Free Home Improvement & Material Calculators

Free paint calculator: enter room size, doors and windows to get gallons (or litres) of paint and primer for walls, plus cans to buy for 1 or 2 coats.

How much paint for a bedroom, living room or bathroom? Enter wall sizes, coats and coverage to get gallons and cans, minus doors and windows.

Work out how much ceiling paint you need from room size and coats. Uses real coverage per gallon (or litre) and tells you how many cans to buy.

Estimate exterior house paint in gallons from wall square footage, siding type and coats. Subtract doors and windows and get the cans to buy.

Limewash paint calculator: enter room size, doors and windows to get the wall area, gallons (or litres) and cans of limewash for 1–2 coats.

Work out how many rolls of wallpaper you need, counting strips per wall and the pattern repeat. Works in inches or cm for US and European rolls.

Calculate drywall sheets for walls and ceilings: enter room size, choose 4x8, 4x10 or 4x12 sheets and get sheets, screws, tape and joint compound.

Measure your rooms and get the linear feet of baseboard trim and the number of 8, 12 or 16 ft pieces to buy, minus door openings, with waste for corners.

Room addition calculator: enter the new room to get drywall sheets, insulation, paint and flooring quantities for the space you are adding.

Dormer calculator: enter width, projection and wall height to get the floor area and the volume of a box dormer before you frame it.

Square metres to lineal metres: enter the area and the piece width to get the linear length and how many pieces to buy.

Square footage calculator: enter a rectangle, circle or L-shape to get square feet and square metres for flooring, paint or seed.

Stair calculator: enter the total rise to get the riser count, the tread depth and the stringer length for a straight flight.

Roofing calculator: enter the roof length and width to get the area, the underlayment and the squares of shingles to order.

Insulation calculator: enter the wall or attic area to get how many bags to buy from the coverage for the product you install.

Siding calculator: enter the wall perimeter and height to get the area and the panels or squares of siding to order.

Deck calculator: enter the deck size, board width and spacing to get the decking length, the joists and the posts.

Enter room size in feet or meters and box coverage to get the square footage and boxes of laminate to buy, including 10% waste and an underlayment tip.

Calculate how much luxury vinyl plank (LVP) flooring you need: square feet, boxes to buy and waste for straight or diagonal layouts, with optional cost.

Free tile calculator for floors, walls, showers and backsplashes. Enter area and tile size in inches or cm to get tiles and boxes to buy, with grout and waste.

Find how much carpet to order in square feet or square yards from room size and roll width (12 ft / 4 m), plus seams, waste and an optional cost estimate.

Free floor underlayment calculator for laminate and vinyl. Enter the room in feet and the roll size to get the square feet to cover and how many rolls to buy.

Floor screed and floor mud calculator: enter the floor size and depth to get the volume, bags and weight of sand-cement screed to buy, with waste.

Grout calculator: enter the tile size and the joint to get the litres of grout for the floor, then bags when you add a bag weight.

Thinset calculator: enter the floor area and the coverage for your trowel notch to get the bags of mortar to buy.

Hardwood flooring calculator: enter the room and the board coverage to get the square feet and the boards to order, with waste.

Calculate concrete for a slab or patio in cubic yards and 40, 60 or 80 lb bags (or m³ and kg bags). Includes waste, a size table and bags vs ready-mix.

How many bags of concrete per fence post? Enter hole diameter, depth and post size to get the concrete volume and 50 or 80 lb bags for each post and in total.

Calculate concrete for strip, square or round (deck) footings in cubic yards and bags. Enter footing size and count to get the total to order.

Find how many cinder blocks (8x8x16 CMU) you need for a wall or foundation, plus mortar bags and waste. Enter wall length and height in feet or meters.

Calculate bags of mortar mix for brick and concrete-block walls from wall area and joint size. Shows 60 or 80 lb bags (or 25 kg) with waste included.

Render coverage calculator: enter the wall size to get the area and the bags of base-coat render or stucco to order, including waste.

Concrete calculator: enter a slab, a column or steps to get cubic yards, cubic feet and 80 lb bags for the shape you are pouring.

Retaining wall calculator: enter the wall length and height to get blocks, cap pieces, base gravel and drain gravel.

Brick calculator: enter the wall size and the brick size to get the brick count and the mortar bags for that wall.

Enter bed size and depth to get mulch in cubic yards and 2 or 3 cu ft bags (or m³ and litres). Covers circles and tree rings, with a coverage chart.

Calculate how much topsoil you need in cubic yards, cubic feet or bags for a new lawn, sod base, garden bed or leveling. Enter area and depth in inches.

Work out gravel in tons, cubic yards or bags for a driveway, path or patio base. Pick the stone type (#57, pea gravel, crushed) for an accurate weight.

Calculate sand in tons, cubic yards or bags for paver bedding, a sandbox or leveling. Enter area and depth and get the amount to buy, waste included.

Enter lawn size to get square feet of sod, pieces (16x24 in) and pallets to order, or rolls in m². Includes waste for curves and an optional cost.

How much soil for a raised garden bed? Enter bed length, width and depth to get cubic feet, cubic yards or bags of soil mix, for one bed or several.

Paver calculator: enter the patio size and the paver size to get the paver count, base gravel and bedding sand for the area.

Fence calculator: enter the run, post spacing and picket size to get posts, rails, pickets and concrete for the holes.

Cost to paint a house: enter the room and your price per gallon to estimate paint and labor in US dollars. You supply the price.

Flooring cost calculator: enter the room and your price per square foot to estimate materials, underlayment and labor in US dollars.