Plumb Construction Calculator

Best Practice Chicago

In-app purchases

About this app

A feet-inch-fraction construction calculator with stair, rafter, roof, and concrete solvers — plus an AR tape measure, spirit level, and stud finder, in one app. For carpenters, framers, concrete finishers, masons, drywallers, and remodelers.

PLUMB PRO — THE JOBSITE TOOLBELT IN YOUR POCKET.

One app for the numbers, the measuring, and the paperwork — built to work with gloves on and zero bars of signal.

REPLACES A HANDHELD CONSTRUCTION CALCULATOR — AND DOES MORE
If you've used a dedicated feet-inch-fraction construction calculator on site, Plumb Pro does that math and then some. Type "6 ft 9 1/2 in + 2 ft 3/4" and it just works — feet, inches, and fractions, added, subtracted, multiplied, and divided with no rounding drift. A real fraction key, voice entry, one-tap unit conversion, and a full undo tape. No separate device to charge, lose, or leave in the truck — it's the calculator that's already in your pocket.

TEN TRADE CALCULATORS, EACH WITH A TO-SCALE DIAGRAM
• Stairs — risers, riser height, tread, total run, stringer, stairwell opening
• Roof & Rafters — pitch, plumb cut, cut length, tail, rise, board stock
• Concrete — cubic yards, cubic feet, 60/80 lb bags, weight
• Wall Framing — stud count, plate lumber
• Drywall — net area, 4x8 and 4x12 sheet counts
• Masonry — CMU blocks, bricks, mortar bags
• Circle, Polygons, Square-Up, and 3D Shapes — area, perimeter, volume, miter and diagonal

MEASURE AND INSPECT
• AR tape measure — point the camera, tap two points, read the distance
• Unit converter — lengths, areas, slopes, and survey measures
• Spirit level — linear, bullseye, and a locking torpedo vial with haptics
• Stud finder — sweep the wall for studs and metal
• Sound meter — a phone-mic estimate of jobsite noise
• Inspector — camera and flashlight for tight, dark spaces
• Topography — map floor dips, crowns, and flatness

SAVE THE PROOF, SHARE A CLEAN RECORD
Save any measurement, angle, or result — auto-named with type, date, time, and an optional jobsite location. Attach photos, mark them up, then export a branded PDF or PNG ledger, or back the whole set up to a .plumb file. Turn on Custom Branding to stamp your own business name and logo on every export.

WORKS WITH ZERO BARS
Your measurements, photos, and notes live on the device. No account, no login, no cloud — measure in a basement, a bare shell, or the middle of nowhere. (Purchases are processed securely through the App Store and RevenueCat.)

ENGLISH AND SPANISH
The whole app, including your exports, in English or Spanish.

TRY IT FREE
Start with a 14-day free trial of everything. After that, a single one-time purchase unlocks Plumb Pro for life — no subscription, ever.

A note on accuracy: measurements and calculations are fast estimates for planning and reference. For cuts, code, or anything safety-critical, verify with professional equipment and qualified judgment.

What’s new

Bug fixes and performance improvements