RafterMate: Construction Calc
Carpenter Calculator. Buy Once
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Buy once — no subscription. The feet-inch-fraction calculator built for carpenters: rafters, stairs, decks, concrete & cut lists with live diagrams. All offline.
RafterMate is the construction calculator you buy once — no subscription, no account, no ads.
Built for carpenters and framers, it does the feet-inch-fraction math you do all day, then adds the trade tools you actually reach for — each on its own visual screen with a live blueprint diagram, accurate to 1/16".
THE CALCULATOR
- Feet-inch-fraction, decimal feet, yards and metric - add, subtract, multiply, divide
- Paperless tape that remembers every step
- Area, volume, square feet and cubic yards
THE PRO TOOLS (one-time unlock)
- Rafter - run + pitch to rafter length, plumb/seat/birdsmouth cuts, ridge and overhang
- Stair - total rise to risers, treads, stringer length and the bottom-riser drop, with live IRC code warnings
- On-Center - wall length + 16"/19.2"/24" spacing to stud/joist counts, mark positions and wall-framing material
- Roofing - roof area to squares, shingle bundles and sheathing
- Area & Volume - slabs, footings and piers to square feet and cubic yards of concrete
- Board Feet - thickness x width x length to board feet and cost
- Deck - joists, beam, posts, footings and decking, with IRC joist-span checks
- Concrete - slab, footing or round column to cubic yards and premix bags
- Cut List - your pieces + stock lengths to a waste-minimizing, kerf-aware cut plan
- Miter - crown and corner miter + bevel angles
WHY RAFTERMATE
- Buy once. No subscription. Ever.
- Works fully offline - no account, no sign-in
- Universal - one purchase covers iPhone and iPad
- Validated against pro reference math to 1/16"
Pay once, open to the calculator, get to work.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Two new pro tools:
- Deck - joists, beam, posts, footings and decking, with IRC joist-span checks (plus a one-tap jump to concrete bags for the footings)
- Concrete - slab, footing or round column to cubic yards and premix bags
Also in this update:
- Stair: riser-count override to match an existing stair
- Board Feet: piece quantity and exact $/BF pricing
- Cut List: save and recall jobs
- Faster typed input, refreshed screenshots, bug fixes and accuracy improvements.
The developer, Cortex AI 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:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- CORTEX AI LLC
- Size
- 1.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Tools Unlock $9.99
- Copyright
- © 2026 Shi Qiu