Harth / Free tools
Materials & quantities
Thirteen quantity calculators for early estimates and material orders: concrete volume and premix bags, brick and block counts, tile layouts and boxes, plasterboard or drywall sheets, paint litres or gallons and tins, decking board rows and stock lengths, fence posts, rails and panels, excavation and fill volume with mass, steel and rebar weight, insulation packs, lumber in board feet, wall studs and plates, and screw and fastener boxes.
13 materials & quantities tools
Free export on every toolConcrete quantity calculator
Estimate slabs, walls, footings and columns, including waste and premix bags.
Interactive tool · Free exportBrick & block quantity calculator
Estimate masonry units from wall area, openings, joints and waste.
Interactive tool · Free exportTile quantity & layout calculator
Compare an area allowance with a rectangular tile layout and box count.
Interactive tool · Free exportPlasterboard / drywall sheet calculator
Compare sheet orientations and an area estimate for a rectangular wall.
Interactive tool · Free exportPaint quantity calculator
Calculate paint for walls and optional ceilings, including coats and tin sizes.
Interactive tool · Free exportDecking board calculator
Calculate board rows, linear metres and a conservative stock-length order.
Interactive tool · Free exportFence material calculator
Build a material list for separate fence runs, panels or palings and gates.
Interactive tool · Free exportExcavation & bulk materials
Estimate excavation or fill volume and material mass with explicit allowances.
Interactive tool · Free exportSteel & rebar weight calculator
Calculate weights for round bars, plates, hollow sections and entered section masses.
Interactive tool · Free exportInsulation quantity calculator
Calculate coverage and packs for batts or rolls with your waste allowance.
Interactive tool · Free exportBoard foot & lumber calculator
Total board feet, cubic metres and linear feet for a lumber list, on nominal or actual sizes, with waste and cost.
Interactive tool · Free exportWall framing & stud calculator
Count studs, king and jack studs, cripples, headers and plates for one or more framed walls, with corners and openings.
Interactive tool · Free exportScrew & fastener quantity calculator
Estimate deck screws, sheathing nails or drywall screws and boxes from area, framing spacing and fastener spacing.
Interactive tool · Free exportAbout the materials & quantities tools
Each one works from the dimensions you enter, adds the waste allowance you set, and shows the formula it used. Where a product size matters, such as bag yield, sheet size, tile size, board width or pack coverage, the value is an editable example rather than a specification, so you can substitute the figures from your supplier. Schedules accept up to 200 rows for projects with many rooms or runs.
Imperial is the default, with cubic yards, square feet, pounds and US gallons, and a metric switch converts every dimensional field and result. Results export as PDF or CSV with the inputs and assumptions recorded, and inputs can be saved as a local JSON file.
These are quantity estimates, not designs. They do not size structure, check code requirements or price materials, and the notes on each page explain what a detailed cutting plan or a supplier take-off would add.
Start with: Concrete quantity calculator, Tile quantity & layout calculator, Paint quantity calculator.
Popular questions
How many cubic yards is a 10x10 slab 4 inches thick?
A 10 × 10 ft slab at 4 in thick is 33.3 ft³, which is 1.23 cubic yards. With a 10% waste allowance, order about 1.36 cubic yards.
From the Concrete quantity calculator
How many bricks per square foot?
Modular brick with 3/8 in mortar joints needs 6.75 bricks per square foot, or 675 per 100 square feet of single-wythe wall.
From the Brick & block quantity calculator
How many 12x24 tiles do I need for 100 square feet?
You need 50 tiles of 12 × 24 in to cover 100 square feet, since each covers 2 square feet. With a 10% waste allowance, buy 55.
From the Tile quantity & layout calculator
How many sheets of drywall do I need for a 12x12 room?
A 12 × 12 ft room with 8 ft walls has 384 square feet of wall and a 144 square foot ceiling, 528 square feet in total. That is 11 sheets of 4 × 12, which fit exactly, or 17 sheets of 4 × 8 by area and 18 on a grid, before waste. Order 12 to 13 sheets of 4 × 12 or about 20 of 4 × 8 with a 10% allowance.
How much paint do I need for a 12x12 room?
The walls of a 12 × 12 ft room with 8 ft ceilings are 384 square feet. Two coats at 350 square feet per gallon need 2.19 gallons, or 2.41 with a 10% allowance, so buy three gallons. Adding the ceiling brings it to 3.32 gallons, or four cans.
From the Paint quantity calculator
Other free tool categories
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