RafterMate: Construction Calc

Buy once — no subscription. The feet-inch-fraction calculator built for carpenters: rafters, stairs, stud layout, board feet & 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 and mark positions
• Board Feet - thickness x width x length to board feet and cost
• Cut List - your pieces + stock length to a waste-minimizing, kerf-aware cut plan

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.