Construction Calculators
Free interactive estimators for contractors: concrete, gravel, and drywall quantities, plus markup, job costing, and your true hourly rate.
28 articlesConcrete Block Calculator: CMU Count for a Wall
Calculate how many concrete blocks a wall needs from its length and height, plus a waste allowance and an estimated mortar bag count. Built on the standard 16x8 CMU face.
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Deck Board Calculator: Boards and Linear Feet
Calculate how many deck boards a deck needs from its length and width, board face width, gap, and board length, with a waste allowance. Returns rows, linear feet, and board count.
Change Order Markup Calculator: Price a Change Order
Calculate a proposed change-order price from permitted direct costs and an allowed markup rate, with contract checks for notice, support, and authorization.
Concrete Footing Calculator: Yards for a Continuous Footing
Calculate cubic yards for a continuous concrete footing from width, depth, and total run, then add a practical 10% to 15% order margin.
Board Foot Calculator: Lumber Volume and Cost
Calculate board feet from thickness, width, length, and quantity, and get material cost from a price per board foot. Built for hardwood and rough lumber estimating.
Labor Burden Calculator: True Hourly Cost of an Employee
Calculate hourly labor burden from wage-based employer costs, benefits and other allocations, then keep internal cost separate from bill rate.
Brick Calculator: Count Bricks From Wall Area
Estimate whole bricks from wall area, brick density, and waste. Includes opening rules, a worked example, and ordering notes.
Paint Calculator: Gallons for Walls and Ceilings
Estimate paint gallons from wall or ceiling area, coat count, and product coverage. Includes opening rules, worked examples, and ordering notes.
Insulation Calculator: Bags for Attics and Walls
Estimate insulation bags from square footage, bag coverage, and waste percent. Built for clean material planning before you order.
Mulch Calculator: Cubic Yards and 2-Cu-Ft Bags
Calculate mulch in cubic yards and 2-cu-ft bags from bed area and depth, with verified formulas, worked examples, depth guidance, and ordering notes.
HVAC BTU Calculator: Rough First-Pass Sizing
Estimate rough HVAC BTU/hr and tons from area and a planning input. Final equipment selection requires the applicable code-compliant load calculation.
Tile Calculator: Boxes Needed With Waste
Estimate tile boxes from room area, square feet per box, and waste percentage. Built for material takeoffs before you order.
Stair Stringer Calculator: Risers, Treads, and Run
Estimate stair risers, riser height, tread count, and total run from total rise, ideal riser height, and tread depth.
Sod Calculator: Rolls and Pallets With Waste
Estimate sod rolls and pallets from lawn area and waste percentage using 10 square feet per roll and 450 square feet per pallet.
Rebar Calculator: Linear Feet for a Slab Grid
Estimate rebar linear feet for a slab grid from length, width, and spacing. Includes a 10 percent laps and waste result.
Sealcoat Calculator: Gallons for Asphalt Driveways
Estimate asphalt driveway sealer gallons from area, coat count, and coverage per gallon. Includes whole gallons to buy.
Retainage Calculator: Held Amount and Net Payment
Calculate retainage held and net payment released from an amount billed and retainage percentage. Built for pay app math.
Fence Calculator: Posts, Sections, and Rails
Estimate fence posts, sections, and rails from fence length, post spacing, and rails per section. Built for material takeoffs.
Break-Even Calculator: Revenue Needed at Gross Margin
Calculate revenue needed to cover fixed costs at a chosen margin, with contractor examples, margin caveats, capacity checks, and monthly planning.
Equipment Cost Calculator: Hourly Ownership and Operating Cost
Calculate equipment hourly cost from ownership basis, useful life, fuel, and maintenance, then keep labor, mobilization, overhead, and profit separate.
Roofing Calculator: Squares and Shingle Bundles
Convert roof area into roofing squares and shingle bundles using the standard 100 square foot square and 3 bundles per square.
Overhead and Profit Calculator: 10 and 10 Add-On
Calculate the classic overhead and profit add-on from direct cost, overhead percent, and profit percent. Built for clean O&P math.
Gravel Calculator: Tons From Area, Depth, And Density
Calculate gravel tons from length, width, depth, and a 1.4 tons-per-cubic-yard density factor.
Job Costing Calculator: Compare Your Estimate With Actual Costs
Build a job price, then compare estimated and actual costs. Use the free calculator and editable variance worksheet to see where the margin changed.
Drywall Calculator: 4x8 Sheet Count With Waste
Calculate 4x8 drywall sheets from wall area, then round up with a 10% waste allowance for a practical sheet count.
Construction Markup Calculator: Convert Margin to Markup
Turn a target margin into the bid price and markup percentage, using the contractor math that keeps price, cost, margin, and markup straight.
Contractor Hourly Rate Calculator: Set A Billable Rate
Calculate the hourly rate needed to recover annual overhead, labor cost, and target profit across your real billable hours.
Concrete Calculator: Cubic Yards For Slabs And Flatwork
Calculate cubic yards for rectangular slabs, split irregular work into sections, review a worked example, and separate measured volume from ordering allowance.