Boards to buy
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Stair finish material estimator
Stair Tread Calculator
Estimate stair tread boards or tread stock from step count, stair width, boards per tread, stock length, waste, and board cost. Use it after rise/run or deck-stair layout is settled.
Units
Treads covered
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Cut length
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Rough cost
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Treads must meet stair code and product rules
This calculator counts material only. Verify tread depth, nosing, riser uniformity, slip resistance, fastening, stringer support, landings, handrails, and local code before building.
Android App
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Stair Stringer Calculator
Lay out rise, run, and stringer length before counting tread stock.
RelatedDeck Stair Calculator
Estimate deck stair stringers, rise, run, and material.
RelatedStair Handrail Angle Calculator
Find the rail angle and diagonal rail length after stair layout.
Related calculators
View all- StairsStair Stringer CalculatorRiser count, riser height, tread depth, total run, and stringer cut length, with code checks.
- StairsStair Handrail Angle CalculatorCalculate stair handrail angle, rail pitch, diagonal rail length, slope length, and pitch ratio.
- StairsStair Baluster Spacing CalculatorCalculate stair spindle count, equal sloped-rail opening, rail angle, waste, and rough spindle cost from rise and run.
Stair tread board formula
Cut length = steps × stair width × boards per tread
Order length = cut length × (1 + waste %)
Boards to buy = order length ÷ stock board length
Sample takeoff
A 6-step stair that is 4 ft wide, uses two boards per tread, 12 ft stock boards, and 10% waste needs about five boards.
Stair Tread Calculator FAQ
How does this stair tread calculator work?+
It multiplies measured job dimensions by the coverage, spacing, or package yield you enter, adds waste, then rounds the buy quantity up. Set boards per tread to match the stock you will install and verify tread depth with local code.
Should I use the default waste value?+
Use the default for a quick planning estimate, then raise it for cuts, odd layouts, breakage, bad access, or product-specific loss.
Is this a bid or code approval?+
No. It is a material planning calculator. Verify product data, local code, structural requirements, electrical requirements, and supplier packaging before ordering or building.