Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Waterfall-style strip length; carpet width, pattern repeats, nosing shape and landing pieces are separate.
Example Calculation
- Covered steps: 12
- Tread depth: 0.28 m
- Riser height: 0.18 m
- Extra wrap per step: 0.04 m
- Top/bottom allowance: 0.3 m
Covered steps = 12; Tread depth = 0.28 m; Riser height = 0.18 m; Extra wrap per step = 0.04 m; Top/bottom allowance = 0.3 m. Primary result: 6.3.
Frequently asked questions
How do I use this calculator?
Enter covered steps, tread depth, riser height, extra wrap per step, top/bottom allowance. The result updates automatically. Use Reset to restore the example values.
What method does it use?
strip length=steps ×(tread+riser+wrap)+end allowance.. Waterfall-style strip length; carpet width, pattern repeats, nosing shape and landing pieces are separate.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.