Construction Calculator - Kerf

The construction calculator that does every job
Kerf is a construction calculator with a feet inch fraction keypad and 157 job calculators for concrete, framing, roofing, stairs, decks, drywall, electrical and more. 21 essential calculators are free, and Kerf Pro unlocks all 157 with one payment. No ads, no account, and it works offline on the jobsite.

Feet inch fraction calculator (free)
• Add, subtract, multiply and divide feet, inches and fractions the way the tape reads
• Round results to the tape mark you choose, from 1/2" to 1/64"
• Square feet and cubic feet straight from lengths
• Rise, run, diagonal and pitch keys for rafters and right triangles
• Memory slots, trig, degrees-minutes-seconds and a running tape
• Convert feet-inch, decimal feet, inches and metric

157 calculators, 21 free
The 21 free calculators cover everyday jobs: wall framing, roofing squares and pitch, stairs, baseboard, deck boards, fence, slabs, block walls, mulch, drywall, paint, tile, flooring, voltage drop and room area. Kerf Pro unlocks all 157, across 14 categories:
• Concrete calculator: slabs, footings, sonotubes, columns, steps, walls, bags, truck loads, rebar, mesh
• Framing calculator: wall framing, rough openings, floor framing, gable studs, sheathing, siding
• Roofing calculator: roof pitch, common, hip, valley and jack rafters, birdsmouth cut, squares, shingles, gutters
• Stair calculator: risers, treads, stringer and headroom with IRC code checks, balusters, landings, spiral stairs
• Trim: crown molding angles, compound miter, polygon miter, baseboard, casing, arches
• Deck and fence: deck boards, joists and beams, footings, pickets, post holes
• Masonry: block, brick, mortar, grout fill, stucco, stone veneer
• Landscape and sitework: pavers, retaining walls, gravel, topsoil, mulch, sod, excavation, trenches, asphalt
• Interior: drywall, paint, flooring, tile, grout, backsplash, carpet, countertops, cabinets
• Insulation: batts, blown-in, rigid foam, vapor barrier
• Electrical: Ohm's law, circuit load, wire size and voltage drop, conduit fill, box fill
• Plumbing: pipe slope, pipe volume, PEX, tank volume
• Area and volume: room area, shapes, board feet, material weight

More than a construction calculator
• Cut list optimizer (Pro): fewest boards for your cuts, with blade kerf, offcuts and a buy list
• Level and pitch gauge (free): bubble level, angle finder and roof pitch from your phone
• Unit converter (free): feet, inches, metric, area, volume and weight

Jobs and material lists
Save any result to a job. The job adds up the materials from every calc and sends the list to your supplier or crew as text. Reopen a saved calc and its numbers come back. Bag yields and coverage rates are editable, so type the number printed on your bag.

Built for the trades
Framers, carpenters, concrete crews, roofers, remodelers and DIYers use the same construction calculator for takeoffs, layout and the quick math between cuts. Pick imperial or metric results; inputs take either, so 12' 6 1/2" and 3.81 m both work.

Why this construction calculator?
• 21 calculators free for good, with no ads
• Works with no signal
• Kerf Pro is one payment, never a subscription

Kerf Pro, if you bid work
• All 157 calculators
• Cut list optimizer with blade kerf, any number of pieces and mixed stock lengths
• Unlimited jobs (free includes 1)
• Estimates with labor, markup, tax and your margin
• Estimate PDF with your logo, terms and a signature line
• Price book with your supplier prices
• Material lists as CSV or PDF, in English or Spanish
• Backup and restore for every job

Get started
Download Kerf, the construction calculator built for framers, carpenters, contractors and DIYers, and keep the math off the back of the 2x4.

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