TB Logic™By Construction Pros for Construction ProsEvery ToolBelt
needs Logic
Exact feet, inches, and fractions — built by construction workers for construction workers. Whether you're framing walls or pouring slabs, this is your calculator.
Built Simple, Built Right.
Every professional deserves digital tools that actually match the way they work.
Plan reader (Pro)
Open your plans, set the scale, and measure, count, and mark up right on the sheet. Scale, Measure, Linear, Area, Note, Count, and Markup.
Automatic plan translation (Pro)
Translate a plan once into any of 8 languages and everyone reads it in their own, even offline. Built for crews that work in more than one language on site.
Exact trade math
Enter 7′-5 3/16″ and get 7′-5 3/16″ back. No decimal rounding that costs you material. Every fraction stays a fraction.
Visual formula output
Wall layouts with every stud labeled — kings, trimmers, cripples, and plates color-coded. Add notes and share the diagram with your crew. Not just a number.
AI that knows construction
Ask it "How many studs for a 14-foot wall on 16-inch centers?" or "How much concrete for a 12x20 slab at 4 inches?" and get a step-by-step breakdown. Pro feature.
8 app languages
Run the full app in your language — menus, buttons, and labels included. Switch anytime in settings. Built for crews who work in more than one language on site.
Built for the construction crew.
We want to give every construction worker the digital tools they need — whether you're framing walls or pouring concrete.
Your plans, in your pocket, ready to measure.
Open a plan on your phone or in the browser, set the scale, and measure straight off the sheet. Mark it up, count what you see, and drop notes right where the work is. No printing, no scale ruler.
- Scale, Measure, Linear and Area tools
- Count items and drop Notes
- Markup: pencil, circle, cloud, box, triangle, text
- Pinch to zoom, jump to any page
- Open the calculator right over the plan
The whole crew reads the same plan.
Translate a plan once and everyone on the job can read it in their own language. Once it's saved on a phone it works without a signal, and each person picks their own language, all 8 are covered.
- Translated once, saved on each phone
- Works offline once saved
- Translates into all 8 app languages
- Built for crews that work in more than one language
Every formula you'd reach for on the job site.
Whether you're framing or pouring — stud counts, rafter lengths, concrete volume, footing sizes — built in and ready instantly, with visible calculations and history for reference.
- Stud / joist / rafter spacing
- Stair rise & run
- Rafter length & pitch
- Rake and arch walls
- Roofing squares, hip & valley, jack rafters
- Concrete volume & slabs
- Footing & column sizing
See the layout — not just a number.
Run a wall layout formula and get a full visual diagram: every stud length labeled, kings, trimmers, cripples, and plates color-coded. Pinch to zoom, drag to pan — the kind of output you'd sketch on paper, generated instantly.
- Full wall and opening layouts
- Every stud length on the diagram
- Color-coded kings, trimmers, cripples
- Add notes to any formula result
- Share the layout with your crew
Rake wall layout — every stud length and plate labeled
Never lose a number mid-job.
Every calculation is saved as you go. Scroll back, reuse values, and share your full work — not just the answer.
- Scrollable calculation history
- Tap any past result to reuse it
- Share full tape as text
- Undo / redo at any point
Annotate it. Send it. Done.
Add notes to any formula result — job name, wall tag, material callouts, whatever your crew needs. Then share the full layout with one tap. Your foreman opens the same diagram, not a blurry screenshot.
- Add notes to formula results
- Share layouts and calculations
- Recipient sees inputs + visual output
Your crew. Your language.
The full app runs in 8 languages — not just numbers, but menus, labels, and the interface your crew actually reads. Switch in settings; no extra download.
- 8 languages built in
- Full interface translation (plans translate separately)
- Switch anytime in settings
- Plain and Construction modes
An AI that's been on the job site.
Ask in plain English. Get a step-by-step construction breakdown — framing counts, concrete volumes, whatever you need. Not a chatbot — construction knowledge, on demand.
- Powered by Anthropic's Claude
- Knows framing and concrete math
- Explains the why, not just the answer
Tell us what you need.
TB Logic was built by construction workers — framers and concrete crews alike. If there's a formula or feature that would save you time on the job, we want to hear it.
Framing, concrete, general contractor — tell us what you're working on.
A formula you can't find anywhere else. A unit conversion you do every day. Tell us.
We're building toward one tool that every construction worker actually keeps on their phone.
If you want us to follow up when your feature ships, leave your email. No spam, ever.
Powerful for free. Unstoppable with Pro.
Start with the plain calculator. Upgrade to Pro for the plan reader, Construction mode, trade formulas, and an AI assistant that knows the job site.
- Plain calculator mode
- Running tape & calculation history
- Deep-link sharing
- 8 languages — full app interface
- Everything in Free
- Exact feet-inch-fraction math
- Plan reader with automatic translation
- Construction mode — framing, stairs, concrete + roofing formulas
- AI assistant with job-site knowledge
- 30-day free trial — no commitment
Ready to work smarter on your next job?
Try the Plain mode calculator for free. Start calculating in under 30 seconds.