Stair Stringer
Risers, treads, total run, stringer length, and IRC reference warnings for code-aware stair layout.
Offline jobsite carpentry calculator
Carpentry Calculator Ready before you cut
Turn feet-inch-fraction measurements into clear results for stairs, rafters, lumber, layouts, and takeoffs. This carpentry calculator works offline on the jobsite — no account, no ads, no subscription.
Built for carpenters, framers, remodelers, builders, and serious DIY woodworkers.
Why carpenters trust this carpentry calculator on the jobsite
The carpentry calculator is designed for real framing work — not classroom examples. Every result shows feet-inch-fraction output the way your tape reads.
Calculate stair stringers before the first cut
Enter total rise and tread depth. The carpentry calculator returns riser count, actual riser height, total run, stringer length, and pitch angle — with IRC reference warnings when dimensions fall outside common limits.
A carpentry calculator that works with no signal
Core calculators in this carpentry calculator run fully offline. No cell service on the roof or in the basement? You still get stair, rafter, board feet, and layout results instantly — with no ads interrupting your work.
Every carpentry calculator tool in one app
Twelve focused calculators cover the jobsite math carpenters reach for every day. All core tools are free and offline in the carpentry calculator.
Rafter / Roof Pitch
Common rafter length, rise, pitch angle, plumb cut, seat cut, overhang, roof area, and sheathing estimates.
Board Feet
Nominal lumber volume, quantities, and cost — know how much lumber to order before you buy.
Stud / Joist Layout
On-center count, mark positions, openings, corner studs, and plate estimates for faster framing.
Sheet Goods
Drywall, OSB, and plywood sheet counts with waste factor, orientation, and order area.
Job Takeoff
Material quantities, waste percentages, units, and line-item cost for quick job estimates.
Concrete Volume
Cubic feet, cubic yards, and 60/80 lb bag counts for footings, slabs, and pads.
Square-up Diagonal
Quick 3-4-5 layout checks to square walls, decks, and foundations before you build.
Unit Converter
Feet-inch-fraction, decimal inch, decimal foot, and metric — switch the way your plans read.
Fraction Calculator
Add, subtract, multiply, and divide fractions with results reduced to the simplest form.
Feet-Inch Tape
Add and subtract jobsite dimensions like 12' 3-1/2" + 7-5/8" without reaching for paper.
Crown Miter
Flat crown molding miter and bevel settings for trim work that fits the first time.
How to use the carpentry calculator in 3 steps
The carpentry calculator is form-based and apprentice-friendly — pick a tool, enter measurements, and double-check before you cut.
01
Pick the right carpentry calculator for the job
Open the carpentry calculator and choose from twelve tools: stairs, rafters, board feet, stud layout, sheet goods, concrete, and more. Each calculator shows a diagram so you know exactly what each input means.
- Start with Stair Stringer or Rafter for framing jobs
- Use Feet-Inch Tape for quick dimension math
02
Enter measurements the way you measure
Type feet, inches, fractions, decimals, or metric. The carpentry calculator parses 5' 3-7/8" naturally and rounds to 1/16" — the way a real tape measure reads, not abstract decimals.
Results show both fraction and decimal forms so you can cross-check against your tape.
03
Save, organize, and share with your crew
Save calculations to history, group them by project, and export diagram PDFs with Pro. Every carpentry calculator result includes a formula reference and a disclaimer to verify before cutting.
Download the carpentry calculatorCarpentry calculator questions answered
Common questions about the carpentry calculator app, offline use, pricing, and how results should be used on the jobsite.
Does the carpentry calculator work offline?
Yes. All twelve core calculators in the carpentry calculator work fully offline. Network access is only requested when you choose to purchase Pro, restore a purchase, or open a link such as support or privacy policy.
Is the carpentry calculator a subscription?
No. The carpentry calculator has no subscription. All core calculators are free. Pro is a one-time purchase that unlocks workflow upgrades like unlimited saved records, diagram PDF exports, and custom IRC reference limits.
Who is the carpentry calculator built for?
The carpentry calculator is built for carpenters, framers, remodelers, builders, and serious DIY woodworkers who work in feet-inch-fraction measurements on North American jobsites.
What IRC warnings does the carpentry calculator show?
The stair stringer calculator references IRC 2021 R311.7 limits for riser height and tread depth. When your inputs fall outside common reference ranges, the carpentry calculator flags them so you can verify against local code before building.
How accurate are carpentry calculator results?
Results are rounded to 1/16" by default (configurable to 1/8" or 1/32"). Every result shows both fraction and decimal forms. All carpentry calculator outputs include a disclaimer: verify measurements, material conditions, and local building code before cutting or building.
What is included in carpentry calculator Pro?
Pro is a one-time purchase — not a subscription. It adds project-based job records, diagram PDF exports for your crew, custom IRC reference limits, and future Pro updates. The free version saves up to five calculation history entries.
Does the carpentry calculator collect my data?
No tracking, no ads, and no usage analytics. Calculation history, projects, and settings are stored on your device only. See our Privacy Policy for full details.
Can I use metric units in the carpentry calculator?
Yes. The unit converter and individual calculators support metric input and output alongside feet-inch-fraction. The carpentry calculator defaults to imperial for North American jobsites but switches when you need it.
Get the carpentry calculator on your iPhone
Download Carpentry Calculator and keep twelve jobsite tools in your pocket — offline, with no subscription and no ads.
Double-check stair stringers, rafters, lumber, and layouts before you cut.
Free core calculators · One-time Pro upgrade · Works offline