How many treads do I need for a staircase?

The number of treads is typically one less than the number of risers for a straight staircase. For a standard UK storey height of 2600mm with 190mm risers, you need approximately 13-14 risers and 12-13 treads.

What timber do I need for staircase stringers?

Stringers are typically cut from 250mm or 300mm wide boards, usually 38-50mm thick softwood. The length is calculated as the hypotenuse of the total rise and total going.

What are winder treads?

Winders are triangular treads used to create a turn in the staircase instead of a landing. They are commonly used for quarter-turn and half-turn stairs to save space.

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Staircase Material Calculator — Treads, Risers & Stringers

Calculate the materials list for building a staircase. Get quantities for treads, risers, stringers, newel posts and handrail.

Floor-to-Floor Height

Total vertical rise

Going per Tread

Horizontal depth of each tread (min 220mm Part K)

Staircase Width

Width between strings

Number of Winders

0 for straight staircase, 3 for quarter turn

How We Calculate This

This calculator determines the number of risers from your floor-to-floor height, then calculates all timber materials needed including treads, risers, stringers and fittings.