Construction Calculators · 24 free tools A construction calculator turns a field measurement into the quantity you buy. These 24 free tools cover yards, squares, sheets, gallons, boxes and crew hours. Pricing a job right now? Price it from a photo in about six seconds. A construction calculator does one job: it turns a measurement into a quantity you can buy. Square feet become gallons. Roof area becomes bundles. A trench becomes tons of base. Get the quantity wrong and every number downstream is wrong with it. The markup is right, the labor rate is right, and the bid still loses money because the takeoff was short. So these are grouped by job, not by formula. Find the trade you are bidding, take the quantity, and move on. They are free, and none of them asks you to sign up first. Turns slab dimensions into cubic yards, bag counts and a delivered price. It orders 4 to 10 percent over plan, the range NRMCA CIP 31 publishes. Inputs: length, width, thickness, waste percentage Answers the only question the batch plant asks: how many yards is the pour. Inputs: length, width, depth, shape Counts bars, lineal feet and weight for a slab mat, off the bar properties in the WSDOT Bridge Design Manual. Inputs: slab dimensions, bar spacing, bar size, lap length Converts a pad or drive into cubic yards and tons of base. Wisconsin DOT 305.4 puts dense base at 1.85 tons a cubic yard. Inputs: area, compacted depth, aggregate type Prices a full driveway: concrete, mesh, crew hours and haul-off of the old slab. Inputs: driveway size, thickness, reinforcement, removal Turns a drive into tons of hot mix and a price. Iowa DOT 2303 sets the unit weight at 145 pounds a cubic foot. Inputs: area, mat thickness, base depth, tack Square feet to squares to bundles, using the coverage each maker publishes. A TAMKO Elite Glass-Seal square is 3 bundles over 100 square feet; an IKO Armourshake square is 5. Inputs: roof area, pitch, shingle line, ridge and starter Prices the whole re-roof: tear-off, underlayment, shingles and labor, per square and per job. Inputs: squares, shingle grade, existing layers, pitch Wall area to cartons of lap or vinyl. James Hardie publishes one SQ as 100 square feet of coverage less openings. Inputs: wall dimensions, openings, profile, exposure Gutter, downspout and guard priced by the foot, with a crew rate on top. Inputs: run length, downspout count, gutter size, guard Square feet to gallons at the planning rate Sherwin-Williams publishes, about 350 to 400 square feet a gallon. Inputs: wall area, coats, doors and windows Gallons, coats and what the paint actually costs at the line you spec. Inputs: room size, coats, paint line, ceiling height Room size to sheets, mud, tape and screws. USG submittals put all-purpose compound at 10 gallons a 1,000 square feet. Inputs: room dimensions, ceiling height, sheet length, finish level SimplyWise Cost Estimator turns a photo into an itemized, branded estimate in about 6 seconds, with material, labor and fee lines broken out. Boxes to order with the cutting allowance in. Bruce installation instructions call for 5 percent straight and 10 percent on a diagonal. Inputs: room area, carton coverage, layout, grade Material cost by flooring type, from laminate through solid hardwood. Inputs: area, material, waste percentage, underlayment Square feet to boxes of tile, with the cuts and the pattern accounted for. Inputs: area, tile size, pattern, waste percentage A calculator gives you one line. A customer wants the whole number, on paper, today. SimplyWise Cost Estimator turns a photo into an itemized, branded estimate in about 6 seconds, a unit, quantity and price on every line. $29.99/mo or $239.99/yr, about $20/mo on annual, with a 7-day free trial. Joists, beams, boards, fasteners and railing off one deck size, run against the span tables in American Wood Council DCA 6. Inputs: deck size, joist spacing, board width, height Posts, panels, concrete and the price for a run of fence. Inputs: run length, post spacing, height, material Cubic yards, bags and cost for a bed. Clemson Extension puts one cubic yard over 324 square feet at an inch deep. Inputs: bed area, depth, bulk or bagged, delivery Builds a billable hour from the published wage up, through burden, overhead and margin. The BLS OEWS code is 47-2152. Inputs: wage percentile, burden, overhead, target margin Prices a 100, 150 or 200 amp service change, panel and breakers and permit included. Inputs: service size, panel model, breaker count, permit fee Tank, drainfield and permit, sized off the trench tables in the Virginia code at 12VAC5-610. Inputs: bedrooms, soil class, trench length, stone depth Which box the debris fits, what the weight limit is, and what the haul runs. Inputs: debris volume, material, rental days, tonnage What to charge by load fraction, with the dump fee carried through. Inputs: load fraction, material weight, dump fee, drive time The order matters, because every construction calculator on this page answers one line and hands the next one to you. Run them in this sequence and the bid adds up. Concrete sells by the yard, shingles by the square, drywall by the sheet. Take the field measurement in feet and let the calculator do the conversion. NRMCA says order 4 to 10 percent over plan on concrete. Bruce says 5 percent straight and 10 percent diagonal on wood floors. Those numbers are printed. Use them. Every price on these pages carries a capture date and a seller. Treat it as a sanity check on your own quote, never as your quote. A published wage is not a billable hour. Run it through burden, overhead and margin before it touches the bid. The practical read: a construction calculator settles the quantity, you settle the price. Anyone quoting you a single national number for both is guessing at one of them. Yes. Every calculator linked on this page is free to use, with no signup, no email wall and no trial to start one. Start with the line that carries the most money on your bid. On a slab that is concrete yardage, on a re-roof it is squares, on a repaint it is gallons. The cost calculators show prices with a seller name and a capture date on every figure. They are national ranges for sanity-checking your own quote, not local quotes. Named sources only: NRMCA, the American Wood Council, the Gypsum Association, the NWFA, state DOT specifications, BLS wage data and manufacturer data sheets. Each page lists the ones it uses. Yes. SimplyWise Cost Estimator turns a photo into an itemized, branded estimate in about 6 seconds. Free to try, at $29.99/mo or $239.99/yr. Snap a photo and get an itemized, branded estimate in about 6 seconds. Free to try.Construction Calculator Tools: 24 Free Calculators for Contractors
What a construction calculator is actually for
Concrete and masonry: the construction calculator set for site work
Roofing, siding and gutters
Paint and drywall
Flooring and tile
Every quantity on one estimate
Decks, fencing and landscaping
Plumbing, electrical and septic
Hauling and site cleanup
How to run a takeoff with a construction calculator
Measure once, in the units the material sells in
Add the waste the maker publishes, not a habit
Price the quantity at your supplier, not a national mean
Put crew hours on a loaded rate
Where every construction calculator formula comes from
Construction calculator questions, answered
Are these construction calculators free?
Which construction calculator should I start with?
Do the calculators show current material prices?
Where do the formulas come from?
Can I get every line on one estimate?
The calculator gives you the number. Give the customer the estimate.
