Virginia reference included
The 2021 Virginia Residential Code lists an 8 1/4-inch maximum riser and 9-inch minimum tread for residential stairs.
Free contractor tool
Stair Rise & Run Calculator
Turn a total rise into an even stair layout before you mark a stringer.
Equal risersTotal runVirginia reference
Rise and run
Enter the total vertical rise. The calculator chooses enough equal risers to stay at or below the selected reference maximum.
Planning aid only. Stair rules vary by adopted code, occupancy, landings, nosings, headroom and local amendments. Verify the permit set and local requirements before cutting stringers.
Side-view sketch
A proportional planning sketch of the rise and run.
Uniformity still matters
A calculator can divide the rise evenly, but field conditions, finish flooring and landing elevations must be measured carefully.
Verify before cutting
This tool does not replace local code review, structural details, headroom checks, guards, handrails or permit drawings.