Construction calculators

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Guide, tables and sources

How many tiles, bags of thinset, pounds of grout and gallons of paint? Type the room size once and get a shopping list in the units and package sizes sold where you live.

Everything for one room

Floor tile, thinset, grout and baseboard for a room, in one go. Open any line for the detailed calculator.

All calculators

Tile calculator Tiles and boxes for any floor, with waste for each layout pattern. Tile layout calculator See every tile and cut in your room and find the starting point that avoids thin slivers. Thinset calculator Bags of thinset (tile adhesive) for your floor or wall, by trowel size. Grout calculator Pounds or kilograms of grout from tile size, joint width and tile thickness. Porcelain tile calculator Large-format porcelain: tiles, boxes and waste for 24 × 24, 24 × 48 and more. Wall tile calculator Tiles for bathroom walls, showers and backsplashes, minus doors and windows. Screed calculator Cement and sand, or bags of ready-mix, for a floor screed or mortar bed. Paint calculator Gallons or liters of paint for walls and ceiling, minus doors and windows. Joint compound calculator How much joint compound to skim coat walls and ceilings. Wall texture calculator Pounds or kilograms of texture for walls and ceilings, from fine to coarse. Baseboard calculator Linear feet of baseboard minus doorways, and the number of pieces. Vinyl plank flooring calculator Boxes of luxury vinyl plank (LVP) with waste for each layout. Laminate flooring calculator Boxes of laminate flooring and underlayment for any room. Square footage calculator Area of a room in square feet and square meters, including L-shapes.

Made for the store aisle

Each calculator rounds up to whole tiles, boxes, bags and cans, and shows the waste allowance it adds, so you buy once and don't run out halfway through the job.

Switch between US units (feet, pounds, gallons) and metric (meters, kilograms, liters) at any time. Japanese tsubo and jo and Korean pyeong are supported too.

Where the numbers come from

Consumption figures come from manufacturer data sheets, such as Laticrete and Custom Building Products for thinset, Mapei's grout formula and paint coverage published by Benjamin Moore and Dulux. Every calculator lists its sources, and every number can be changed to match the product you buy.

Where the numbers come from

Coverage and consumption figures come from manufacturer data sheets and published standards:

Frequently asked questions

How do I calculate how much tile I need?

Multiply the room's length by its width to get the floor area, add 10% for cuts and breakage (15% for diagonal layouts) and divide by the area of one tile. The tile calculator does this and also counts boxes.

How much paint do I need for a room?

A 12 × 12 ft room with 8 ft ceilings has about 350 sq ft of wall after subtracting a door and a window. Two coats at 400 sq ft per gallon need about 2 gallons. The paint calculator works it out for any room.

Do the calculators work in square meters?

Yes. Every calculator has a switch between US units and metric, and you can type feet and inches like 12'6".

Do I need to sign up or install anything?

No. The calculators run in your browser, work offline after the first visit and don't send your data anywhere.