Feet-inch-fraction math, 20 trade calculators, and material takeoffs that become branded PDF quotes. Built for carpenters and contractors. Try free for 7 days.
The construction calculator that finishes the job: feet-inch-fraction math, 20 trade calculators, and a material takeoff that turns into a professional PDF quote — all in one app.
WHY PROS SWITCH TO HAMMERCALC
FEET-INCH-FRACTION MATH, DONE RIGHT
- Mix feet, inches, millimeters, and meters in one calculation
- Tape-measure fraction strip: tap or slide to enter 1/16s faster than typing
- Results in feet-inches AND metric, side by side
- Custom rounding: 1/16", 1/32", 1/64", or decimal
20 TRADE CALCULATORS — EACH WITH A LIVE DIAGRAM
- Framing: rafters (hip/valley/jack cut lists, birdsmouth), roof squares & flashing, wall framing with stud counts, rake walls
- Stairs: rise, run, stringers — with IRC code checks built in (max riser, tread, headroom, 2R+T comfort)
- Outdoor: decks, fences (incl. chain-link), concrete bags/yards/rebar, baluster spacing (4" sphere rule)
- Finishes: drywall, paint, tile, flooring, siding
- Layout & lumber: square footage with cutouts, board feet & cost, cut list optimizer (fewest boards, least waste), compound miter/crown, triangle & pitch, circle/arc layout
- Every field label explains itself — long-press for a diagram
FROM CALCULATION TO QUOTE — NO OTHER CALCULATOR DOES THIS
- One tap sends any tool's material list to a project takeoff
- Buy-list smarts: rounds up to lengths the yard actually sells, never orders short
- Check off materials on site as you load the truck
- Price book remembers what you paid last time
- Add labor, markup, and tax — export a branded PDF quote with your logo
- Share as PDF, CSV, or plain text
PLANS & NOTES ON THE JOBSITE
- Load blueprint PDFs and photos — auto-saves your page, zoom, and position
- Job notes with one-tap capture of any calculation
- Quick links to your building codes and span tables
BUILT FOR THE FIELD
- Works fully offline. No ads. No popups. No data collection.
- Dark mode for early starts, haptic keys, 12 accent colors
- English & Español — switch live in Settings
- iPhone, iPad, and Mac
PERFECT FOR
Carpenters • Framers • Contractors • Remodelers • Deck builders • Estimators • Engineers • Machinists • Architects • Serious DIYers
TRY IT FREE FOR 7 DAYS
Full access to everything. No commitment — cancel anytime.
A subscription is required after the trial. Auto-renews unless canceled 24 hours before the period ends. Manage or cancel in Settings > [Your Apple ID] > Subscriptions.
Support: hammercalc@gmail.com
Terms: https://www.hammerstorm.co/terms
Privacy: https://www.hammerstorm.co/privacy
I have Construction Master Pro and was trying to switch to a more intuitive calculator, and get rid of the subscription, and it turns out you can’t calculate anything on here either unless you subscribe. Sure there’s a free trial but it’s really pushing the “subscribe” button. I’m sorry I couldn’t try out the calculators that this has.
Locked behind paywall
THEFRITZYT
If your gonna make it free make it free to use or charge to buy the app And don’t put it behind a paywall after you download it Its a Disappointment
-user interface improvements
Version 2.0.1 (20)
The developer, garrett hiebert, 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 Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More