CutOnce - Builder's Calculator

CutOnce - Builder's Calculator

Stairs, Rafters & Fractions

5 ratings
1 review
Free
In-App Purchases

Price history


Details

  • Released
  • Updated
  • April 8, 2026
  • September 20, 2026

Features

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About

This app provides essential jobsite calculations for contractors and builders, including stair and rafter plans, feet-inch-fraction math, and right triangle solutions. Generate detailed PDF plans offline and export them for shop use or sharing with your crew.

✓Stair and rafter PDF plan generation
✓Offline jobsite calculations
✓Feet-inch-fraction math
✓Right angle triangle solver
✓Board feet and concrete estimates
✓Live, zoomable diagrams
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What's New in CutOnce

1.14.0

September 20, 2026

• New stair baluster layouts. Choose Limit Opening, Fixed End Space, On Center, or Best Fit, pick where your marks are measured from, and CutOnce gives you the running mark for every baluster on the card, on the tape, and in the stair PDF. • New Spacing calculator. Lay out pickets, shelf pins, holes, or anything else evenly along a run, and read cumulative tape marks from the leading edge, center, or trailing edge, with true horizontal clear space on sloped runs. Deck railings can now share one common on center across sections. • Safer stairwell openings and a fuller code check. The minimum stairwell opening now allows for the full tread run and the upper finished floor, and the stair report now checks guard openings, nosing, the 6 inch triangle, and headroom. • New Box and Frame Miter calculator. Building a box, planter, or sloped frame with any number of sides? Enter the sides and the tilt and CutOnce works out the saw table miter and blade tilt for every cut, and warns you when a tilt is past what your saw can do. • Clearer, more accurate hip and valley PDFs. We tightened the jack schedule, plate and datum marks, note rounding, and rafter length wording, and rebuilt the optimized cut map into a clean Qty, Size, Length, and Pieces table. • Birdsmouth warnings on your cut plans. Rafter and hip and valley cut plans now print a graded warning when a birdsmouth cut runs too deep for the rafter, so you catch it before the cut. • Better wall stud lumber lists. The wall stud PDF now calls out the pressure treated bottom plate as its own item instead of pairing it with untreated stock, so the purchase list is one you can actually buy and build. • More in Spanish. Masonry mortar product names and more PDF labels and notes are now available in Spanish. • Smoother purchases and setup. We made restoring a purchase more reliable and streamlined the trial and first run experience.

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Subscriptions & In-App Purchases

$19.99

CutOnce Full Access

Unlock all calculators permanently.

User reviews

Made me feel like a pro

I built a deck in my backyard and CutOnce figured out how much lumber I needed, calculated my stair rise and run, and even told me how many concrete bags for the footings. I didn’t search for formulas or hope I got the math right. Everything just worked in the units I was buying at the store.

FAQ

Does CutOnce have ads?

No, CutOnce is ad-free. The app explicitly states it contains no advertisements, allowing for an uninterrupted user experience.

What is the pricing for CutOnce?

CutOnce offers a free basic calculator and a free 7-day trial for advanced features. A one-time purchase unlocks all advanced calculators permanently, with no subscriptions required.

What devices does CutOnce support?

CutOnce is available for both iPhone and iPad, ensuring compatibility across Apple's mobile device ecosystem.

How often is CutOnce updated?

The latest version, 1.7.0, was released on June 18, 2026, indicating regular updates. The app also guarantees free updates are included with the purchase.

Can I use CutOnce without an internet connection?

Yes, CutOnce is designed for offline use. All calculations and PDF plan generation can be performed without a signal or cell service.

What languages does CutOnce support?

CutOnce is available in both English and Spanish, catering to a broader range of users.

What is the age rating for CutOnce?

CutOnce has an age rating of 4+, making it suitable for a wide audience, including younger users involved in educational or hobbyist building projects.

How accurate are the calculations in CutOnce?

The app is built for contractors and builders who need accurate answers in the units they actually use, emphasizing precision in its feet-inch-fraction math and various jobsite calculations.