🔨 Home Improvement & DIY Calculators

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Concrete Calculator

Work out how much concrete you need for a slab, patio, footing or post holes — in cubic yards, cubic metres and 40, 60 or 80 lb (or 20/25 kg) bags.

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Paint Calculator

Work out how much paint you need for a room in gallons or litres from the wall size, doors, windows, number of coats and coverage.

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Tile Calculator

Calculate how many floor or wall tiles you need from the area, tile size and grout gap, with a waste allowance and the number of boxes.

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Flooring Calculator

Work out how much laminate, vinyl plank, hardwood or carpet you need for one or more rooms, with waste allowance, boxes and cost.

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Mulch Calculator

Work out how much mulch or bark you need in cubic yards, cubic metres or 2 cu ft bags for any garden bed size and depth.

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Gravel Calculator

Calculate how much gravel, crushed stone or pea gravel you need for a driveway, path or patio — in tons, tonnes, cubic yards and cubic metres.

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Topsoil Calculator

Work out how much topsoil, compost or sand you need for a lawn, raised bed or garden in cubic yards, cubic metres, tonnes and bags.

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Board Feet

Calculate board feet for lumber and hardwood from thickness, width, length and number of boards, with total cost.

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Roofing Calculator

Estimate roof area, roofing squares, bundles of shingles and underlayment from the building size, overhang and roof pitch.

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Roof Pitch

Convert roof rise and run into pitch (x/12), angle in degrees and slope %, and work out the rafter length and ridge height from the span.

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Wallpaper Calculator

Work out how many rolls of wallpaper you need from the wall length, height, roll size and pattern repeat.

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Stair Calculator

Work out the number of steps, riser height, tread depth, total run, stringer length and angle for a staircase, with a building-code check.

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Heat Pump vs Gas

Compare the yearly running cost of an air source heat pump with a gas boiler from your gas use, prices, boiler efficiency and the heat pump's SCOP.

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Energy Bill

Work out your electricity or gas bill from kWh used, unit rate, daily standing charge, days and VAT or tax — and the yearly cost.

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Pool Volume

Calculate how many gallons or litres your swimming pool holds — rectangular, round or oval, with shallow and deep ends — plus fill time and pump size.

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Square Footage

Calculate square footage for rooms, houses, lawns or land from length and width in feet, inches, yards or metres — add several areas and estimate cost.

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Cubic Yards

Convert length, width and depth into cubic yards, cubic feet and cubic metres for soil, mulch, gravel, concrete or fill dirt — with cost.