Stairrise

Plan a straight stair: risers, treads, run, stringer length and cut marks.

Stairrise helps you work out a straight stair and mark the stringer before you pick up a saw. Enter the total rise from finished floor to finished floor, set your limits, and the app returns a complete layout.

What you get - Number of risers and treads, with every riser the same height - Exact riser height, tread depth and total run - Stair angle and stringer length along the pitch line, with the next common board length - A comfort check using the 2R + T rule of thumb - Throat depth left in the stringer board, so you can see if a board is wide enough - First-step drop for the thickness of your tread boards - Tread board depth including nosing - Optional total run limit, with a warning when the stair runs past it - Optional headroom check at a ceiling opening, plus the shortest opening that works - A cut layout table with the marks along the board edge and the height of each tread

The stringer is drawn to scale, with the notches, a figure for height reference and a headroom line at the opening.

Limits you control Max riser, minimum tread, nosing and tread thickness are all editable. The starting values are common US residential limits (max riser 7 3/4 in, min tread 10 in). They are general guidance only, so check your local code. Switch between inches with fractions down to 1/16 and millimeters at any time.

Projects and guide Save up to 30 projects, rename them, reopen them, or start from four built-in examples. Share a plain-text summary of any layout. A short guide explains rise, run, throat, nosing and how to set a framing square.

Everything stays on your phone. There is no sign-in, no ads and no network access, so your measurements are never sent anywhere.

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