Free Contractor Calculators
Material take offs and job pricing, worked out in your browser. Every one is free, none of them ask for an email, and most hand you a printable list at the end instead of just a number on a screen.
Material calculators
Work out how much to order, then take the material list with you.
Roofing calculatorWork out roofing squares, shingle bundles, underlayment and starter from your building size and roof pitch.Concrete calculatorSlab, footing, patio or driveway.Square footage calculatorArea in square feet, square yards and square meters, plus perimeter, for any number of rooms.Paint calculatorHow many gallons for a room, allowing for doors, windows, coats and real coverage.Flooring calculatorTurn floor area into boxes of flooring or tile, with the right waste allowance for the lay pattern.Deck calculatorDeck boards, joists, hangers and fasteners from your deck size, board width and joist spacing.Fence calculatorPosts, rails, pickets and bags of concrete from your fence length and post spacing.Drywall calculatorSheet count plus joint compound, tape and screws from the area you need to cover.Insulation calculatorBags or rolls of batt insulation from wall or ceiling area, allowing for the framing you do not insulate.Mulch and gravel calculatorCubic yards, bags and approximate weight for mulch, topsoil, gravel or sand from bed area and depth.Roof pitch calculatorConvert roof pitch to slope multiplier, degrees and grade, and turn footprint into real roof area.Stair calculatorRiser height, tread depth, total run and stringer length from total rise, with the IRC limits checked as you type.Asphalt calculatorTons of hot mix asphalt and base stone from driveway dimensions and compacted thickness.Board foot calculatorBoard feet and cost from nominal thickness, width, length and piece count.Tile calculatorWork out how many tiles a floor or wall needs from the tile size and the grout joint, with thinset bags, grout pounds and backer board.Siding calculatorWork out siding squares from wall perimeter, height, gables and openings, with cartons, starter strip, J channel and corner posts.Paver calculatorWork out how many pavers a patio takes from the paver size and the joint, plus base gravel in yards and tons, bedding sand, polymeric sand and edge restraint.Brick calculatorWork out brick count from wall size, brick size and joint width, with mortar bags, wall ties, weep holes and courses.Concrete block calculatorWork out CMU block count from wall size, with mortar bags, grout by the cell spacing, vertical rebar, joint reinforcement and courses.Rebar calculatorWork out rebar for a slab or footing: bars each way at your spacing, linear feet, lap splices, sticks to buy, weight in pounds and tons, ties and chairs.Framing calculatorCount studs for a wall the way a lumber list is actually built: field studs at your spacing, corners, tees, kings, jacks and cripples, plus plate stock, header stock and sheathing.Concrete footing calculatorSize round piers or square pads: concrete in cubic yards, 60 and 80 pound bags, sonotube or form board, vertical rebar and the bearing each footing gives you.Plywood calculatorCount 4 by 8 sheets for a wall, roof or subfloor, with the nail schedule worked out per sheet, H clips at wide spacing, house wrap, underlayment and subfloor adhesive.Pool volume calculatorWork out pool gallons from the shape and the two depths, then the fill time on a hose, the pump for an eight hour turnover, the heater BTU and the chlorine and salt dose.Sod calculatorTurn a lawn area into pallets of sod with the leftover printed, plus piece count, delivered weight, topsoil to spread and the water a new lawn needs.Gravel calculatorTons, compacted cubic yards, loose yards and bags of gravel or crushed base from length, width and depth.
Money calculators
Price the job, cover your overhead, and get paid what the work is worth.
