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Bricklaying calculators. 42 tools for brickwork, blockwork and mortar.

Quantities

QuantitiesWall area less openingsAgross=lhQuantitiesRectangular wall + triangular gableA=bh+br2−AoQuantitiesRaking wall / trapezoidA=l(h1+h2)2−AoQuantitiesSolid volumeV=LHT1000QuantitiesFacing brick quantityNm²=1 000 000(l+jp)(h+jb)QuantitiesBlock quantityNm²=1 000 000(l+jp)(h+jb)QuantitiesTwo-leaf / cavity-wall quantitiesQi=⌈AiNi(1+w100)⌉QuantitiesPaving units & beddingN=⌈A×1 000 000(L+j)(W+j)(1+w100)⌉QuantitiesWall-tie allowanceNfield=⌈Aρ⌉QuantitiesDPC / membrane roll allowanceL=r+nl1000QuantitiesConcrete / trench quantityVnet=lbdQuantitiesExcavation & loose spoilVin situ=LWD

Geometry

GeometryRectangle area & perimeterA=LWGeometryTriangle areaA=bh2GeometryCircle area & circumferenceA=πd24GeometryRise, run, slope & rakeL=x2+y2

Setting out

Setting outCourse gauge & heightg=h+jbSetting outCourses within a target heightn=⌊Hg⌋Setting outBed joint needed for a targetjb=H−nhnbSetting outBrickwork CO− / CO / CO+CO=n(l+j)Setting outFit units between two endsj=S−nlnjSetting outStretcher offset / bond modulem=l+jSetting outSquare a rectangular set-outD=L2+W2Setting out3–4–5 setting-out trianglea=3k, b=4k, c=5kSetting outFall from a 1:n gradientf=xn×1000Setting outLevel-book calculationHI=RLknown+BSSetting outDrawing scaleR=D×nSetting outLintel overall lengthLlintel=W+bL+bR

Arches & curves

Arches & curvesSegmental arch geometryR=S28h+h2Arches & curvesArc length & chorda=Rθ×π180Arches & curvesCurved wall / ring volumeA=π[(R+t1000)2−R2]×φ360

Mortar

MortarMortar volume: geometric estimateN=A×1 000 000(L+jv)(H+jh)MortarBagged mortar from declared yieldB=⌈V(1+w100)Y⌉MortarPrescribed mortar: gauging volumesp=Vc+l+sMortarProduct water / admixture doseD=BdMortarRepointing volumef=1−LH(L+jv)(H+jh)

Site maths

Site mathsMaterial mass & self-weightm=VρSite mathsAverage bearing pressurep=FASite mathsPacks, units & wasteT=⌈N(1+w100)⌉Site mathsJob estimate & VATB=qc+dr+oSite mathsLabour durationDw=UrSite mathsLength, area & volume conversionsm=mm1000