Free tools for the trades
Working calculators for the numbers you need before you can quote a job. No account, no email, no gate on the answer — and the arithmetic is written out on every page, so you can check it rather than trust it.
Price a whole job across every division at once, with labour burden, contingency, overhead and margin rolled in. The fifty calculators below work out the quantities you feed it.
Roofing
Free Roofing Calculator: work out roof area, roofing squares and shingle bundles from your footprint and pitch.
Free Roof Pitch Calculator: convert roof pitch between rise-over-run, degrees and slope factor, and get rafter length from the span.
Free Roof Square Calculator: convert roof square footage into roofing squares and bundles, with pitch and waste applied.
Free Gutter Calculator: size gutters and downspouts from roof area and rainfall intensity, and get the linear footage.
Free Shingle Calculator: calculate shingle bundles, starter strip, ridge cap and nails from roof area and pitch.
HVAC
Siding
Painting
Windows
Excavation
Free Gravel Calculator: work out how much gravel, stone or sand you need in cubic yards and tons, for a driveway, path or base layer.
Free Excavation Calculator: calculate excavation volume in bank and loose cubic yards, with swell factor and truckloads for disposal.
Tile
Insulation
Concrete
Free Concrete Calculator: calculate concrete for a slab, footing or pad in cubic yards, plus how many 60 lb or 80 lb bags if you are mixing it yourself.
Free Concrete Slab Calculator: calculate a slab pour: concrete in cubic yards and bags, plus rebar or mesh and the gravel base underneath.
Free Rebar Calculator: calculate rebar for a slab or footing: total linear feet, number of sticks, laps and weight.
Fencing
Electrical
Free Voltage Drop Calculator: calculate voltage drop over a run in copper or aluminium, check it against the 3% branch-circuit recommendation, and see the.
Free Conduit Fill Calculator: check conduit fill against NEC Chapter 9: conductor area, conduit area and the 53 / 31 / 40 percent limits.
Free Wire Size Calculator: find the wire gauge a run needs, sized for both ampacity and a 3 percent voltage drop.
Framing
Business
Free Job Cost Calculator: work out what a job really costs once labour burden and overhead are in, then what to charge for a target profit margin.
Free Markup Calculator: convert markup to margin and back, and get the price for a target margin. The difference costs contractors real money.
Free Time Card Calculator: add up a week of clock-in and clock-out times with breaks, and get regular hours, overtime and gross pay.
Free Overtime Calculator: calculate overtime pay at 1.5× or 2×, including weekly and daily overtime thresholds.
Free Self-Employment Tax Calculator: calculate self-employment tax on net profit, including the deductible half and quarterly estimates.
Free Mileage Reimbursement Calculator: calculate mileage reimbursement or a vehicle tax deduction from business miles driven.
Free Overhead Rate Calculator: calculate your overhead rate and how much overhead each job or billable hour has to absorb.
Flooring
Paving
Drywall
Decking
Carpentry
Free Board Foot Calculator: calculate board feet from thickness, width and length, for any number of boards, plus the total cost.
Free Stair Stringer Calculator: calculate stair risers, treads, stringer length and the total run from your floor-to-floor height.
Landscaping
Free Mulch Calculator: calculate mulch in cubic yards and 2 cubic foot bags for beds and borders, at the right depth.
Free Sod Calculator: calculate sod in square feet, rolls and pallets for a lawn, including waste for cuts.
Free Topsoil Calculator: calculate topsoil in cubic yards, tons and bags for garden beds, lawn repair or grading.
Utility
Free Cubic Yard Calculator: convert length, width and depth into cubic yards, cubic feet and tons for concrete, gravel, soil, mulch or sand.
Free Linear Feet Calculator: convert square feet to linear feet for boards, trim, decking or flooring of a known width.
Solar
Masonry
Free Brick Calculator: calculate how many bricks a wall needs, plus mortar bags and pallets, with waste.
Free Concrete Block Calculator: calculate concrete blocks for a wall, plus mortar bags and grout fill for reinforced cores.
Free Mortar Calculator: calculate mortar bags and sand for laying brick, block or stone at a given joint width.
Hardscape
Drainage
Moving
More tools are added every week. If you run the phones for a trade business and there is a number you work out by hand more often than you would like, tell us what it is and it will probably show up here.