Worked examples
Every figure computed
One job, one calculator, every step
A room, a slab, a roof: each job with the exact inputs, the calculator’s own working step by step, the answer in both unit systems, what to buy, and what moves the answer when the job changes. The same search the bare calculator answers, with the working shown.
- 24Jobs worked
- 20Calculators
- 12Trades

2 jobs
Groundwork
A single-car gravel driveway, in tons and yards
US · imperial firstGravel for a single-car driveway 60 by 10 ft
Gravel Calculator: 12 US short tons
See every step →A water service trench, in loose backfill
US · imperial firstBackfill for a 60 ft water service trench from the street to the house
Trench Excavation & Backfill Volume Calculator: 11.7 yd³
See every step →
4 jobs
Concrete
A garden shed base, in cubic metres
UK · metric firstConcrete for a garden shed base 3.6 by 2.4 m, 10 cm deep
Concrete Calculator: 0.9504 m³
See every step →A rectangular slab, in cubic yards
US · imperial firstConcrete for a 20 by 30 ft slab, 4 in thick
Concrete Calculator: 8.148 yd³
See every step →A garage base, in sheets of steel mesh
UK · metric firstWelded steel mesh for a 6 by 4 m single garage base
Welded Wire Mesh Calculator — Reinforcing Mesh Sheets for a Slab: 3 sheets
See every step →A garage slab's grid, in stock lengths of bar
US · imperial firstRebar for a 24 by 24 ft garage slab on a square grid
Rebar Calculator: 47 x 20 ft sticks
See every step →
2 jobs
Masonry
An extension's flank wall, in facing bricks
UK · metric firstFacing bricks for the flank wall of a single-storey extension, 6.5 by 2.6 m
Brick Calculator: 1,052 bricks
See every step →A batch of Type N mortar, in cement, lime and sand
US · imperial firstCement, lime and sand for 20 ft³ of site-mixed Type N mortar
Mortar Mix Calculator (ASTM C270 Types M, S, N, O): 22 ft³
See every step →
2 jobs
Carpentry
An exterior wall's plates and headers, in lineal feet
US · imperial firstPlates, headers and the extra studs of a 24 ft exterior wall with two windows and a door
Wall Plates, Headers and Cripples Calculator (Sole Plate, Head Binder, Lintel and Corner Studs): 121.4 ft
See every step →A straight partition wall, in studs
US · imperial firstStuds for a 20 ft interior basement wall with one door
Framing Stud Calculator: 20 studs
See every step →
4 jobs
Roofing
An L-shaped hip and valley roof, measured
US · imperial firstThe roof area and edge lengths of an L-shaped house with a hipped main roof and a gabled wing
L-Shaped and T-Shaped Roof Calculator (Area, Ridges, Hips, Valleys, Eaves and Rakes): 1,771 sq ft
See every step →A semi's roof re-covered, in tiles and battens
UK · metric firstConcrete interlocking roof tiles for re-covering a 81 m² two-slope roof
Roof Tile and Slate Calculator (Gauge, Battens and Ridge Tiles): 836 tiles
See every step →A low-pitch garage roof, in squares and bundles
US · imperial firstShingles for a detached garage roof 24 by 24 ft on plan, at a 4/12 pitch
Roofing Shingle Calculator: 6.679 squares
See every step →A gable roof, in squares and bundles
US · imperial firstShingles for a gable roof 34 by 26 ft on plan, at a 6/12 pitch
Roofing Shingle Calculator: 11.07 squares
See every step →
1 job
Insulation
A semi's cavity walls, in bales and holes
UK · metric firstBlown cavity wall insulation for the gable end and rear wall of a semi-detached house
Cavity Wall & Stud Bay Insulation Fill Calculator: 7 bags
See every step →
2 jobs
Drywall
A rectangular room's walls, in sheets
US · imperial firstDrywall for the walls of a 12 by 10 ft room with 8 ft walls
Drywall Calculator: 11 sheets (4x8 ft)
See every step →A bedroom reboarded, in plasterboard sheets
UK · metric firstPlasterboard for the walls of a 4.2 by 3.3 m bedroom
Drywall Calculator: 13 sheets (2400x1200 mm)
See every step →
1 job
Plastering
A living room skimmed, in bags of finish plaster
UK · metric firstFinish plaster to skim 42 m² of living room walls
Skim Coat Plaster Calculator: 120.7 kg
See every step →
2 jobs
Tiling
A small bathroom floor, in tiles and boxes
US · imperial firstFloor tile for a 40 sq ft bathroom in a plank tile laid in an offset bond
Floor & Wall Tile Calculator: 23 tiles
See every step →A tiled bathroom wall, in kilograms of grout
UK · metric firstGrout for 8.5 m² of bathroom wall tiled in 600 mm by 300 mm porcelain
Grout Calculator: 1.336 kg
See every step →
2 jobs
Painting and decorating
A bedroom's walls, in litres of paint
UK · metric firstPaint for the walls of a 4 by 3.5 m bedroom, 2 coats
Paint Calculator: 6.246 L
See every step →A living room repainted, in gallons
US · imperial firstPaint for the walls of an 18 by 14 ft living room with 9 ft walls
Paint Calculator: 2.794 gal
See every step →
1 job
Fencing and decking
A backyard deck, in deck boards
US · imperial firstDeck boards for a 16 by 12 ft deck off the back of a house
Deck Board Calculator: 26 boards
See every step →
1 job
Paving and surfacing
An asphalt core, in percent of maximum density
US · imperial firstIn-place density of an asphalt core taken from an under-rolled edge of a new mat
Asphalt In-Place Density (Percent of Gmm) Calculator: 89.93 %
See every step →
Looking for a whole job?
These pages run one calculator. For a bathroom, a deck or a driveway taken off from the first measurement, with every calculator in the order the work is done, see the whole-job worked examples.