CutOnce - Builder's Calculator

CutOnce is the construction calculator built for the jobsite: stair calculator, rafter calculator, roofing materials, concrete blocks and brick, crown moulding angles, concrete footings, board feet, and feet-inch-fraction math, with optional material cost on every estimate. Offline PDF plans, no subscription.

STAIR CALCULATOR
• Enter total rise and get a complete stair layout
• Live, zoomable diagrams: elevation, stringer, detail, and balusters
• Unit rise, unit run, number of treads and risers
• Stringer dimensions and layout, deck stairs included
• Export a detailed PDF with cut dimensions for the shop

RAFTER CALCULATOR
• Common rafters from span or run
• Ridge height, birdsmouth, and tail cuts
• HAP, overhang, and slope calculations
• PDF export with all the cut angles you need

HIP & VALLEY RAFTERS
• Hip and valley rafter lengths and angles
• Backing angles and cheek cuts
• King common and jack rafter spacing
• Full PDF export for the crew

OFFLINE PDF PLANS
• Shop-ready stair plans with every cut dimension
• Rafter plans with lengths, angles, and layout marks
• Print from the truck or share straight to the crew
• No signal, no cell service, no account required

FEET-INCH-FRACTION MATH
• Enter measurements naturally: 3' 5-3/16" + 2' 10-1/2"
• Add, subtract, multiply, and divide all in fractions
• Choose your precision: 1/2" through 1/64"
• Results displayed in feet-inches-fractions or inches-fractions

RIGHT ANGLE CALCULATOR
• Solve any right triangle from two known sides
• Enter in feet-inches-fractions, get results the same way
• Find the diagonal, rise, or run instantly
• Perfect for squaring walls, checking layouts, and cutting braces

ROOFING MATERIALS
• Shingle bundles and squares from roof area or measured surface
• Sheathing sheets, underlayment rolls, and ridge cap coverage
• Drip edge as lapped sticks with your own lap allowance
• Live roof diagram in Area mode and a shop-ready PDF takeoff

CONCRETE BLOCKS & BRICK (MASONRY)
• Block and brick counts with a fractional course layout
• Mortar yield by product and a CMU width selector (4"–12")
• Optional grout, rebar, bond-beam steel, and wall weight
• Tape and PDF with rebar spacing and openings accounted for

CROWN MOULDING / COMPOUND MITER
• Saw miter and bevel angles for crown on a compound-miter saw
• Nested (in-position) cutting mode for tight spots
• Pop-out angle diagram and a PDF you can take to the saw

CONCRETE FOOTINGS
• Pad and strip footing volume with bag or ready-mix takeoff
• Reinforcement assumptions surfaced (cover inset and lap)

COST ESTIMATING
• A Total Cost calculator to price out a whole job
• Optional price rows on Concrete Bags, Paint, Drywall, Deck, Board Feet, Masonry, Rake Wall, and Roofing
• Material cost prints right on the tape and the PDF

BUILT FOR THE JOBSITE
• Every calculator one tap away in the CutOnce Toolbox
• Free 7-day trial of every advanced calculator. Basic calculator always free.
• One-time purchase to unlock. No subscriptions. No ads.
• Free updates included
• Works on Android phones and tablets
• English and Spanish language included

Construction calculator with stair calculator, rafter calculator, roofing materials, masonry, crown moulding, footings, board feet, fraction math, cost estimating, and offline PDF plans. Built for contractors, framers, and finish carpenters.