CutOnce - Builder's Calculator
Stairs, Rafters & Fractions
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Free 7-day trial, then one unlock for life. No subscription. Code-checked stair plans, rake wall stud schedules, rafters, arcs, trig, and fraction math. Offline PDFs.
The construction calculator that generates stair and rafter PDF plans offline, on your phone. No signal, no account, no subscription. Feet and inches fraction math, code-checked stairs, rake wall stud schedules, roofing, masonry, crown angles, footings, deck, drywall, paint, and board feet, with optional material cost on every estimate.
STAIR CALCULATOR
• Enter total rise and get a complete stair layout
• Code check against IRC R311.7 (riser, tread, throat, total rise, headroom), on screen and on the plan, with every limit editable in Settings
• Live, zoomable diagrams: elevation, stringer, detail, and balusters
• Flush (deck) mount stringers, plus a landing split when one flight is too tall
• Export a detailed PDF with cut dimensions for the shop
RAFTER CALCULATOR
• Common rafters from span or run
• Ridge height, birdsmouth, tail cuts, HAP, overhang, and slope
• PDF export with all the cut angles you need
HIP & VALLEY RAFTERS
• Hip and valley lengths, backing angles, and cheek cuts
• King common and jack rafter spacing, with full PDF export
RAKE WALL / GABLE FRAMING
• Every stud length from pitch, run, base height, and on-center spacing
• Top plate bevel and pitch-off-square angles called out
• Dimensioned elevation PDF with the full stud schedule for the saw
ARC & CURVES
• Radius, diameter, arc length, and included angle from a chord and rise
• Or work back from diameter and angle, with a live curve to zoom
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"
• Five memory registers, M1 through M5, for several running totals at once
RIGHT ANGLE & TRIG
• Solve any right triangle from two known sides in feet-inches-fractions
• Sin, cos, and tan with inverses, in degrees or degrees-minutes-seconds
• 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, ridge cap, and lapped drip edge
• Live roof diagram 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
CROWN MOULDING / COMPOUND MITER
• Saw miter and bevel angles for crown on a compound-miter saw
• Nested (in-position) cutting mode, angle diagram, and a PDF for the saw
MATERIAL TAKEOFFS
• Deck: boards, screws, railing posts, and balusters at code gap
• Drywall: wall and ceiling sheets, 4x8 to 4x14, openings and waste
• Paint: paintable area and gallons by coat, at your can's spread rate
• Board feet: run a whole cut list and total it on the tape
• Concrete: bags or yards with adjustable waste, plus pad and strip footings
• Area, volume, and unit conversion in imperial or metric
COST ESTIMATING
• Total Cost solves any direction: the total, what a budget buys, or the price to hit
• Optional price rows on nearly every material calculator
• Material cost prints right on the tape and the PDF
BUILT FOR THE JOBSITE
• Free 7-day trial of every advanced calculator. Basic calculator always free.
• One-time purchase to unlock. No subscriptions, no ads, free updates.
• Works on iPhone and iPad, in English and Spanish
Framing walls, cutting stringers, laying out rafters, ordering roofing and block: CutOnce gives you accurate answers in the units you actually use.
• New Fencing calculator. Lay out a fence of one or more segments with posts, rails, and gates where you need them, then fill the bays with pickets and a mark list or with prefab panels and a bay schedule that shows the cut panel width. It also counts concrete bags for the post holes, adds optional cost, draws a typical bay, and exports a one-page PDF. The gate width you enter is the clear opening between the gate posts.
• Stair balusters check the opening between treads. On Center and Fixed End Space now check the front space plus the back space, where one tread meets the next, against your maximum opening in the code check and the PDF. The stair PDF and notes now name the spaces Back space and Front space, and Front space sets the opening on the nosing side.
• Spacing and Deck railing values are rounded once. In imperial, On center, Open space, and every mark are rounded once from the exact layout to your fraction setting, so none of them can land one step high anymore. In metric, Limit opening and Best fit no longer add an extra member at an exact boundary.
• Clearer Rafter Length help. Help now says Rafter Length runs from the ridge center line to the building line, before the ridge deduction and without the overhang.
The developer, Verik Labs LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Verik Labs LLC
- Size
- 14.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Full Access: All Calculators $19.99
- Copyright
- © 2026 Verik Labs LLC

