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.
- Solid fill down to a level base, with n complete treads. Excludes landings and does not model a thin sloping stair slab.
Example Calculation
- Steps: 5
- Uniform rise: 0.15 m
- Uniform tread: 0.3 m
- Width: 1 m
Five 0.15 m rises and 0.3 m treads at 1 m width form 0.675 m³ of solid steps.
Frequently asked questions
How do I use this calculator?
Enter steps, uniform rise, uniform tread, width. The result updates automatically. Use Reset to restore the example values.
What method does it use?
V=width × tread × rise × n(n+1)/2.. Solid fill down to a level base, with n complete treads. Excludes landings and does not model a thin sloping stair slab.
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.