Stringline vs RedX Construction Calculator

Construction calculator that works in feet, inches, and fractions — matched to 1/64". Download for free. No subscription. No ads. Works offline. 14 SPECIALTY CALCULATORS Stair Layout — rise, run, stringer, angle. IRC and OSHA code check built in. Concrete — cubic yards and bag counts for slabs, footings, columns. Rafter Length — common, hip/valley, jack. Plumb cut, seat cut, overhang. Equal Spacing — every position for studs, balusters, posts, joists. Compound Miter — blade tilt and miter angle for crown and trim. Studs / OC — count and positions for any wall at 16" or 24". Pitch / Slope — pitch, degrees, grade, and roof factor. Baluster Spacing — count, gap, and positions. IRC 4" sphere test built in. Board Feet — lumber volume from nominal dimensions. Drywall Estimator — sheets, waste factor, and opening deductions. Roofing Calculator — squares, bundles, and sheathing for any roof pitch. Right Triangle — check square on any corner. Two sides in, all angles out. Area & Volume — rectangles, circles, triangles, trapezoids. Conversions — feet-inches, decimal feet, metric. HOW IT WORKS Three calculators are yours to keep — Right Triangle, Area & Volume, and Conversions — with the full keypad, memory, and paper tape. No limits, no catch. The other 11 Pro calculators (stairs, concrete, rafters, and more) come with 5 uses so you can try them on a real job. One purchase unlocks everything permanently. YOUR TAPE READS FRACTIONS. SO DOES STRINGLINE. Enter 12' 3-1/2" exactly how you say it. No converting to decimals, no rounding surprises. Integer 64ths arithmetic — every answer matches your tape, not a floating-point guess. BUILT TO BE TRUSTED • Shows the math — step-by-step so you can verify every answer • IRC and OSHA validation with code section citations • Every formula verified against building code standards before release • Paper tape and full calculation history • PDF export with Show My Work steps • Works completely offline — no internet, no accounts No subscription. No ads. Built for tradespeople who can't afford a wrong number.

The 100% FREE construction calculator. REDX CALC is the feet-inch-fraction calculator for framers, carpenters, contractors and builders: rafter, stair, roof pitch and framing math with no ads, no subscriptions and no in-app purchases. Work the way you measure: add, cut and convert full feet-inch dimensions with fractions, and switch between imperial and metric in one tap. FEET & INCHES MATH • Add, subtract, multiply and divide feet-inch measurements with fractions • Adjustable fraction precision • Instant conversion between yards, feet, inches, meters, cm and mm • Percent, square, square root and reciprocal functions • Memory keys and automatic calculation history RIGHT TRIANGLES & ROOFS • Pitch, Rise, Run and Diagonal keys: enter what you know, tap to solve the rest • Hip/Valley and Jack rafter solvers • Miter angles for trim and framing STAIRS, ARCS & CIRCLES • Stair layouts: risers, treads, stringers and the stairwell opening • Arc solver for arched openings • Circle facts, columns and cone volumes DIMENSIONS • Length, Width and Height registers for areas and volumes • Unit-aware math keeps your results in the units you build with KNOW-HOW BUILT IN • Step-by-step guides for the basics, roofs, stairs, circles, conversions and more • Light and dark mode 100% FREE. FOREVER. No ads. No in-app purchases. No subscriptions. Every feature included. Part of the RedX Apps family: RedX Decks, RedX Roof, RedX Walls and RedX Stairs. Terms of Use https://www.redxapps.com/terms-of-service