Construction Calculators

Calculate the exact volume of concrete needed for slabs, footings, and columns in cubic metres, feet, or yards.

Calculate concrete footing volume in cubic feet, cubic yards and cubic metres from length, width, depth and count, with waste factor and bag counts.

Calculate step count, adjusted rise per step, total run and concrete volume for a flight of concrete stairs, with IRC code checks and bag counts.

Calculate rebar quantity, total linear feet and weight from area and spacing, with bar sizes, concrete cover, lap splices, layers and waste factor.

Calculate formwork contact area for walls, columns, beams, slabs and footings in square feet or square metres, with waste factor and sheathing counts.

Calculate mortar to order in cubic feet and bags for brick or block walls, with net joint volume, face-shell bedding, mix ratio and sand.

Calculate concrete volume for round piers using Sonotube diameter, pour height, quantity, and waste allowance.

Estimate bricks for a wall using dimensions, openings, joint thickness, and waste allowance.

Calculate the number of pavers, gravel base, and bedding sand required for patios, walkways, and driveways.

Calculate epoxy volume for floor coatings, self-leveling floors, and anchor bolt installations. Get Part A and Part B quantities.

Calculate tonnes or cubic metres of gravel, sand, or aggregate for foundations and paths.

Calculate crushed stone volume, weight (tons / tonnes), bags, and truck loads for driveways, paths, drainage, and landscaping.

Estimate river rock volume, weight, coverage area, and optional cost in USD from area, depth, and density.

Estimate riprap volume and tonnage from area, layer thickness, waste allowance, and bulk density.

Estimate asphalt tonnage from area and compacted thickness using a density-based conversion.

Estimate asphalt millings (RAP) volume and weight from area and compacted thickness, with compaction and optional cost.

Estimate sod needed from area and waste allowance, optionally estimate rolls/pallets by coverage per unit, and calculate cost in USD.

Calculate pond water volume, liner size, excavation volume, and minimum pump flow rate for rectangular, circular, and oval ponds.

Estimate drain rock, excavation, fabric area, pipe length, and slope drop for a French drain trench.

Calculate pipe bedding, haunching and full-surround embedment volume in cubic yards or cubic metres from pipe diameter, trench width and run length.

Estimate roof area from footprint and pitch, then calculate bundles (shingles) or sheets (by coverage).

Calculate member lengths, ridge height, and board-foot lumber for King-Post, Queen-Post, Fink (W-truss), Howe, and Pratt roof trusses.

Calculate common rafter length from span/run, pitch, ridge allowance, overhang, and waste allowance.

Estimate birdsmouth notch depth and height above plate (HAP) from pitch, rafter depth, and seat cut length.

Calculate rafter lengths, purlin height, total rise, roof surface area, and shingle quantities for gambrel (barn) roofs.

Calculate floor joist count, rim joists, solid blocking, linear footage, board feet, and stock pieces for any room size and joist spacing.

Estimate plywood/OSB sheets from surface area, openings, sheet size (4×8 etc.), and waste allowance.

Calculate board feet (BF) from lumber thickness, width, length, and quantity — with volume conversions.

Calculate the vertical drop a gutter run needs for proper drainage, with the slope as a rate, percentage and ratio in imperial or metric.

Preliminary ridge beam sizing from span and roof loads, checking bending, horizontal shear and deflection in lumber, LVL or glulam.

Calculate common and hip rafter lengths, ridge length, jack rafters, roof area and cut angles for a hip roof from the plan and pitch.

Estimate roofing nails from roof area and nailing pattern, including starter strip, ridge cap and drip edge, with waste, weight and boxes needed.

Estimate the down-slope sliding force on a roof and the number of snow guards, rows and spacing needed to retain it.

Count studs, plates, headers and opening framing for a wall from its length, stud spacing, corners and openings.

Calculate metal roofing screws from area or panel count, including stitch and trim screws, waste allowance and boxes to buy.

Estimate tiles or planks using room area, waste allowance, and optional box coverage.

Estimate floor tiles to order from room size, openings, waste allowance, grout joint, and optional per-box coverage.

Calculate tile grout in pounds and kilograms from area, tile size, joint width and depth, with coverage rate, bag counts and waste factor.

Estimate broadloom carpet (roll goods) by roll width or carpet tiles by tile size, including waste allowance.

Estimate paint for walls and ceilings using coats, coverage, and waste allowance.

Estimate vinyl siding order area, squares, and panel count from wall dimensions, openings, gables, waste allowance, and panel exposure.

Calculate soffit area, panel count by course, waste allowance and net free vent area from eave length and overhang depth.

Calculate inner bore volume (litres / gallons), pipe material volume, and outer envelope volume for any circular pipe.

Estimate septic tank size by bedrooms or by daily flow, with optional disposal adjustment and standard-size rounding.

Estimate septic drain field absorption area, trench length and number of trenches from bedrooms and percolation or soil loading rate, with reserve area.

Calculate the water stored in a well in gallons, litres and cubic feet from casing diameter and water column or total depth and static water level.

Calculate ISO needed fire flow in GPM from construction class, effective area, occupancy and exposures, or the NFA fireground fire flow estimate.

Estimate furnace size (output and input BTU/h) from heated area, ceiling height, insulation level, climate, and AFUE.

Estimate steel weight for plate/sheet and common bar shapes using dimensions, density, quantity, and scrap allowance.

Estimate weld metal weight, volume, and required filler material based on process efficiency (MIG, Stick, TIG).

Calculate sheet metal Bend Allowance, Bend Deduction, Outside Setback, and flat pattern length. Material presets for steel, aluminium, stainless, and copper.

Check GD&T true position for anchor bolts, hole patterns, and embed plates. Enter nominal and actual X/Y coordinates for instant Pass/Fail results.