Construction Calculators Comparison
All 57 Construction calculators in one comparison table, with the formula and a worked example for each.
What you can work out with these calculators
Construction calculators turn measurements into material quantities: concrete volume, rebar length, roofing squares, flooring area and paint coverage. They use trade-standard estimating methods, state the waste allowance separately, and let you move between metric and imperial without losing the ratio.
- Work out concrete volume for slabs, footings and columns, with a waste allowance on top.
- Estimate rebar quantity and cut length from grid spacing and bar size.
- Convert roof area into squares and bundles for ordering.
- Get paint or flooring coverage from room dimensions and the number of coats.
Compare calculators by what you enter
All 57 calculators here, one row each: what each tool works out and the fields it asks for before it does. Open any row to use the calculator itself.
| Calculator | What it works out | What you enter |
|---|---|---|
| Concrete Slab Calculator | Calculate concrete for slab | Length (m) · Width (m) · Thickness (m) |
| Wall Area Calculator | Calculate wall surface area | Length (m) · Height (m) · Doors Area (m²) · Windows Area (m²) |
| Roofing Calculator | Calculate roofing materials | Roof Length (m) · Roof Width (m) · Pitch (degrees) |
| Drywall Calculator | Calculate drywall needed | Wall Area (m²) · Sheet Size (m²) |
| Flooring Calculator | Calculate flooring material | Floor Area (m²) · Waste Factor (%) |
| Gravel Calculator | Calculate gravel needed | Length (m) · Width (m) · Depth (m) |
| Insulation Calculator | Calculate insulation needed | Area (m²) · Desired R-Value · Material Thickness (m) |
| Stair Calculator | Calculate stair dimensions | Total Height (m) · Desired Riser Height (cm) |
| Wallpaper Calculator | Calculate wallpaper needed | Wall Area (m²) · Roll Coverage (m²) |
| Carpet Calculator | Calculate carpet needed | Room Length (m) · Room Width (m) |
| Mulch Calculator | Calculate mulch needed | Area (m²) · Depth (cm) |
| Soil Calculator | Calculate soil needed | Length (m) · Width (m) · Depth (cm) |
| Brick Calculator | Calculate bricks needed | Wall Area (m²) · Brick Face Area (m²) |
| Fence Calculator | Calculate fence materials | Fence Length (m) · Post Spacing (m) |
| Excavation Calculator | Calculate excavation volume | Length (m) · Width (m) · Depth (m) |
| Tile Calculator | Calculate tiles needed for floor or wall area | Area Length (m) · Area Width (m) · Tile Size (cm) · Waste (%) |
| Paint Quantity Calculator | Calculate paint liters needed for a room | Total Wall Area (m²) · Coats · Coverage (m²/L) |
| Rebar Calculator | Estimate rebar weight and quantity | Total Length (m) · Bar Diameter (mm) |
| Formwork Area Calculator | Calculate formwork area for concrete structures | Length (m) · Height (m) · Exposed Faces |
| Concrete Column Calculator | Calculate concrete volume for a column | Column Height (m) · Width (m) · Depth (m) |
| Lumber Calculator (Board Feet) | Calculate board feet of lumber needed | Number of Pieces · Length (ft) · Width (in) · Thickness (in) |
| Paver Calculator | Calculate number of pavers needed | Area (m²) · Paver Length (cm) · Paver Width (cm) · Waste (%) |
| Water Tank Capacity | Calculate water tank volume and capacity | Length (m) · Width (m) · Height (m) |
| Roof Pitch Calculator | Convert roof pitch to angle and slope | Rise (cm per 100cm run) · Run (cm) |
| Deck Board Calculator | Calculate deck boards needed for your deck | Deck Length (m) · Deck Width (m) · Board Width (cm) · Gap (mm) |
| Concrete Bag Calculator | How many concrete bags for a pour | Length (ft) · Width (ft) · Depth (in) · Bag Size (lb) |
| Concrete Block Wall | CMU blocks needed for a wall | Wall Length (ft) · Wall Height (ft) |
| Rebar Layout Calculator | Rebar spacing and total steel length | Slab Length (ft) · Slab Width (ft) · Spacing (in) |
| Footing Size Calculator | Concrete footing dimensions for a load | Column Load (kips) · Soil Bearing (ksf) |
