Construction Calculator vs BoBo Calculate

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

Bobo Geometry Workshop makes triangle calculations clear, visual, and practical. Enter any three known sides or angles to solve a triangle in seconds. Whether you are studying geometry, checking your work, building stairs, or planning a cut, every result is easy to understand and verify. 【Complete Triangle Solver】 Supports SSS, SAS, SSA, ASA, AAS, and AAA combinations. When an SSA problem has two valid solutions, both are shown. Results include: • All sides and angles • Triangle classification • Area, perimeter, and semiperimeter • Three altitudes • Inradius and circumradius • Degree and radian modes 【Visual Diagrams and Clear Steps】 Triangles are drawn to the calculated side proportions. You can also display altitudes, medians, angle bisectors, incircles, circumcircles, and triangle centers. Detailed formulas and substituted values show how each answer was calculated, making results easier to learn from and verify. 【Practical Tools】 Built-in calculators help with common measurement tasks: • Stair dimensions • Wood lengths and miter angles • Pipe offsets • Slopes and elevation changes • Brace lengths 【Save and Share】 • Keep recent calculations on your device • Reload previous values and continue calculating • Export results as images • Copy and share calculation results • Customize tool order and text size • Switch between Simplified Chinese and English The triangle calculator is free to use. An optional subscription unlocks the stairs, wood, pipe, slope, and brace calculators. Calculation inputs, results, and history are processed and stored locally on your device and are not uploaded to a developer server. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/