently asked questions
What is a linear foot?
One linear foot is simply one foot of length.
Is linear feet the same as square feet?
No. Linear feet measures length, while square feet measures area.
When is linear footage useful?
It is commonly used for lumber, trim, fencing, piping and similar materials.
Using this calculator effectively
Linear feet measures length without considering width or thickness. This calculator totals repeated pieces and can add a waste allowance for materials commonly sold by length.
Common uses
- Estimating trim, molding or lumber length.
- Adding repeated fence, pipe or board lengths.
- Including an allowance for cuts and unusable offcuts.
Tips for a better estimate
- Measure along the actual installation path rather than only the room footprint.
- Separate pieces with different lengths instead of averaging when accuracy matters.
- Use a waste allowance that reflects joints, miters and material defects.
Related calculations
Deck Material Calculator · Board Foot Calculator · Cubic Feet Calculator