Home & Life

Construction & DIY Calculators

Paint, flooring, concrete, lumber, drywall, insulation, roofing and more. Free calculators with formulas and worked examples.

Lumber and wood

Board Foot Calculator (Lumber Volume and Cost)Enter board size and quantity to get board feet and the cost.

Walls and ceilings

Drywall Mud, Tape and Screws CalculatorEnter the area to board and get sheets, mud, tape and screws.Insulation Calculator (R-Value, Thickness and Bags)Enter area and target R-value to get thickness and quantity.Drywall Calculator (Sheets of Plasterboard)Enter the room size, ceiling height and openings.

Outdoor

Fence Post and Concrete CalculatorEnter fence length and post size to get posts and bags of concrete.Deck Stain Calculator (Gallons by Wood Type)Enter deck area and wood type to get gallons of stain to buy.Sod Calculator (Rolls and Pallets for Irregular Yards)Break your yard into rectangles and a triangle to get sod rolls and pallets.Paver Base Calculator (Gravel, Sand and Pavers)Enter area and base depth to get gravel, sand and paver quantities.

Roofing

Roof Pitch Calculator (Pitch, Angle and Roof Area)Enter pitch and building size to get angle, rafter length and roof area.Gutter and Downspout Calculator (Rain Runoff)Enter roof area and rainfall to size gutter downspouts.

Masonry

Brick and Mortar Calculator (Wall Bricks and Mortar Bags)Enter wall size and brick size to get bricks and mortar.

Heating and cooling

HVAC Tonnage Calculator (AC Size by Room Area)Enter area and climate to estimate cooling BTU and AC tons.

Pools

Pool Chlorine Calculator (How Much to Add)Enter the pool volume, current and target chlorine, and the product's strength.Pool Salt Calculator (Salt Water Chlorinator)Enter the pool volume, the current salt reading and the target from your chlorinator manual.

Building and DIY

Room Area CalculatorMeasure a room once and get square feet, square meters and perimeter.Paint CalculatorBuy the right amount of paint the first time.Flooring CalculatorSquare footage, waste allowance and boxes in one step.Tile CalculatorCount tiles including grout lines and cutting waste.Concrete CalculatorSize a pour and see how many bags you need.Gravel CalculatorOrder the right amount of stone by volume and weight.Roofing CalculatorConvert footprint and pitch into shingles.Wallpaper CalculatorRolls needed for a room or feature wall, with pattern waste.Fence CalculatorA materials list for a picket or privacy fence.Stair CalculatorPlan stairs that are comfortable and code-friendly.

Garden

Mulch CalculatorCover your beds to the right depth without over-buying.Pool Volume CalculatorKnow your pool's volume for chemicals and filling costs.

Framing

Wall Stud Calculator (Studs and Plates)Enter the wall length, stud spacing and the number of corners and openings.Plywood and OSB Sheet CalculatorEnter the area to cover and the sheet details.

Landscaping

Retaining Wall Block CalculatorEnter the wall size and the block size.

Decks and railings

Baluster Spacing Calculator (4-Inch Rule)Enter the distance between posts, the baluster width and the maximum gap.Deck Boards Calculator (Boards, Joists and Screws)Enter the deck size, board size and joist spacing.

Concrete and masonry

Rebar Calculator (Slab Grid)Enter the slab size, bar spacing and edge cover.Concrete Block Calculator (CMU Wall)Enter the wall size and any openings.

Paving

Asphalt Calculator (Tons for a Driveway)Enter the area, thickness and price per ton.

Flooring and tiling

Tile Grout Calculator (kg or lb Needed)Enter the tile size, joint width and depth, and the area.Epoxy Resin Calculator (Volume for Floors, Tables and Coatings)Enter the area, thickness and the resin-to-hardener mix ratio.

Plumbing

Pipe Volume Calculator (Water in a Pipe)Enter the pipe's inside diameter and length.

About these calculators

Work out how much material a job needs before you buy: coverage, volumes, counts and costs, with a waste allowance. Always check manufacturer coverage rates and local building codes before you buy or build.

Each calculator explains its formula, includes a worked example and lists its sources. Read how we check them on our editorial policy page, or browse all calculators.

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Please note: TheCalcTools gives general estimates for information and education. It is not financial, medical, legal or tax advice, and results should be checked before you make a decision. See our disclaimer and about page.