About the Stair Material Calculator
Timber for treads, risers, stringers and the handrail for a staircase.
Also known as: stair timber calculator, staircase materials list, stair wood quantity.
How to use this calculator
- Enter number of risers, stair width, tread depth, riser height and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
tread area = (risers − 1) × (going + nosing) × width
Worked example
Using the values pre-filled in the calculator above:
- Number of risers = 14
- Stair width = 900 mm
- Tread depth = 250 mm
- Riser height = 190 mm
- Closed risers: Yes
- Timber per m² = 60
the calculator returns:
- Total board area: 5.612 m²
- Tread area: 3.218 m²
- Riser area: 2.394 m²
- Treads required: 13