StairSmith
Stair calculator for builders, DIYers, and dads with a saw.
Live diagram. Code compliance. Print-ready cut sheet. No subscription, no ads, yours forever.
Get StairSmith on the App Store
Launch sale
$6.99$9.99
One-time purchase · iPhone & iPad · no subscription
See it work
From total rise to ready-to-cut.
WHYThe fastest stair calculator that respects you.
- Type your total rise. StairSmith equalizes the risers, draws the diagram live, and tells you what to cut — instantly.
- Building-code compliance built in for IRC, IBC, NBC, Part K, and NCC. No code book required.
- Print-ready PDF cut sheet with elevation diagram, framing-square layout, and lumber list. AirDrop, email, or print.
- Works offline. No account, no cloud, no analytics, no ads. Your projects stay on your device.
WHAT YOU GETEverything you need to build a flight of stairs, right.
- Live elevation diagram — pinch, pan, tap any dimension to learn what it means.
- Cut Sheet hero — riser height, code going, riser count, stringer length. Take it to the saw.
- Lumber cheat sheet — number of stringers, treads, and risers, with stringer length rounded to the next standard 2×12.
- Framing-square layout — "set tongue at 7", blade at 10"" with a beautiful, printable diagram.
- Code compliance — pass/fail on riser, going, 2R+T, headroom; handrail and guard reminders for free.
