Deck Framing Quantity Calculator
Count joist lines and planned beam or post quantities. Enter dimensions from a design your local authority accepts.
Your measurements
Editable exampleExample: replace these measurements
Plan quantities
13 joist lines
Shopping list & save options
- Joist lumber before extra
- 156 linear ft
- Beam lumber from your plan
- 32 linear ft
- Post locations from your plan
- 3
- Post cut lengths combined
- 12 ft
- Joist and beam length with extra
- 188 linear ft
Quantity check only. Member sizes, allowable spans, loads, footings and connections must come from an accepted design.
The calculation
- ceil(16 × 12 ÷ 16) + 1 = 13 joist lines for a nonempty rectangle
- 13 × 12 = 156 linear ft of joists
Before ordering, use the deck measurement, board layout & design handoff guide to check the inputs and take the right questions to the supplier. Choose another calculator.
How to plan the quantity
This is a quantity check for a prepared framing plan. Dividing the distance across joists by their spacing gives the bays; adding an edge line gives the joist count.
Beam lines, plies and post locations are entered from the plan. Multiplying their count by their length produces a lumber takeoff without pretending to choose an allowable span.
Keep joist size, species, grade, treatment, beam connections, ledger attachment, lateral support and footings with that plan. Each affects whether a deck design is suitable.
Before you order
- No structural member size, allowable span, footing dimension or load approval is calculated. A quantity result cannot establish that the design is safe.
- The AWC deck guide has stated material, load and jurisdiction limits. Ask the local building department or designer which provisions apply before ordering structural lumber.