Construction Calculators

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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