All 63 construction calculators
Pick a category to narrow it down, or jump straight to the A–Z list. Every tool runs in your browser — no account, no upload, nothing leaves your device.
Browse the A–Z indexBrowse by category
Nine categories, each with its own guide to what to measure and what to order.
Concrete & Masonry
Volume, bags, mix ratios, bricks, blocks and mortar — priced and ordered right.
- Concrete Volume & Bag Calculator
- Brick & Block Calculator
- Concrete Mix Ratio Calculator
Steel & Rebar
Bar bending schedules, cutting lengths, lap lengths and rebar weight by tonne.
- Steel Quantity Estimator — Steel per m³ of Concrete
- Bar Bending Schedule
- Cutting Length Calculator — Stirrups, Rings & Bent Bars
Framing & Carpentry
Studs, plates, stairs, board feet, decks and fences — timber counted properly.
- Deck & Patio Cost Calculator
- Deck Railing & Baluster Spacing Calculator
- Deck Joist & Beam Span Calculator
Decorating & Interiors
Paint, tile, flooring, wallpaper, carpet, drywall, plaster, insulation and BTU sizing.
- Paint Coverage & Cost Calculator
- Tile & Flooring Calculator
- Flooring Calculator — Laminate, Vinyl Plank & Hardwood
Roofing & Siding
Roof pitch and area, shingles and bundles, siding squares, trim and insulation.
- Roofing Calculator — Pitch, Area & Materials
- Roof Truss Calculator — How Many Trusses & Cost
- Siding Calculator — Squares, Panels, Boxes & Trim
Landscaping & Garden
Mulch, topsoil, raised-bed mixes, grass seed, sod, decks and fences.
- Pool Volume Calculator
- Mulch Calculator
- Topsoil & Raised-Bed Soil Calculator
Hardscaping & Paving
Pavers, patio bases, gravel and aggregate, asphalt driveways and retaining walls.
- Gravel, Sand & Aggregate Calculator
- Paver & Patio Calculator
- Asphalt Driveway & Paving Calculator
Earthworks & Excavation
Trench and pad volumes, cut and fill, soil swell, truckloads and cubic yards.
- Excavation & Trench Volume Calculator
- French Drain & Drainage Calculator
- Cubic Yards / Volume Calculator
Area & Conversions
Square footage, cubic yards, board feet, tank capacity and land-area units.
- Water Tank Capacity Calculator
- Land Area Unit Converter — Bigha, Katha, Gunta & Acre
- Square Footage Calculator — Area of Any Room or Shape
Electrical
Voltage drop, wire and cable sizing, and conductor selection for copper or aluminium.
- Voltage Drop & Wire Size Calculator
- Electrical Load & Service Size Calculator (NEC 2023)
- Wire Size Calculator — NEC Ampacity & Voltage Drop
Start here
The calculators most jobs begin with.
Bar Bending Schedule
Cut lengths, bend allowances and total rebar weight — instantly.
Paint Coverage & Cost Calculator
Paint, primer, the cheapest tins to buy and the cost — per room.
Tile & Flooring Calculator
Tiles, boxes to buy, grout and adhesive — with pattern waste built in.
Concrete Volume & Bag Calculator
Volume, bags to buy and the cost — slabs, footings, columns and stairs.
Roofing Calculator — Pitch, Area & Materials
Roof pitch, sloped area, shingles, metal or tile, accessories and cost.
Gravel, Sand & Aggregate Calculator
Order weight, volume, bags and cost for gravel, sand or topsoil — multiple zones, compaction and waste accounted for separately.
Paver & Patio Calculator
Pavers, base gravel, bedding sand and polymeric sand for a patio or walkway — with pattern waste, dig depth, cost and a live layout diagram.
Drywall & Plasterboard Calculator
How many sheets, plus joint compound, tape and screws for walls and ceilings — deduct openings, pick a sheet size, metric or imperial.
Excavation & Trench Volume Calculator
Cut volume, soil swell, spoil weight, truckloads and cost for pads, trenches and pier holes — multiple zones, metric or imperial.
Square Footage Calculator — Area of Any Room or Shape
Free square footage calculator: measure the area of rectangles, L-shaped rooms, circles and triangles — or enter a known area — then convert to m², yd², acres or hectares, add waste and price, all in your browser.
Every calculator, A–Z
The full catalog. Search by name, material or category.
A
B
- Bar Bending ScheduleSteel & Rebar
- Baseboard & Trim Calculator — Linear Feet, Sticks & CostDecorating & Interiors
- Blown-In Insulation CalculatorDecorating & Interiors
- Board Foot Calculator — Lumber, Volume & CostFraming & Carpentry
- Brick & Block CalculatorConcrete & Masonry
- BTU Calculator — AC Tonnage & Heater SizingDecorating & Interiors
C
- Carpet Calculator — Broadloom Yardage, Seams, Tiles & StairsDecorating & Interiors
- Concrete Mix Ratio CalculatorConcrete & Masonry
- Concrete Volume & Bag CalculatorConcrete & Masonry
- Conduit Fill CalculatorElectrical
- Countertop Calculator — Slabs, Area & CostDecorating & Interiors
- Cubic Yards / Volume CalculatorEarthworks & Excavation
- Cutting Length Calculator — Stirrups, Rings & Bent BarsSteel & Rebar
D
E
F
- Feet & Inches Calculator — Add, Subtract & ConvertFraming & Carpentry
- Fence Calculator — Posts, Rails, Pickets & ConcreteFraming & Carpentry
- Flooring Calculator — Laminate, Vinyl Plank & HardwoodDecorating & Interiors
- Framing / Stud Wall CalculatorFraming & Carpentry
- French Drain & Drainage CalculatorEarthworks & Excavation
G
I
L
M
P
R
- Rafter Length CalculatorFraming & Carpentry
- Raised Bed & Garden Soil CalculatorLandscaping & Garden
- Rebar Weight Calculator — kg/m & TonnageSteel & Rebar
- Retaining Wall Block Calculator — Blocks, Base, Drainage & CapsHardscaping & Paving
- Roof Pitch Calculator — Slope to Degrees, Percent & X-in-12Roofing & Siding
- Roof Snow Load Calculator — ASCE 7-16 Balanced Snow LoadRoofing & Siding
- Roof Truss Calculator — How Many Trusses & CostRoofing & Siding
- Roofing Calculator — Pitch, Area & MaterialsRoofing & Siding
S
- Siding Calculator — Squares, Panels, Boxes & TrimRoofing & Siding
- Slab Reinforcement CalculatorConcrete & Masonry
- Slope & Grade Calculator — Percent, Degrees, Ratio & FallEarthworks & Excavation
- Sod CalculatorLandscaping & Garden
- Sonotube & Pier Concrete CalculatorConcrete & Masonry
- Spray Foam CalculatorDecorating & Interiors
- Square Footage Calculator — Area of Any Room or ShapeArea & Conversions
- Stair CalculatorFraming & Carpentry
- Steel Quantity Estimator — Steel per m³ of ConcreteSteel & Rebar