Stair Calculator
Plan stair from project dimensions, material rate, and waste. Use this free stair calculator for fast, clear results with no signup required.
Stair Calculator guide
What it is for
Plan material quantities for stair calculator before purchasing supplies.
How it is calculated
Risers = ceil(total rise / target riser height), with both heights in inches. Actual riser height is total rise divided by that integer count.
Assumptions
The surface is reasonably regular and the dimensions, coverage, and waste represent the real project.
Example
Worked example using the fields in order: 96, 7.75. The calculated primary amount is 13 risers; the secondary value is 7.384615385. Check the units before purchasing.
Limitations
Cuts, openings, packaging, site conditions, and local codes can change the final quantity; confirm with a supplier or professional.