Home & DIY

How much material a job needs, with a margin for cuts and waste, and what it will cost: tiles, flooring, concrete, wallpaper, bricks, stairs and more.

All tools

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Air Conditioner BTU Calculator Estimate the cooling capacity your room needs in BTU per hour and kilowatts, with corrections for sun, people and a kitchen, and the nearest standard unit size. Appliance Electricity Cost List your appliances with their watts and hours a day to see the kWh a day, month and year and what they cost on your bill, appliance by appliance. Board Foot Calculator Work out the board feet and the cubic metres of lumber from the thickness, width, length and number of pieces, in inches and feet or in millimetres and metres. Brick Calculator Work out how many bricks or aerated blocks a wall needs, after the openings, with the joints and waste, plus the cubic metres of mortar for the wall. Concrete Calculator Work out the concrete volume for a slab, footing, round column, wall or stair, with waste, the truck loads and the number of dry-mix bags you need. Curtain Size Calculator Work out the fabric width, number of fabric widths, cut drop and metres of fabric for curtains on a window, with rod pocket, eyelet or pleated heading. Deck Board Calculator Count the deck boards for a deck: the rows across the width with the gap between boards, the boards per row from the length, and the boards to order with waste. Drywall Sheet Calculator Count the drywall or plasterboard sheets for a room's walls and ceiling, less the doors and windows, with the waste added and the area of one sheet shown. Fence Calculator Count the fence panels, posts and rails for a straight run, with the gates taken out of the length, so you know what to buy before you start digging. Flooring Calculator Work out the laminate or wood flooring packs for several rooms, with waste for a straight or diagonal lay, plus the underlay and the skirting you need. Gravel and Sand Calculator Work out the volume and the weight in tonnes of gravel, sand, soil or mulch for an area and depth, with the number of 25 kg bags and the cost. Insulation Thickness Calculator Work out the U-value of a wall or roof from its layers, and the thickness of insulation to add to reach your target U-value, with the surface resistances. Paver and Base Calculator Work out how many paving blocks a patio or path needs, with the joints and waste, and the volume of the compacted base under them in cubic metres or yards. Pool Volume Calculator Estimate the water volume of a rectangular pool with a sloped floor, or a round pool, in cubic metres and litres, from its size and depth. Roof Pitch Calculator Convert a roof pitch between rise and run, angle and percent, get the x:12 ratio, the rafter length with overhang and the roof area of a gable roof. Soil Volume Calculator Work out the soil, mulch or sand for your garden beds in cubic metres, litres and bags, for rectangular and round beds, laid to any depth. Solar Panel Calculator Find how many solar panels and what system size your yearly electricity use needs, the energy they give, and whether your roof has room for them. Stair Calculator Work out the number of risers, riser height and tread depth for a flight, checked by the comfort rule 2 × riser + tread, with angle and stringer length. Tank Volume Calculator Work out the litres in a vertical, horizontal or box tank at any liquid depth, with its full capacity and the percentage filled. Tile Calculator Work out the floor or wall tiles, boxes, kilograms of adhesive and grout for several rooms, with waste for straight, diagonal or herringbone laying. Wallpaper Calculator Work out how many rolls of wallpaper a room needs, allowing for doors, windows, the trimming and a straight or half-drop pattern repeat. Each step is shown.

Check the coverage and pack sizes on the product you buy; they vary by brand.