Staricase carpet area?

What is the average surface area for a staircase excluding landing?
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Rough guestimate: 30" wide by 12 to 14 treads each needing 17 or 18" per tread assuming no 'winder' treads
Andrew Mawson
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This is a good site to calculate stair carpet http://www.carpet-index.com/ci/diy/MeasuringImperial/MeasuringHSLI.htm

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