Coming Soon

Sign up to be notified when this app launches.

Framing & Carpentry Calculator

Calculate stairs, rafters, and framing estimates for any job site.

$9.99. Once. Forever. No subscription. No account. Works offline.

Coming Soon to the App Store

Framing & Carpentry Calculator is currently in development and will be available on the App Store soon. Enter your email to be notified the moment it launches.

[Notify Me When It Launches]

What’s Inside

Free Features

  • Feet-Inch-Fraction Calculator — Full arithmetic (+, −, ×, ÷) in feet-inch-fractions with a glove-friendly custom keypad. Convert between decimals and feet-inch-fractions instantly.
  • Board Feet Calculator — Instantly calculate board feet per piece and totals from nominal lumber sizes (2x4, 2x6, etc.) or custom dimensions.
  • Stud Count & Equal Spacing — Find exact stud counts and actual spacing for any wall length. Supports 12”, 16”, 19.2”, 24” on-center with end stud toggles.

Full Unlock ($9.99 one-time)

  • Stair Calculator — Input total rise and desired tread depth, get riser count, actual riser height, tread depth, stringer length, cut angles, and headroom. Live-updating dimensioned stringer drawing exports as PDF for permits.
  • Rafter Calculator — Common, hip, valley, jack, and irregular hip rafters. Outputs rafter length, ridge cut angles, birdsmouth dimensions, hip pitch, backing angles, cheek cuts, and full roof cross-section diagrams.
  • Roof Area & Shingle Estimator — Building dimensions to roof area, squares of shingles, 4x8 sheathing sheets, ridge/hip/valley/rake lengths.
  • Baluster Layout — Railing length to exact baluster spacing that meets code (4” max). Output layout marks from each end.
  • Concrete & Masonry Estimator — Slab, footing, column, step, and CMU wall estimations with mortar bag counts and rebar grids.
  • Drywall Estimator — Room dimensions with door/window openings to sheet count (walls + ceiling) with waste factor.
  • Framing Lumber Estimator — Wall dimensions to stud count, plate footage, header stock, and corner bracing.
  • Compound Miter Calculator — Spring angle and corner angle to miter saw angle and bevel angle with 38°/45°/52° crown presets.
  • Roof Pitch Converter — Convert X:12 pitch ↔ degrees ↔ percent grade. Solve rise/run problems instantly.
  • Area, Volume & Unit Converter — Standard shapes and construction-unit conversions.
  • Accelerometer Roof Pitch Meter — Point phone at any roof surface and read pitch live in X:12 format AND degrees. Tap Lock to auto-fill the rafter calculator. No physical pitch gauge needed.
  • Voice Input — Speak measurements while holding lumber. Hands-free entry for “nine feet two and a half,” “eight twelve pitch,” “two by twelve,” “sixteen on center.”
  • Save & History — Save calculation snapshots with project labels. PDF export for stair stringers and rafter diagrams (white background for blueprint aesthetic, regardless of light/dark mode).

Why We Built This

Construction Master Pro, the dominant framing app with 37,000 reviews, just moved to $20/month subscription pricing. Professional carpenters with 20+ years experience are furious. One review: “When I recommended this to new hires they told me it cost $20/month. The 16-year equivalent cost is $3,840. I cannot in good conscience recommend this to anyone starting out in the trades.”

The math is brutal: $20/month = $240/year = $3,840 over 16 years. We’re charging $9.99. Once. That’s it.

FieldLab is built on what builders actually want: modern SwiftUI native design, system dark/light mode, offline-first architecture with zero account required, and features that only modern phones can deliver (accelerometer pitch meter, voice input with gloves on).

Built for the Jobsite

  • Glove-Friendly — 48pt minimum tap targets. Custom fraction keypad designed for work gloves. No tiny buttons.
  • Light Mode Optimized — Framers work outdoors in bright sunlight, not dark panels. Light mode is primary with full dark mode support. Stair and rafter drawings render on white background (blueprint paper aesthetic) in light mode, dark background in dark mode.
  • Works Offline — Zero internet required. No account. No login. Your data never leaves your phone. Calculations happen instantly on your device.
  • Voice Input — Hands full? Hands-free measurement entry. Speak dimensions while holding stringers, lumber, or running tape measures.

The Competition Moved to Subscriptions. We Won’t.

Construction Master Pro now costs $20/month. Over 16 years, that’s $3,840.

Framing & Carpentry Calculator costs $9.99. Once. That’s it.

We will never charge a subscription. Read why →

Try Our Free Calculators While You Wait