Home/Calculators

All calculators

88 calculators across 13 trades, all in UK metric units. Switch at the top right.

Concrete & Masonry

Concrete Slab CalculatorVolume, bags and ready-mix for slabs, patios and bases Strip Footing CalculatorContinuous footings and foundation trenches Concrete Pier & Pad CalculatorRound or square piers, columns and post pads Concrete Steps CalculatorPoured steps with a top landing Concrete Wall CalculatorPoured walls and foundation walls, minus openings Fence Post Concrete CalculatorBags per post hole, with gravel base Rebar & Reinforcement CalculatorBars, laps, weight and ties for a slab grid Steel Mesh CalculatorSheets of slab mesh with overlaps Concrete Block CalculatorBlocks and mortar for a block wall Brick CalculatorBricks and mortar by wall area Mortar CalculatorMortar for a known number of bricks or blocks Block Paving CalculatorPavers, base, bedding sand, joint sand and edging Retaining Wall Block CalculatorBlocks, caps, base and drainage stone

Carpentry & Framing

Stud Wall CalculatorStuds, plates and sheathing for a framed wall Floor Joist CalculatorJoist count, rim, hangers, blocking and subfloor Rafter Length CalculatorRafter length, rise, cut angles and count Timber Volume CalculatorCubic metres, linear metres and cost Sheet Material CalculatorOSB, plywood and board sheets for an area Skirting & Architrave CalculatorLengths of trim for rooms, minus doors Coving & Crown Mitre CalculatorMiter and bevel settings for any wall angle Mitre Angle CalculatorCut angles for any corner or polygon

Roofing

Roof Tile & Slate CalculatorRoof area, tiles, battens, membrane and ridge Roof Pitch CalculatorConvert rise/run, x/12, degrees and percent Metal Roof Sheet CalculatorPanels, trim, closures and screws Gutter CalculatorGutter lengths, downspouts, hangers and fittings Roof Ventilation CalculatorEaves and high-level vent requirements

Walls & Finishes

Plasterboard CalculatorBoards, screws, scrim and skim for a room Plastering & Rendering CalculatorSkim, bonding, hardwall and render Loft Insulation CalculatorRolls to reach 270 mm, with U-value Suspended Ceiling CalculatorTiles, mains, cross tees, wall angle and wires Wallpaper CalculatorRolls needed with pattern repeat Paint CalculatorPaint for walls and ceilings, with coats and tin sizes Exterior Paint CalculatorHouse walls and gables, with surface texture Cladding CalculatorCladding boards, battens and fixings

Flooring & Tile

Flooring CalculatorBoxes of laminate, vinyl plank or wood, plus underlay Tile CalculatorFloor or wall tiles, boxes, adhesive and grout Grout CalculatorGrout weight by tile size and joint Tile Adhesive CalculatorAdhesive bags by trowel notch Carpet CalculatorRoll length from roll width, pad, gripper and seams Floor Screed & Leveller CalculatorSelf-leveller bags or sand-cement screed Epoxy Floor CalculatorCoating kits for garage and shop floors

Decking & Fencing

Deck Board CalculatorBoards, screws or clips for a deck surface Deck Framing CalculatorJoists, beams, posts, footings and hardware Deck Stain CalculatorStain or oil for deck, rails and steps Fence CalculatorPanels, posts, gravel boards and concrete Chain Link Fencing CalculatorFabric, posts, rail and fittings

Stairs, Ramps & Rails

Stair CalculatorRisers, treads, stringer length and code checks Access Ramp CalculatorRamp length, landings and slope check Spindle Spacing CalculatorEven spacing under the 4" or 100 mm rule

Landscaping & Earthworks

Bark & Mulch CalculatorCubic metres and bags of bark Gravel CalculatorTonnes and bulk bags of gravel Topsoil CalculatorSoil for lawns, beds and levelling Sand CalculatorSand by volume and weight Turf CalculatorRolls of turf and pallets Grass Seed CalculatorSeed by grass type, for new lawns or overseeding Lawn Feed CalculatorProduct by application rate Plant Spacing CalculatorPlants for a bed at square or triangular spacing Raised Garden Bed Soil CalculatorSoil to fill raised beds Excavation CalculatorDig volume, swell, spoil weight and truck loads Pool Volume CalculatorLitres in a pool or hot tub Pond Liner CalculatorLiner and underlay size for a pond

Plumbing & Water

Pipe Volume CalculatorWater in a pipe run, and time to get hot water Drain Fall CalculatorTotal fall at 1:40, 1:80 and more Tank Volume CalculatorCylinder or rectangular tank, full or part-filled Flow Rate CalculatorBucket test to flow, and time to fill

Electrical & Lighting

Voltage Drop CalculatorDrop for a cable run, and the smallest size that passes Ohm’s Law & Watts CalculatorVolts, amps, ohms and watts from any two Electricity Cost CalculatorRunning cost of an appliance or tool Downlight CalculatorHow many lights for a room, and spacing

Heating, Cooling & Air

BTU & Radiator CalculatorHeat output needed for a room Extractor Fan CalculatorExtract rates in litres per second

Measure & Convert

Square Metre CalculatorArea of rectangles, circles, triangles and L-shapes Cubic Metre CalculatorVolume for boxes and cylinders, in every unit Construction Unit ConverterLength, area, volume and weight Feet and Inches CalculatorAdd, subtract, multiply and divide tape measurements Inch Fraction CalculatorDecimals, fractions and millimetres Right Triangle & Diagonal CalculatorHypotenuse, angles and squaring a layout Slope & Grade CalculatorPercent grade, degrees and drop over distance Circle & Arc CalculatorCircumference, area, arc length and radius from chord Material Weight CalculatorTons or tonnes from volume, and trailer checks Even Spacing CalculatorSpace posts, studs or balusters evenly with marks

Pricing & Business

Markup & Margin CalculatorPrice from cost, and the difference between markup and margin Day Rate & Hourly Rate CalculatorWhat to charge per hour and per day to hit your income Job Pricing CalculatorTurn costs into a bid with overhead, profit and tax VAT CalculatorAdd or remove VAT Travel & Mileage Cost CalculatorWhat site travel really costs a job Crew Hours CalculatorLabour hours and cost from start and finish times Price per Square Metre CalculatorCompare quotes or price by area