Feet & inches calculator
Add, subtract, multiply and divide in feet, inches and fractions — enter 12 ft 6-3/8 in like you measure it. The fastest inches feet calculator for carpenters and framers.
The construction calculator built for job-site math, takeoff & quotes
HammerCalc mixes feet, inches & fractions with metric & imperial in one equation — plus 20 trade tools, materials takeoff with a price book, and branded PDF quotes on iPhone, iPad & Mac.
Calculator tools
Every construction calculator you reach for on site
20 specialized tools + takeoff & quotes. One subscription. Every Apple device.
Metric & imperial calculator
Combine millimeters, meters, feet and inches in a single equation. The metric imperial calculator tradespeople actually need — no unit converter app required.
Fraction calculator for construction
Tap fractions off a ruler with the Tape Measure widget. Round to 1/16″, 1/32″ or 1/64″. Faster than typing on any standard construction calculator.
Materials takeoff & PDF quotes
Send any tool’s materials into a multi-project takeoff, set unit prices in a price book, add labor, markup and tax, then share a branded PDF quote or materials list.
Stairs calculator
Interactive stair calculator with live diagrams — rise, run, stringer length and headroom update as you drag sliders.
Rafter calculator
Common and hip rafter math with interactive diagrams. A proper rafter calculator for roof carpenters — not just a lookup table.
Roof calculator
Squares, pitch, flashing and vents from a visual roof model — the roof calculator you want on a ladder.
Wall framing
Studs, plates and layout counts for walls — with materials that send straight into takeoff.
Rake wall
Gable / rake wall stud cut lists with live diagrams for pitched ends.
Deck calculator
Boards, joists and ledger takeoffs for decks — visual layout math built for remodelers.
Fence calculator
Posts, rails and pickets from run length and spacing — ready for buy lists.
Concrete calculator
Bags, yards and rebar estimates for slabs, footings and pours.
Baluster spacing
4″ rule spacing and buy counts for railings — no spreadsheet required.
Drywall calculator
Sheet counts, mud, tape and bead from wall dimensions — a dedicated drywall calculator for hang and finish bids.
Paint calculator
Walls, ceilings and gallons with coverage assumptions you can adjust.
Tile calculator
Boxes, thinset and grout for floors and walls — with waste % and buy rounding.
Flooring calculator
Boxes, underlayment and trim for wood, vinyl and laminate jobs.
Siding calculator
Squares, corners and J-channel counts for siding takeoffs.
Square foot calculator
Area with cutouts and waste for rooms, slabs and layouts — visual square footage calculator for estimators.
Lumber / board feet
Board feet, waste and cost for lumber lists — the board feet calculator carpenters still need.
Cut list optimizer
Fewest boards and least waste from a cut list — before you buy or cut.
Compound miter / crown
Flat and nested crown angles for trim carpenters.
Circle & arc layout
Radius, arcs and segments with visual guides — columns, decks, trim and curves.
Triangle & polygon calculator
Irregular shapes, angles and side lengths with diagrams that update as you work.
Built-in plan viewer
Open PDFs and photos without leaving the app. Remembers page, zoom and position.
Notes with calc history
Save any result into a project note with timestamps so critical measurements don’t get lost.
Carpenter calculator
A dedicated home for carpentry calculator workflows — feet, inches, fractions, stairs, framing and more.
Beam & joist calculator
Span and spacing takeoff math for beams and joists alongside deck and framing tools.
Why builders call HammerCalc the best construction calculator
Whether you search for a construction calculator, materials takeoff app, stair calculator, deck calculator, board feet calculator, or construction quote app — HammerCalc replaces a drawer of single-purpose tools with one fast Apple app. Built for the trade. Private by design. Try it free for 7 days.
FAQ
Construction calculator questions
What is the best construction calculator app for iPhone?
HammerCalc is designed for tradespeople who need feet, inches, fractions and metric in one equation, with 20 visual trade tools, materials takeoff, and PDF quotes — on iPhone, iPad and Mac with one subscription.
Can I use HammerCalc as a carpentry calculator?
Yes. Carpenters use HammerCalc for framing math, stair layout, rafter cuts, deck and drywall takeoffs, board feet, and everyday feet-inch-fraction arithmetic with the Tape Measure widget.
Does it include materials takeoff and quotes?
Yes. Add materials from any tool into a takeoff, set prices in a price book, add labor/markup/tax, and share a branded PDF quote or materials list. See takeoff & quotes.
Does it work as a metric and imperial calculator?
Yes. Enter feet, inches, millimeters and meters in the same equation. Convert the answer to any unit with one tap — ideal when plans mix units.
How much does HammerCalc cost?
7-day free trial, then $3.99/month or $24.99/year. One subscription covers all your Apple devices. Learn more about HammerCalc.
Get the best construction calculator on your iPhone, iPad & Mac
20 trade tools, takeoff & PDF quotes — try HammerCalc free for 7 days.
Download on the App Store