Markup vs margin calculatorMarkup and margin are not the same number.Labor burden calculatorTaxes, workers comp, insurance, benefits and unbillable hours, turned into the true cost of one billable hour.Hourly rate calculatorWork backwards from the income you want, your overhead and the hours you can actually bill, to the hourly rate that gets you there.Overhead and profit calculatorApply overhead and profit to a job cost correctly, as margins rather than markups, and see what the common shortcut costs you.Job costing calculatorBuild a job price from materials, burdened labor, subs, equipment, contingency, overhead and profit.Late fee calculatorInterest on an overdue invoice at your contract rate, plus what it comes to per day.Retainage calculatorWhat is earned, what is held as retainage, and what is payable on this application.Payment schedule calculatorSplit a contract into a deposit, progress draws and a final payment, and download the schedule as a document.Mississippi waiver deadlineCount the sixty days from the day you signed a Mississippi lien waiver, and see the day the amount is deemed paid whether you were paid or not.California lien deadlineWork out the day your California claim of lien has to be recorded, counting both the ninety day clock and the shorter one the owner starts.Texas lien deadlineWork out the Texas notice and lien affidavit dates from the month of the work, commercial or residential, under Property Code chapter 53 as amended in 2022.Florida lien deadlineWork out the Florida notice to owner and claim of lien dates under chapter 713.New York lien deadlineWork out your New York notice of lien deadline under Lien Law 10, eight months or four, and the thirty and thirty-five day clocks in section 11 that run after you file.Georgia lien deadlineWork out your Georgia notice to contractor deadline under O.C.G.A.Arizona lien deadlineWork out your Arizona preliminary twenty day notice and claim of lien deadlines under A.R.S.Illinois lien deadlineIllinois lien deadlines worked out from your own dates: the four months against a lender and the two years against the owner, the subcontractor notice that runs off a different date, and the written demand that forfeits the lien in thirty days.Michigan lien deadlineMichigan lien deadlines worked out from your own dates: the notice of furnishing that does not start until the notice of commencement appears, the ninety days that nothing can move, and the enforcement year you started yourself.Massachusetts lien deadlineMassachusetts lien deadlines worked out from your own dates: the notice of contract race at sixty, ninety and ninety days, the statement of account race at ninety, one hundred and twenty and one hundred and twenty, the thirty day notice of identification, and the ninety days to sue.Utah lien deadlineUtah lien deadlines worked out from your own dates: the twenty day preliminary notice, the five day partial cure, the one hundred and eighty days to record, the thirty day owner copy, the one hundred and eighty days to sue and record the lis pendens, and the Residence Lien Recovery Fund.Missouri lien deadlineMissouri lien deadlines worked out from your own dates: the six months from accrual to file, the sixty day rental equipment limb, the ten days notice to the owner, the notice of rights five calendar days before a residential closing, and the six months from filing to sue.Wyoming lien deadlineWyoming lien deadlines worked out from your own dates: the preliminary notice that bars the lien outright, the one hundred fifty and one hundred twenty day filing windows, the twenty day notice of intention that comes out of them, the owner's notice of substantial completion, the agreed extension, and the one hundred eighty days to sue.Mississippi lien deadlineMississippi lien deadlines worked out from your own dates: the thirty day notice that forfeits the lien, the ten day pre-lien notice on a single-family house, the ninety days to file, the one hundred eighty days to sue, the notice of contest that cuts it to ninety, and the roll forward in section 1-3-67.Self-employment tax calculatorWhat you owe on 1099 income, worked out the way Schedule SE does it, with W-2 wages taken off the wage base first.Quarterly estimated tax calculatorYour four estimated tax payments from last year's return alone, the way Form 1040-ES does it.Mileage deduction calculatorThe business rate changed on 1 July 2026, from 72.5 cents to 76 cents a mile.
Trade calculators
Sizing and spec work for the mechanical trades, where the method matters as much as the answer.
BTU and AC size calculatorEstimate cooling BTU, air conditioner tons and furnace input from floor area, ceiling height, climate zone and sun.Voltage drop calculatorWork out voltage drop on a circuit from length, current, conductor size and material, and get the smallest wire that stays under 3 percent.Generator size calculatorSize a generator from running watts and the largest motor, with the starting surge worked out properly, plus amps, the transfer switch rating, fuel burn and runtime.Trench slope calculatorWork out how far to cut a trench back from depth and soil type, using the maximum allowable slopes in 29 CFR 1926 Subpart P, with top width, spoil volume and ladder count.
Why these end in a document
Every other calculator on the internet gives you a number and stops, which leaves you to copy it onto a scrap of paper and lose it somewhere between the truck and the supply house. These hand the answer over as a finished material list or estimate with your business details on it.
It is the same code that produces the invoice and estimate templates, so what you get is a real document rather than a printout of a web page.
Nothing you type leaves this site
There is no server doing the arithmetic. The calculation and the PDF both happen inside your browser, which means the dimensions of a customer's house, the price of their job and your own margins are never uploaded anywhere. Close the tab and it is gone.
If a number looks wrong
Every calculator lists its assumptions directly under the result, because most disagreements come from a waste factor or a coverage rate rather than from arithmetic. Read those first, then check the figure against your own supplier's coverage, which is the number that actually governs what you have to buy.
The same numbers as a printed chart
Every one of these calculators has been run hundreds of times at build time and the answers laid out as 30 reference charts: pitch against angle, slab size against bags, wall area against gallons, markup against margin. They print as one page PDFs for the truck door, and they are useful in the places a phone is not.