# Deck Materials Calculator — Canada

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

Page: https://askcalculators.com/ca/deck/
Definition: https://askcalculators.com/ca/deck/definition.json
JSON Schema: https://askcalculators.com/ca/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/ca/deck/?unitSystem=metric&length=5&width=4&boardWidth=140&boardGap=5&stockLength=4.8&joistSpacing=400&postSpacing=2&footingDiameter=300&footingDepth=1&wastePercent=10&unitRate=0&laborCost=0&deliveryCost=0&otherCost=0&costMultiplier=1&spreadPercent=15&taxRate=0

## Inputs
- unitSystem: Measurement system; type=select; optional; default=metric; values=imperial|metric
- length: Length; type=number; required; default=5; min=0.001; max=1000000000000
- width: Width; type=number; required; default=4; min=0.001; max=1000000000000
- boardWidth: Actual deck-board face width; type=number; required; default=140; min=1; max=1000000000000
- boardGap: Clear gap between boards; type=number; required; default=5; min=0; max=50
- stockLength: Available stock-board length; type=number; required; default=4.8; min=0.1; max=1000000000000
- joistSpacing: Selected joist spacing; type=number; required; default=400; min=50; max=1000
- postSpacing: Selected post spacing; type=number; required; default=2; min=0.1; max=1000000000000
- footingDiameter: Specified round footing diameter; type=number; required; default=300; min=1; max=1000000000000
- footingDepth: Specified footing depth; type=number; required; default=1; min=0.01; max=1000000000000
- 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.