Construction Calculator vs LFA Stairs Pro

Build faster, measure smarter. Pro² is a complete construction calculator for decking, roofing, concrete, stairs, framing and precise on-site measurements. It’s made for builders, carpenters, contractors and serious DIY who need accurate answers in seconds. DECKING & FLOORING • Area, board runs, spacing and waste allowance • Material takeoff for boards and joists ROOFING (METAL & TILE) • Coverage and sheet/tile counts • Overhangs, pitch, angle and rafter length helpers STAIRS & STRINGERS • Rise/run, slope %, angle (°) and stringer length • Clear breakdowns and step-by-step visuals BALUSTERS, RAILING & EVEN SPACING • Perfect marks from 0 to full length • Spacing tables for clean, consistent layouts CONCRETE, ASPHALT, GRAVEL & SOIL • Volume estimators for slabs, pads, footings and fills • Smart rounding for real-world quantities SLOPE, PITCH & ANGLES • Fast framing helpers for cuts and layout • Metric and imperial support in every tool UNIT CONVERTER • Length, area, volume, density and weight • Built for mixed-unit jobs (mm, ft, inches) QUICK CALCULATOR • Running history with one-tap copy/share MADE FOR THE JOBSITE • Fraction support and practical defaults • Works fully offline—no signal required • Clean visuals that stay readable outdoors WHY PROS USE PRO² • One app instead of juggling multiple separate tools • Accurate results, simple inputs and clear diagrams • New tools and improvements arrive regularly based on user feedback Pro² is built for professional construction, carpentry, decking, roofing and framing work—yet intuitive enough for DIY home projects. Upgrade to unlock additional tools and advanced features when you’re ready to grow your toolkit. SUBSCRIPTION TERMS • Carpenter Pro is an optional auto-renewing subscription with Weekly and Annual plans. • A 3-day free trial is available on the Annual plan. • Payment is charged to your Apple ID and subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. • You can manage or cancel your subscription in your App Store account settings. • Lifetime is a one-time purchase and does not auto-renew. • The localized price is shown in-app before you confirm. Terms of Use (Apple EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://shapkin.dev/apps/carpenter/privacy.html

LFA Stairs is the professional carpentry and design tool for laying out staircases on the jobsite. Enter the total rise and width, and you immediately get the riser and tread layout, dimensioned CAD blueprints, an interactive 3D model, and a complete cut list with every piece measured. ELEVEN STAIR TYPES • Straight • L-shape left and right • Winder L-shape • 180° U-shape • Winder U-shape • Spiral / Helical • Floating Cantilever • Curved • Mono-Stringer • Open Riser WHAT YOU GET • Riser and tread layout with exact floor arrival height • 2D CAD plan: plan view, front and side elevations, fully dimensioned • 3D stair that you can rotate and zoom with your fingers • Detail card for each piece: cut length, cross section, bevel angles, bearing points, and fasteners • Complete cut list ready for the lumberyard • Stringers, risers, treads, landings, railing, and skirtboards RAILINGS Wood balusters, wrought iron, glass panels, stainless steel cable, horizontal slats, and industrial pipe. Baluster spacing is computed automatically and checked against the clear-opening limit. BUILDING CODES Calculations follow the International Residential Code (IRC): riser height (R311.7.5.1), tread depth (R311.7.5.2), walkline in spirals (R311.7.10.1), 4-inch sphere rule for balusters (R312.1.3), landings (R311.7.6), and handrail height (R311.7.8.1). The app alerts you when any dimension falls outside IRC limits. EXPORT AND SHARE • PDF report with full technical specifications and jobsite plans • 3D and CAD exports in OBJ, DAE, and DXF IN YOUR LANGUAGE AND UNITS English and Spanish. Inches and feet, or metric. WORKS OFFLINE Calculation, design, and 3D viewer do not require an internet connection. Your projects and dimensions are saved locally on your device. PREMIUM SUBSCRIPTION PDF and CAD exports are included in the optional subscription. All Results tabs can be viewed without a subscription. • Monthly and annual plans with prices shown in the app for your region. • A 7-day free trial may be available to eligible new subscribers. Subscription automatically renews through your Apple ID unless canceled in iOS Settings at least 24 hours before the end of the current period. Made by LFA Interiors and Construction LLC. Privacy Policy: https://lfa-legal.surge.sh/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/