All calculators
94 calculators across 13 trades, all in metric units.
Concrete & Masonry
Concrete Slab CalculatorVolume, bags and ready-mix for slabs, patios and basesStrip Footing CalculatorContinuous footings and foundation trenchesConcrete Pier & Pad CalculatorRound or square piers, columns and post padsConcrete Steps CalculatorPoured steps with a top landingConcrete Wall CalculatorPoured walls and foundation walls, minus openingsFence Post Concrete CalculatorCement, sand and stone per post holeRebar & Reinforcement CalculatorBars, laps, weight and ties for a slab gridReinforcing Mesh CalculatorRef mesh sheets with overlapsConcrete Block CalculatorBlocks and mortar for a block wallBrick CalculatorBricks and mortar by wall areaMortar CalculatorMortar for a known number of bricks or blocksBlock Paving CalculatorPavers, base, bedding sand, joint sand and edgingRetaining Wall Block CalculatorTerraforce and Löffelstein blocks, drainage stone and height checksCement, Sand & Stone CalculatorBags of cement and cubes of sand and stone for any amount of concreteFloor Slab CalculatorConcrete, DPM, mesh and fill for a ground floor slabStrip Foundation CalculatorTrenches, foundation concrete, bricks to DPC and mortar for a houseRoom Bricks & Mortar CalculatorBricks, cement and sand for all four walls of a roomBoundary Wall CalculatorBricks, piers, foundation and mortar for a free-standing wall
Carpentry & Framing
Roof Truss CalculatorTruss spacing, count and member sizesTimber Volume CalculatorCubic metres, linear metres and costSheet Material CalculatorOSB, plywood and board sheets for an areaSkirting & Architrave CalculatorLengths of trim for rooms, minus doorsCornice Mitre CalculatorMitre and bevel settings for any wall angleMitre Angle CalculatorCut angles for any corner or polygon
Roofing
Roof Tile & Slate CalculatorRoof area, tiles, battens, membrane and ridgeRoof Pitch CalculatorConvert rise/run, x/12, degrees and percentMetal Roof Sheet CalculatorIBR sheets, purlins, flashings and screwsGutter CalculatorGutter lengths, downpipes, brackets and fittingsRoof Truss & IBR Sheeting CalculatorTrusses, purlins, IBR sheets and screws for a gable roof
Walls & Finishes
Drywall Partition CalculatorRhinoBoard, studs, track and screws for a partitionPlastering & Rendering CalculatorCement and plaster sand for internal and external wallsCeiling Insulation CalculatorInsulation R-value for your SANS 10400-XA energy zoneBrandered Ceiling CalculatorRhinoBoard, branders and screws for a ceilingWallpaper CalculatorRolls needed with pattern repeatPaint CalculatorPaint for walls and ceilings, with coats and tin sizesExterior Paint CalculatorHouse walls and gables, with surface textureFibre-Cement Plank Cladding CalculatorNutec planks, battens, nails and corners
Flooring & Tile
Flooring CalculatorBoxes of laminate, vinyl plank or wood, plus underlayTile CalculatorFloor or wall tiles, boxes, adhesive and groutGrout CalculatorGrout weight by tile size and jointTile Adhesive CalculatorAdhesive bags by trowel notchCarpet CalculatorRoll length from roll width, pad, gripper and seamsFloor Screed CalculatorCement bags and sand for a sand-cement screedEpoxy Floor CalculatorCoating kits for garage and workshop floors
Decking & Fencing
Stairs, Ramps & Rails
Landscaping & Earthworks
Bark & Mulch CalculatorCubic metres of mulch or barkGravel CalculatorCubic metres and tonnes of stoneTopsoil CalculatorSoil for lawns, beds and levellingSand CalculatorSand by volume and weightInstant Lawn CalculatorInstant lawn by the square metreGrass Seed CalculatorSeed by grass type, for new lawns or overseedingLawn Fertiliser CalculatorProduct by application ratePlant Spacing CalculatorPlants for a bed at square or triangular spacingRaised Garden Bed Soil CalculatorSoil to fill raised bedsExcavation CalculatorDig volume, swell, spoil weight and skip loadsPool Volume CalculatorLitres in a pool or hot tubPond Liner CalculatorLiner and underlay size for a pond
Plumbing & Water
Pipe Volume CalculatorWater in a pipe run, and time to get hot waterDrain Fall CalculatorFall over a run, checked against SANS 10400-P drain loadsTank Volume CalculatorCylinder or rectangular tank, full or part-filledFlow Rate CalculatorBucket test to flow, and time to fillSeptic Tank & French Drain CalculatorTank size and french drain length to SANS 10400-PRainwater Tank CalculatorRainwater from your roof and the JoJo tank size to hold itGeyser Size CalculatorGeyser litres for a household, hot water energy and the 50% solar or heat pump ruleBorehole Pump & Tank CalculatorPump flow and head from your yield test, and the tank to store it
Electrical & Lighting
Voltage Drop CalculatorDrop for a cable run, and the smallest size that passesOhm’s Law & Watts CalculatorVolts, amps, ohms and watts from any twoElectricity Cost CalculatorRunning cost of an appliance or toolDownlight CalculatorHow many lights for a room, and spacingInverter & Battery CalculatorInverter rating and battery modules for load sheddingPlug Points & Surfix Cable CalculatorSurfix cable sizes and rolls for plug and light points
Aircon & Cooling
Measure & Convert
Square Metre CalculatorArea of rectangles, circles, triangles and L-shapesCubic Metre CalculatorVolume for boxes and cylinders, in every unitConstruction Unit ConverterLength, area, volume and weightRight Triangle & Diagonal CalculatorHypotenuse, angles and squaring a layoutSlope & Grade CalculatorPercent grade, degrees and drop over distanceCircle & Arc CalculatorCircumference, area, arc length and radius from chordMaterial Weight CalculatorTonnes from volume, and trailer checksEven Spacing CalculatorSpace posts, studs or balusters evenly with marks
Pricing & Business
Markup & Margin CalculatorPrice from cost, and the difference between markup and marginDay Rate & Hourly Rate CalculatorWhat to charge per hour and per day to hit your incomeJob Pricing CalculatorTurn costs into a bid with overhead, profit and taxVAT CalculatorAdd or remove VATTravel & Mileage Cost CalculatorWhat site travel really costs a jobCrew Hours CalculatorLabour hours and cost from start and finish timesPrice per Square Metre CalculatorCompare quotes or price by areaBuilding Cost CalculatorRough cost to build a house per m², from Stats SA figures