# Deck Materials Calculator — United States

> Prepare a transparent takeoff for a simple rectangular deck layout with two support rows. USD planning view; stated limitations apply.

Page: https://askcalculators.com/us/deck/
Definition: https://askcalculators.com/us/deck/definition.json
JSON Schema: https://askcalculators.com/us/deck/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/us/deck/?unitSystem=imperial&length=16.404199475065617&width=13.123359580052492&boardWidth=5.511811023622047&boardGap=0.1968503937007874&stockLength=15.74803149606299&joistSpacing=15.748031496062993&postSpacing=6.561679790026246&footingDiameter=11.811023622047244&footingDepth=3.280839895013123&wastePercent=10&unitRate=0&laborCost=0&deliveryCost=0&otherCost=0&costMultiplier=1&spreadPercent=15&taxRate=0

## Inputs
- unitSystem: Measurement system; type=select; optional; default=imperial; values=imperial|metric
- length: Length; type=number; required; default=16.404199475065617; min=0.0032808398950131233; max=3280839895013.123
- width: Width; type=number; required; default=13.123359580052492; min=0.0032808398950131233; max=3280839895013.123
- boardWidth: Actual deck-board face width; type=number; required; default=5.511811023622047; min=0.03937007874015748; max=39370078740.157486
- boardGap: Clear gap between boards; type=number; required; default=0.1968503937007874; min=0; max=1.968503937007874
- stockLength: Available stock-board length; type=number; required; default=15.74803149606299; min=0.32808398950131235; max=3280839895013.123
- joistSpacing: Selected joist spacing; type=number; required; default=15.748031496062993; min=1.968503937007874; max=39.37007874015748
- postSpacing: Selected post spacing; type=number; required; default=6.561679790026246; min=0.32808398950131235; max=3280839895013.123
- footingDiameter: Specified round footing diameter; type=number; required; default=11.811023622047244; min=0.03937007874015748; max=39370078740.157486
- footingDepth: Specified footing depth; type=number; required; default=3.280839895013123; min=0.03280839895013123; max=3280839895013.123
- wastePercent: Cutting/waste allowance; type=percent; required; default=10; min=0; max=100
- unitRate: Material price per deck board; type=money; required; default=0; min=0; max=1000000000000
- laborCost: Total labor allowance; type=money; required; default=0; min=0; max=1000000000000
- deliveryCost: Delivery allowance; type=money; required; default=0; min=0; max=1000000000000
- otherCost: Other fixed costs; type=money; required; default=0; min=0; max=1000000000000
- costMultiplier: Material/labor multiplier; type=number; required; default=1; min=0.1; max=10
- spreadPercent: Low/high sensitivity around the entered total; type=percent; required; default=15; min=0; max=100
- taxRate: Explicit tax allowance; type=percent; required; default=0; min=0; max=100

## Outputs
- boardRows: Board rows; format=number
- boards: Whole stock boards; format=number
- joists: Layout joists; format=number
- posts: Posts in two support rows; format=number
- footingVolume: Round-footing concrete volume; format=number
- materialCost: Material cost; format=currency
- laborCost: Labor allowance; format=currency
- deliveryCost: Delivery allowance; format=currency
- otherCost: Other specified costs; format=currency
- tax: Entered tax allowance; format=currency
- low: Low cost scenario; format=currency
- mid: Middle cost scenario; format=currency; primary
- high: High cost scenario; format=currency

## Formula
board rows = ceiling(deck width ÷ (board face + gap)); stock boards = ceiling(rows × deck length × waste factor ÷ stock length).

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.