Deck Block Calculator
Approximates blocks on a rectangular grid using pier spacing along length and width.
Reviewed by MaterialNeeded Editorial Team, Editorial review for field workflows and ordering assumptions.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
How to use this calculator
Enter deck footprint and spacing between pier centers in both directions.
What the math is doing
Blocks ≈ (ceil(L/sx)) × (ceil(W/sy)).
Frequently asked questions
Beam overhang?
Add perimeter blocks manually.
Frost depth?
Follow local post depth tables.
Titan blocks?
Brand-specific layouts differ.
Cantilever?
Engineering outside this count.