Tiling calculators.Quantities, setting out, adhesives, grout, substrates, movement and pricing.

Areas

AreasWall tiling area less openings (up to four walls)

A_{g} = (L_{1} + L_{2} + L_{3} + L_{4}) H

AreasFloor tiling area (L-shaped room, less fixed units)

A = L W + L_{a} W_{a} - L_{o} W_{o}

Tile quantities

Tile quantitiesTiles per square metre including joint width

N = \frac{1000000}{(L + j) (W + j)}

Tile quantitiesTile count with waste for straight, brick bond, diagonal and herringbone

N_{0} = \frac{A \times 1000000}{(L + j) (W + j)}

Tile quantitiesBoxes of tiles to buy and cost

B = ⌈ \frac{A (1 + \frac{w}{100})}{C_{b}} ⌉

Tile quantitiesMosaic sheets needed

n = \frac{1000000}{(S_{1} + j) (S_{2} + j)}

Tile quantitiesStair tread and riser tiling area and nosings

A_{t} = \frac{n_{t} W_{s} G}{1000}

Layout geometry

Layout geometryDiagonal (45°) layout: tile diagonal and edge half-tiles

d = \sqrt{2} L

Layout geometryHexagon tile coverage (tiles per m² and order quantity)

s = \frac{F}{\sqrt{3}}

Adhesive and grout

Adhesive and groutGrout quantity (manufacturer formula, kg/m²)

q = \frac{L + W}{L \times W} T j K

Adhesive and groutTile adhesive from notched trowel coverage, with back-buttering

q = C_{n} + t_{b} C_{m}

Adhesive and groutSolid-bed adhesive from bed thickness (BS 5385 full coverage)

q = (t_{b} + t_{t}) C_{m}

Preparation

PreparationSelf-levelling compound quantity and bags

V = A d

PreparationPrimer quantity with dilution

M_{p} = A n c

PreparationTanking membrane, tape and corner pieces

M = A C_{m}

Finishing

FinishingTile trim lengths to buy

L_{t} = E_{1} + E_{2} + E_{3} + E_{4}

FinishingTile and stone sealer quantity

V = \frac{A n}{C_{s}}

Setting out

Setting outBalanced cuts from the centre line (equal cuts both ends)

S = \frac{L - n (t + j)}{2}

Setting outWhole tiles across and cut tile size on a run (from one end)

n = ⌊ \frac{L - 2 e}{t + j} ⌋

Setting outWall tile batten (datum) height and top cut

B = g + t + j

Floors and substrates

Floors and substratesTimber joist deflection check for a tiled floor

I = \frac{b d^{3}}{12}

Floors and substratesWeight of wall tiling against the background limit (BS 5385-1)

W_{tot} = W_{t} + W_{a}

Floors and substratesWet room and shower floor fall

h = \frac{1000 L_{r}}{N}

Movement joints

Movement jointsMovement joint layout for a floor: bays and joint lengths

n_{L} = ⌈ \frac{L}{S} ⌉, n_{W} = ⌈ \frac{W}{S} ⌉, increased until \frac{L}{n_{L}} \cdot \frac{W}{n_{W}} \leq A_{max}

Movement jointsThermal movement of a tiled field and minimum joint width

Δ L = α \times 10^{- 6} \times 1000 L Δ T

Screeds

ScreedsScreed drying time estimate (rule of thumb)

D = r_{1} \min (t, t_{b}) + r_{2} \max (t - t_{b}, 0)

ScreedsSand and cement screed: cement bags and tonnes of sand

V = \frac{A t}{1000}

Underfloor heating

Underfloor heatingThermal resistance of a tiled floor over underfloor heating

R = \frac{t_{t}}{1000 λ_{t}} + \frac{t_{a}}{1000 λ_{a}} + R_{x}

Slip resistance

Slip resistancePendulum test value (PTV) to coefficient of friction and slip potential

μ = \frac{3 PTV}{330 - PTV}

Setting out and cutting

Setting out and cuttingMitred external corner: bevel angle and bevel width

β = \frac{180 - A}{2}

Setting out and cuttingDiagonal (45°) tile layout: pitch and cuts

p = (a + j) \sqrt{2}

Pricing and business

Pricing and businessJob price: labour by area, materials markup and VAT

Net = A r + M (1 + \frac{m_{k}}{100}) + E

Pricing and businessDay rate to rate per m² and per hour

r_{m²} = \frac{D}{P}

Pricing and businessMarkup and margin from cost and selling price

profit = P - C

Pricing and businessLabour time estimate from area and daily output

days = \frac{A}{P} + X

Pricing and businessBusiness mileage at HMRC simplified rates

M = 2 d k

Pricing and businessVAT registration threshold check

head = thr - T

Large-format tiles

Large-format tilesLippage from tile bow in an offset (running bond) layout

δ = \frac{w_{p}}{100} L

Large-format tilesMinimum joint width by tile size (BS 5385-1/-3) and size variation (ANSI A108.02)

A = \frac{L W}{1000000}

Large-format tilesTile weight per m² and per tile from thickness and density

W_{m} = t ρ

Large-format tilesAdhesive contact coverage from a lift test

A_{t} = L W

Large-format tilesAdhesive bed thickness from data-sheet consumption

t_{r} = \frac{C}{c_{m}}

Large-format tilesTile levelling clips per m² and to buy

n = \frac{c_{L} + c_{W}}{\frac{L W}{1000000}}

Large-format tilesWall tiles above 3 m needing mechanical fixing (BS 5385-1:2018)

A_{t} = \frac{L W}{1000000}

Porcelain on pedestals

Porcelain on pedestalsPedestals needed for a terrace (corners shared)

n_{x} = ⌈ \frac{1000 a}{L + j_{w}} ⌉

Porcelain on pedestalsPedestal height across a falling deck

Δ h = 10 L_{r} (s_{d} - s_{p})

Porcelain on pedestalsLoad on each pedestal (imposed load plus paving weight)

g = \frac{t ρ \times 9.81}{1000}

External paving

External pavingBedding mortar for porcelain or stone paving (full bed)

V = A \frac{t_{b}}{1000} (1 + \frac{w}{100})

External pavingPaving jointing compound (resin or cementitious) quantity

J = \frac{L + W}{L W} j_{w} d ρ_{j}

Stone and sealing

Stone and sealingWater absorption of a tile or stone sample (porosity class)

M_{w} = m_{s} - m_{d}

Wetrooms

WetroomsShower drain capacity against shower flow

Q = \frac{n q + q_{b}}{60}

WetroomsDecoupling or waterproof sheet membrane rolls and seam tape

A_{e} = \frac{W_{r} - s_{o}}{1000} (L_{r} - \frac{e_{o}}{1000})

Tiling calculators.Quantities, setting out, adhesives, grout, substrates, movement and pricing.

Areas

Tile quantities

Layout geometry

Adhesive and grout

Preparation

Finishing

Setting out

Floors and substrates

Movement joints

Screeds

Underfloor heating

Slip resistance

Setting out and cutting

Pricing and business

Large-format tiles

Porcelain on pedestals

External paving

Stone and sealing

Wetrooms

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