The stair calculator.
Enter the total rise, the tread depth and a target riser height. See the number of steps, an exact riser, the run, the stringer length and checks against the usual code limits, drawn to scale. Free, with no signup.
- Riser and run
- Code checks
- Free, no signup
Plan your stairs
The usual limits: riser at most 7 3/4 in, tread at least 10 in, about 6 ft 8 in of headroom and a landing for rises over about 12 ft. Your local building office has the final say.
- Riser height
- Treads
- Total run
- Stringer length
- Angle
- Framing
Saved. It will travel with your estimate request below.
Six rules that make stairs comfortable.
Equal risers
A difference of even a half inch between steps can trip people.
The 7 3/4 limit
The usual code maximum riser is about seven and three-quarter inches.
Ten inch treads
The usual code minimum tread depth is ten inches.
Headroom
About six feet eight inches of clear height is usually required.
Handrails
Handrails about 34 to 38 inches high are expected on stairs with several risers.
Landings
Rises over about twelve feet need a landing.
Learn more about stairs and rails.
Doors, Windows and StairsStair Building and StringersEvery step, the same height.
Doors, Windows and StairsRailings, Balusters and Newel PostsSafe to hold, nice to see.
Repairs and Handyman CarpentrySqueaky Floors and Stair RepairThe squeak ends here.
Decks, Porches and OutdoorDeck BuildingYour backyard, upgraded.
Remodeling and RenovationBasement FinishingDownstairs, upgraded.
Commercial, Custom and PlanningFree Carpentry EstimatesKnow the number first.Stair questions
Do I need a permit for my project?
Additions, load-bearing changes, most decks, porches and finished basements usually need permits, while trim, cabinets and interior finish work usually do not. Rules differ by city and county, and we help you find out what applies at your address.
Are your estimates free?
Yes. Estimates are free and come in writing with the scope, materials, finishes and price itemized. Fill in the form on any page, or call or text 615-431-3789, and we will schedule a visit or review your photos.
How long does a project take?
A trim package or a set of interior doors may take a few days, a custom built-in a few weeks including shop time, and a deck or addition one to several weeks. We give a schedule with the written estimate.
Want stairs built or fixed?
A carpenter will measure, check the code at your address and give you a written price.