Print the plan. Cut to the line.
Calculate once. Build right.
Stair layouts, rafter cut lists, and feet-inch-fraction math, exported to shop-ready PDFs you can print from the truck. Works offline. Built for builders.
Open App Store →
Complete stair layouts in seconds.
Enter total rise. CutOnce returns a code-compliant stair: unit rise, unit run, stringer length, and every dimension the crew needs to cut.
- Number of risers and treads
- Individual rise and run dimensions
- Stringer length and layout
- Baluster count and spacing for railings
Free to start. One-time purchase. No subscription.
Other construction calculators charge you every month for tools you've already learned to rely on. CutOnce is different. Download free, try every calculator for 7 days, keep the feet-inch-fraction calculator free forever. Unlock everything with a single one-time purchase. No monthly fees. No license checks. Just open the app and get to work.
- Free to download and try
- 7-day free trial of every advanced calculator
- One-time purchase for Full Access
- Works offline. No signal needed.
Every rafter cut. Every angle. No trig.
Pitch and span in. Common rafter length, ridge height, birdsmouth, and tail cuts out, all displayed in feet-inch-fractions the way your tape reads.
- Common rafter length from span or run
- Ridge height, HAP, and overhang
- Birdsmouth and tail cut dimensions
- Slope calculations in feet-inch-fractions
Hips, valleys, and jacks on the same sheet.
Backing angles, cheek cuts, king-common spacing, and jack rafter layout, printed right below the common rafter schedule.
- Hip and valley lengths with backing angles
- Cheek cuts for every connection
- King common and jack rafter spacing
Print the plan. Cut to the line.
Every stair and rafter calculation exports to a shop-ready PDF. Open it from the truck, walk it to the saw, cut. No signal, no cell service, no account required.
- 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
- Works entirely offline. Nothing uploads anywhere.
Open App Store →Enter it the way the tape reads.
Add, subtract, multiply, and divide in fractions the way carpenters actually measure. Free forever on every device. Precision from 1/2" down to 1/64".
- Natural entry: 3' 5-3/16" + 2' 10-1/2"
- All four operations, all in fractions
- Precision: 1/2" through 1/64"
- Free forever, no trial required
Every other calc a builder runs.
One app replaces the scrap-paper math, the formula Googling, and the "I think that's right" guessing. All included with Full Access.
Right Angle
Solve any right triangle from two known sides. Square walls, check layouts, cut braces.
Concrete Bags
Slab or post-hole volume converted to 40 / 50 / 60 / 80 lb bag counts, waste factor included.
Drywall
Sheet counts from 4×8 through 4×14, openings deducted, waste built in.
Deck
Board count, fasteners, posts, and code-compliant balusters for the whole deck.
Paint
Room dimensions to gallons, with coats, coverage, doors, and windows deducted.
Area & Volume
Rectangles, triangles, circles, and irregular shapes — square footage and cubic yards.
Unit Conversion
Imperial ↔ metric. Feet-inch-fractions ↔ decimal. Board feet ↔ linear feet.
Built for iPad. Made for a gloved thumb.
CutOnce is a native iPad app — landscape by default, inputs and results side by side, every inch of the screen put to work. On iPhone, the same precision, scaled for one-hand entry on the job.
Stop calculating. Start building.
Free to download. One-time purchase for Full Access. No subscription.
Open App Store →