Deck Board Calculator
If boards run across a joist bay width, enter run length and board face width to estimate piece count.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Run length is the direction boards travel. Board width is face measurement.
What the math is doing
Pieces = ceil(run length ÷ board width in feet) with waste.
Frequently asked questions
Butt joints?
Add extra pieces for staggered joints.
Breaker boards?
Treat as separate runs.
Breaker vs continuous?
Continuous runs reduce cuts.
Gapping?
Slightly narrower effective width; increase waste.