Construction Expert A1 Pro
By Binary and BricksThe feet-inch construction calculator for US and Canadian pros — stairs, rafters, roof pitch and framing, with diagrams for every shape. One-time payment, no subscription.
Get the app
Opens Google Play or the App Store, depending on your device.
7trade calculators
57shapes with diagrams
50+unit converters
Pricing
One-time payment unlocks every trade calculator, converter and shape — no subscription.
What's inside
Roof rafters — pitch, rise, run, common, hip/valley & jack
Complete stair layout — risers, treads, stringer, inclination
Compound miter & trim calculations
Baluster spacing & fence layout
Stud spacing & floor joists
Board feet & lumber estimating
Drywall calculator
Electrical, plumbing, HVAC & landscaping calculators
57 shapes with interactive diagrams
50+ construction-specific unit converters
Feet, inches and fractions throughout
A look inside the app
Why professionals use it
One-time payment
Buy it once and own it. No subscription, no renewal, no losing access to your own calculator because a card expired.
Diagrams, not just numbers
Every shape and every roof or stair calculation comes with a dimensioned diagram, so you can check the geometry before you cut.
Seven trades in one tool
Framing, roofing, trim, foundation, electrical, plumbing and landscaping calculators in a single app.
Try it free first
The same calculations, free in your browser
No download needed. When you want them on site without a signal, the app takes them offline.
From the Construction Expert A1 Pro blog
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Learn the method, not just the answer
Our guides explain the calculations behind this app, formula by formula.