CutOnce - Builder's Calculator

The construction calculator that generates stair and rafter PDF plans offline, on your phone. No signal, no account, no subscription. Feet and inches fraction math, code-checked stairs, rake wall stud schedules, roofing, masonry, crown angles, footings, deck, drywall, paint, and board feet, with optional material cost on every estimate. STAIR CALCULATOR • Enter total rise and get a complete stair layout • Code check against IRC R311.7 (riser, tread, throat, total rise, headroom), on screen and on the plan, with every limit editable in Settings • Live, zoomable diagrams: elevation, stringer, detail, and balusters • Flush (deck) mount stringers, plus a landing split when one flight is too tall • Export a detailed PDF with cut dimensions for the shop RAFTER CALCULATOR • Common rafters from span or run • Ridge height, birdsmouth, tail cuts, HAP, overhang, and slope • PDF export with all the cut angles you need HIP & VALLEY RAFTERS • Hip and valley lengths, backing angles, and cheek cuts • King common and jack rafter spacing, with full PDF export RAKE WALL / GABLE FRAMING • Every stud length from pitch, run, base height, and on-center spacing • Top plate bevel and pitch-off-square angles called out • Dimensioned elevation PDF with the full stud schedule for the saw ARC & CURVES • Radius, diameter, arc length, and included angle from a chord and rise • Or work back from diameter and angle, with a live curve to zoom FEET-INCH-FRACTION MATH • Enter measurements naturally: 3' 5-3/16" + 2' 10-1/2" • Add, subtract, multiply, and divide all in fractions • Choose your precision: 1/2" through 1/64" • Five memory registers, M1 through M5, for several running totals at once RIGHT ANGLE & TRIG • Solve any right triangle from two known sides in feet-inches-fractions • Sin, cos, and tan with inverses, in degrees or degrees-minutes-seconds • Perfect for squaring walls, checking layouts, and cutting braces ROOFING MATERIALS • Shingle bundles and squares from roof area or measured surface • Sheathing sheets, underlayment rolls, ridge cap, and lapped drip edge • Live roof diagram and a shop-ready PDF takeoff CONCRETE BLOCKS & BRICK (MASONRY) • Block and brick counts with a fractional course layout • Mortar yield by product and a CMU width selector (4"–12") • Optional grout, rebar, bond-beam steel, and wall weight CROWN MOULDING / COMPOUND MITER • Saw miter and bevel angles for crown on a compound-miter saw • Nested (in-position) cutting mode, angle diagram, and a PDF for the saw MATERIAL TAKEOFFS • Deck: boards, screws, railing posts, and balusters at code gap • Drywall: wall and ceiling sheets, 4x8 to 4x14, openings and waste • Paint: paintable area and gallons by coat, at your can's spread rate • Board feet: run a whole cut list and total it on the tape • Concrete: bags or yards with adjustable waste, plus pad and strip footings • Area, volume, and unit conversion in imperial or metric COST ESTIMATING • Total Cost solves any direction: the total, what a budget buys, or the price to hit • Optional price rows on nearly every material calculator • Material cost prints right on the tape and the PDF BUILT FOR THE JOBSITE • Free 7-day trial of every advanced calculator. Basic calculator always free. • One-time purchase to unlock. No subscriptions, no ads, free updates. • Works on iPhone and iPad, in English and Spanish Framing walls, cutting stringers, laying out rafters, ordering roofing and block: CutOnce gives you accurate answers in the units you actually use.