Construction Calculator vs Stair Stringer Calculator Pro

Construction Calculator Pro is the ultimate professional construction, carpentry, and civil engineering calculator—built specifically for general contractors, framers, finish carpenters, masonry builders, and estimators. Engineered to replace bulky handheld jobsite calculators, Construction Calculator Pro puts tactile, sunlight-readable precision right in your pocket. It works 100% offline with zero account requirements, zero cloud dependencies, and zero monthly subscriptions. ► FRACTIONAL DIMENSIONAL MATH • Add, subtract, multiply, and divide feet, inches, fractions (down to 1/64"), yards, meters, centimeters, and millimeters. • Instant unit conversions across imperial and metric dimensions with a single tap. • Visual 0–15 fraction picker for lightning-fast entry without decimal typing errors. • Continuous paperless history tape with labeled annotations. ► STAIR STRINGER & RAFTER LAYOUT (WITH CODE CHECKS) • Stair Layout: Calculate total rise, run, number of risers/treads, stringer throat cuts, and incline angle. • Built-in IRC / IBC code validation instantly flags non-compliant riser heights or tread depths. • Rafter Cuts: Calculate common rafters, hips, valleys, jacks, ridge deductions, and birdsmouth seat/plumb cuts with real-time 2D CAD diagrams. ► RUNNING TAPE & BALUSTER SPACING • Mark framing studs, joists, and baluster center-to-center layouts in a single continuous pass. • Built-in 4-inch sphere safety check ensures railings meet building code standards. ► CUT LIST & BOARD OPTIMIZER • First-Fit Decreasing (FFD) 1D bin packing optimizer minimizes scrap and lumber costs. • Automatically factors in saw blade kerf thickness so your physical cuts match your calculations. ► CIVIL & STRUCTURAL TAKEOFFS • Concrete Estimator: Slabs, footings, round columns, and curbs with custom waste factors. • Drywall & Sheathing: Sheet counts, joint compound, and screw estimates. • Brick & Block Masonry: Modular brick and CMU block counts with mortar volume. • Concrete Mix Proportions: Cement, sand, aggregate, and water weights for nominal mixes. • Rebar BBS (Bar Bending Schedule): Total length, weight, and cutting lists. • RCC Structural Elements: Beams, columns, and slabs. • Earthwork & Excavation: Trench, pit, and swimming pool volume estimations. ► INTERNATIONAL BUILDING CODES (195+ COUNTRIES) • Select your jurisdiction to automatically apply local stair rise/tread rules, baluster maximums, and safety guard regulations. ► PRIVACY & TRANSPARENCY • 100% Offline: Calculates entirely on your device. • Zero Data Collection: No tracking, no user accounts, nothing sent to external servers. • Fair Pricing: Free with non-intrusive banner ads that never block your keypad. Optional one-time $9.99 purchase removes all ads forever—no subscriptions. Support & Privacy Policy: https://chronos-labs.tech

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.