StringerPro vs Stair Stringer Calculator Pro

StringerPro turns total rise and total run into a code-checked, ready-to-cut stair stringer layout. Built for finish carpenters, framers and deck builders who want one tool that does the stringer job properly, including the bottom step. KEY FEATURES - Fraction-native input. Feet, whole inches and a sixteenths picker that works the way a construction calculator does. Common stops (0, 1/4, 1/2, 3/4) are one tap. - IRC R311.7 code validation. Live green / amber / red badges for riser height (max 7-3/4"), tread depth (min 10"), riser variance, 2x12 throat (min 3-1/2"), comfort (rise plus tread), and pitch angle. - The bottom step handled correctly. The bottom riser is automatically shortened by the tread thickness so walking rises stay uniform once treads are installed, a common source of uneven steps. - Side-view diagram with every dimension labelled. A clean 2D elevation that prints legibly. - Framing-square cut sheet. Step-by-step heel positions along the top edge of the 2x12, with rise leg and run leg dimensions for every notch, plus the seat and plumb end cuts. - 1:1 print template. Tile the side view across letter pages at full scale, tape them together and trace straight onto the 2x12. Crop marks on every corner. - Material estimator. Enter stringer count, stair width and lumber prices; get linear footage and total job cost, fasteners included. - Saved jobs with job name, address and notes. - Deck stair mode, which marks the job as a deck stair on the summary sheet. Set deck-board tread stock and nosing on the inputs screen. - Imperial and metric, in light and dark appearance. - Works entirely offline. No account and no sign-in. PREMIUM UNLOCK (one-time purchase, not a subscription) - Unlimited saved jobs - All three PDF exports: summary, cut sheet and 1:1 print template - Material estimator - Removes ads - Priority support DISCLAIMER Verify all measurements before cutting. Output is for estimation only. Local building codes vary. Contact: support@clearstackapps.com Privacy: https://clearstackapps.com/privacy

Stair Stringer Calculator lays out a straight flight of stairs from three measurements and tells you how to cut the stringers — in carpenter's fractions, not decimals. Enter the total rise, the tallest riser you'll accept and your tread depth. You get the riser count and exact riser height, the tread count, total run, stringer length and stair angle, plus a to-scale drawing of the cut stringer. CUT IT RIGHT • Riser height is rounded so it never exceeds your maximum • The first riser cut is dropped by your tread thickness, so every finished step is equal • Framing square settings and the step-off distance along the board edge • Notch depth and the solid wood left under the notches (throat) for a 2x10, a 2x12 or any board depth • How many stringers to cut for your stair width, and their spacing • Type measurements the way you read a tape: 108 1/2, 9' 0-1/2", 7 3/4 CHECK IT BEFORE YOU CUT Every layout is checked, and the result shows what passed, not only what failed: • IRC R311.7: maximum riser 7-3/4", minimum tread 10", maximum rise of one flight 151", minimum width 36", nosing and handrail requirements • AWC DCA 6 deck-stair stringer limits: at least 5" of throat, a 6'-0" maximum span for cut stringers, stringers no more than 18" on center • The stride rule 2R + T for a comfortable stair (24–25 in; 590–650 mm per DIN 18065 when you work in millimeters) FULL CUT LIST AND PDF • Height, run and board-edge mark for every step • A PDF layout sheet with the drawing, cut list and code check for your crew or inspector • Unlimited history: reopen any saved layout with its drawing and checks INCHES OR MILLIMETERS Switch units any time. Inch results read like a tape measure, to the nearest 1/16". WORKS THE WAY YOU DO • All calculations run on your device — no account or sign-in required. • Calculations and saved history work offline on the job site • No ads. Usage reporting can be turned off in Settings • The app sends verified purchase records and feedback you choose to submit • English and Spanish interface SIMPLE PRICING The calculation, drawing and code check are free, and the free version keeps your 10 most recent layouts. One in-app purchase unlocks the full cut list, PDF export and unlimited history. No subscription. The formula sources are listed in the app: IRC 2021 Section R311.7, AWC DCA 6-15 Figures 28–29, and the stride rule. This app is a layout aid; always verify against the building code in force at your job site.