41 free calculators
Work out how much you need.
Concrete, gravel, asphalt, soil, stairs and roofing, measured in the units suppliers actually sell in. Every formula is shown, every constant is published, and nothing asks you to sign up.
Most used
Concrete Calculator
This concrete calculator estimates the volume and weight needed for slabs, footings,…
Square Footage Calculator
This square footage calculator measures a room, an irregular space or a…
Gravel Calculator
Use this gravel calculator to work out how much a driveway, path…
Asphalt Calculator
This asphalt calculator works out how many tons a driveway, parking lot…
Cubic Yard Calculator
The cubic yard calculator below turns any space into cubic yards, plus…
Stair Calculator
Use this stair calculator to work out riser height, tread depth, total…
Mulch Calculator
This mulch calculator works out how much a bed needs, in cubic…
Roof Pitch Calculator
This roof pitch calculator converts pitch to angle and slope, sizes rafters…
The formula is on the page
Every calculator shows the arithmetic it used and a worked example, so you can check the answer rather than trust it.
Constants are published
Densities, coverage rates and code limits are printed alongside the result, with a note wherever sources genuinely disagree.
Units suppliers use
Cubic yards, tons, bags and pallets, whichever way the yard sells it, with exact volume separated from estimated weight.
All calculators
Grouped by what you are estimating.
Concrete & Masonry
8 calculators
Concrete Calculator
This concrete calculator estimates the volume and weight needed for slabs, footings, columns, tubes, curbs and…
Concrete Cost Calculator
This concrete cost calculator prices a pour from its dimensions: ready-mix by the cubic yard, delivery…
Concrete Block Calculator
This concrete block calculator works out how many blocks a wall needs, the mortar that goes…
Brick Calculator
Use this brick calculator to work out how many bricks a wall or patio needs, how…
Mortar Calculator
Use this mortar calculator to work out how much a brick or block job needs, as…
Sonotube Calculator
This sonotube calculator works out how much concrete a form holds, how many bags that is,…
Stucco Calculator
This stucco calculator gives bags per coat, the lath and paper underneath, and the sand and…
Rebar Calculator
Use this rebar calculator to work out how many lengths a slab grid or footing needs,…
Landscaping
10 calculators
Gravel Calculator
Use this gravel calculator to work out how much a driveway, path or bed needs, in…
Pea Gravel Calculator
This pea gravel calculator works out how much a path, patio, playground or dog run needs,…
River Rock Calculator
This river rock calculator works out how much a bed, border or dry creek needs, in…
Limestone Calculator
The limestone calculator below gives the tons and cubic yards an area needs by gradation, from…
Mulch Calculator
This mulch calculator works out how much a bed needs, in cubic yards for bulk delivery…
Rubber Mulch Calculator
The rubber mulch calculator below works out how many bags a bed or play area needs,…
Topsoil Calculator
This topsoil calculator works out how much a lawn, garden bed or raised bed needs, in…
Sand Calculator
Use this sand calculator to work out how much you need for a paver base, a…
Sod Calculator
This sod calculator works out how much a lawn needs, in square feet, pieces and pallets,…
Paver Base Calculator
This paver base calculator gives the gravel base and bedding sand a patio, walkway or driveway…
Roofing & Rainwater
5 calculators
Roof Pitch Calculator
This roof pitch calculator converts pitch to angle and slope, sizes rafters from a span, and…
Rafter Calculator
This rafter calculator gives common rafter length with the ridge and birdsmouth deductions, how many a…
Shingle Calculator
This shingle calculator gives bundles, underlayment rolls, starter strip, ridge cap, drip edge and nails for…
Gutter and Downspout Calculator
This gutter calculator gives the gutter length, hangers and downspout count for a house, then checks…
Soffit and Fascia Calculator
This soffit calculator gives soffit panels, fascia lengths, J-channel and net free vent area for an…
Framing & Sheathing
4 calculators
Lumber Calculator
This lumber calculator works out board feet, actual dimensions and cost for any run, plus how…
Stud Calculator
This stud calculator works out how many studs a wall needs: field studs, corners, tees, king…
Plywood Calculator
This plywood calculator works out how many sheets a floor, wall or roof needs, with the…
Fence Post Calculator
Use this fence post calculator to work out how many posts a run needs, how much…
Interior Finishes
3 calculators
Baseboard Calculator
This baseboard calculator gives the linear feet a room needs, how many sticks of trim that…
Grout Calculator
This grout calculator works out how much tile grout a floor or wall needs from the…
Wallpaper Calculator
The wallpaper calculator below counts strips to work out how many rolls a room needs, including…
Exterior & Insulation
2 calculatorsPaving & Structure
3 calculators
Asphalt Calculator
This asphalt calculator works out how many tons a driveway, parking lot or path needs, and…
Stair Calculator
Use this stair calculator to work out riser height, tread depth, total run, stringer length and…
Retaining Wall Block Calculator
This retaining wall block calculator gives the blocks and caps a wall needs, plus the base…
Drainage & Earthworks
3 calculators
French Drain Calculator
This french drain calculator gives the stone, pipe and filter fabric a trench needs, with the…
Excavation Calculator
This excavation calculator gives the volume of a dig in bank and loose yards, how many…
Fill Dirt Calculator
This fill dirt calculator works out how much a hole, pad or low spot needs, with…