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Free UC field tool

Stair & Stringer
Calculator

Turn a finished rise into a practical cut layout with equal risers, exact measurements, stock length, and a drawing you can take to the saw.

01

Enter dimensions

Top landing configuration

Planning aid only. Measure the actual site and confirm all applicable building-code requirements before ordering material or cutting a stringer.

02

Your stair layout

The estimated 2×12 throat is below the common 5 1/2-inch prescriptive reference. Verify against the requirements for your location.
LANDING = FINAL TREADRUN 133 1/4″RISE 108″
Exact riser height7 11/16″14 equal risers
Bottom stringer - first rise cut6 3/16″7 11/16″ riser minus 1 1/2″ tread thickness
Top configurationLanding is final treadUpper landing completes the flight
Number of treads13
Total horizontal run133 1/4″
Minimum tread-board depth11 1/4″Run plus nosing; add any riser-board allowance separately
Stair angle37.0°
Estimated 2×12 throat5 1/16″Based on an actual 11 1/4-inch board depth
Approx. diagonal span171 1/2″
Recommended 2×1216′Includes about 6% allowance
Measure twiceLay out cleanCut with confidence

The jobsite short list

Tools that make the cut easier.

Field-tested recommendations for laying out and cutting stair stringers will live here.

Product recommendations coming laterSpeed square · Circular saw · Jigsaw · Structural fastenersAffiliate links will be clearly identified when connected.

Printable field notes

Take the layout to the shop.

The print button already creates a clean layout sheet. Email delivery and occasional UC build notes can be connected later without changing the quote form.

Planning and code notice

This calculator is a layout aid, not an engineered design or code approval. The mounting diagrams are conceptual and do not specify hangers, fasteners, framing reinforcement, bearing, stringer quantity, material grade, headroom, guards, handrails, landing size, or local requirements. Confirm the finished opening, connection design, lumber and governing code before construction.