| Gravel Tonnage Calculator | Tons of gravel for an area | Length (ft) · Width (ft) · Depth (in) |
| Asphalt Quantity Calculator | Tons of asphalt for a paved area | Length (ft) · Width (ft) · Thickness (in) |
| Mortar Mix Calculator | Sand and cement for mortar by volume | Mortar Volume (ft³) · Mix (cement:sand) |
| Drywall Screw Count | How many drywall screws you need | Drywall Sheets · Screw Spacing (in) |
| Pipe Volume Calculator | Water volume inside a pipe | Inner Diameter (in) · Length (ft) |
| Retaining Wall Blocks | Blocks for a retaining wall | Wall Length (ft) · Wall Height (ft) · Block Width (in) · Block Height (in) |
| Scaffolding Estimate | Scaffold sections for a wall | Wall Length (ft) · Wall Height (ft) |
| Crown Molding Length | Linear feet of crown molding needed | Room Length (ft) · Room Width (ft) · Waste % |
| Septic Tank Size | Septic tank size by bedrooms | Bedrooms · Occupants |
| Plaster Quantity Calculator | Cement and sand for plastering a wall | Wall Area (m²) · Thickness (mm) · Cement:Sand Ratio |
| Gutter Length Calculator | Gutter sections and downspouts for a roofline | Roof Perimeter (m) · Section Length (m) · Inside/Outside Corners |
| Sod Calculator | Sod rolls needed for a lawn | Lawn Area (sq ft) · Roll Coverage (sq ft) · Waste (%) |
| Ceiling Tile Calculator | Drop-ceiling tiles from room dimensions | Room Length (ft) · Room Width (ft) · Tile Size (ft) · Waste (%) |
| Stair Stringer Calculator | Riser height and tread layout for a staircase | Total Rise (inches) · Number of Risers · Tread Depth (inches) |
| Siding Squares Calculator | Siding squares needed from wall area and openings | Wall Length (ft) · Wall Height (ft) · Number of Walls · Openings to Deduct (sq ft) · Waste Factor (%) |
| Soffit Area Calculator | Soffit material area from building perimeter and overhang | Building Length (ft) · Building Width (ft) · Overhang (ft) |
| Post Hole Concrete Calculator | Concrete volume for fence post holes | Number of Holes · Hole Diameter (inches) · Hole Depth (inches) · Post Width (inches) |
| Fence Panel Calculator | Panels and posts for a fence run | Fence Length (ft) · Panel Width (ft) |
| Gravel Driveway Calculator | Gravel volume and tonnage for a driveway | Length (ft) · Width (ft) · Depth (inches) |
| Insulation Coverage Calculator | Batts or rolls needed for a framed area | Area to Insulate (sq ft) · Coverage per Roll / Batt (sq ft) |
| Rafter Length Calculator | Hip and common rafter length from run and pitch | Horizontal Run (ft) · Rise (ft) |
| Shingle Squares Calculator | Squares of shingles needed with waste factor | Roof Area (sq ft) · Waste Factor (%) |
| Drywall Sheets Calculator | Sheet count from wall area with waste allowance | Wall Area (sq ft) · Sheet Size (sq ft) · Waste Factor (%) |
| Tile Boxes Calculator | Boxes of tile for a floor with breakage allowance | Floor Area (sq ft) · Coverage per Box (sq ft) · Breakage & Cuts (%) |
| Conduit Fill Calculator | Free conduit fill calculator: NEC Chapter 9 fill percentage for THHN conductors in EMT, with the 40 percent limit checked. | Conduit size (EMT) · THHN conductor size · Number of conductors |
| Rolling Offset Calculator | Free pipefitter rolling offset calculator: true offset, travel and run for 45, 22.5, 30 and 60 degree fittings, with the multiplier shown. | Offset / rise (in) · Roll / horizontal (in) · Fitting angle (deg) |
| Pipe Cutback Calculator | Free pipe cutback and fitting takeout calculator: the length to cut back for 90 and 45 degree long and short radius elbows by NPS. | Nominal pipe size (in) · Elbow type · Number of fittings |
| Journeyman Wage Progression Calculator | Project trade career earnings from apprentice pay through journeyman wages with annual raises. | Apprentice start wage per hour · Journeyman wage per hour · Apprentice years · Journeyman years · Paid hours per year |
Prefer the annotated list? Browse the full list with one line on what each calculator does.
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