About the Stair Flooring Calculator
Flooring material needed to cover stairs, including treads, risers and nosings.
Also known as: stair carpet calculator, staircase flooring, stair covering material, carpet for stairs.
How to use this calculator
- Enter number of steps, tread depth, riser height, stair width 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
area = (tread + riser + nosing) × width × steps × (1 + waste)
Worked example
Using the values pre-filled in the calculator above:
- Number of steps = 13
- Tread depth = 250 mm
- Riser height = 180 mm
- Stair width = 900 mm
- Cover: Treads and risers
- Waste allowance = 12 %
- Price per m² = 30
the calculator returns:
- Material required: 6.159 m²
- Area per step: 0.423 m²
- Running length needed: 6.11 m
- Nosings: 13