Construction Calculators

Every calculator on the site, grouped by the job on site. Each one takes metric or US units, shows the formula and the steps with your numbers, keeps its inputs in the link so you can share or repeat a result, and prints a dated record. Nothing you type is uploaded.

Concrete

• Concrete calculator — cubic yards or m³ and bags for a slab, wall, footing or column.
• Concrete slab calculator — pads, patios and floors with a thickened edge and gravel base.
• Concrete bag calculator — 40, 50, 60 and 80 lb or 20–30 kg premix bags side by side.
• Concrete footing calculator — strip, pad and round pier footings, with footing rebar.
• Concrete step calculator — concrete for a flight of solid steps and a landing.
• Sonotube calculator — concrete for round column forms of any diameter.
• Concrete weight calculator — weight of normal, reinforced or lightweight concrete.
• Cement mix calculator — cement, sand, gravel and water for a mix ratio such as 1:2:4.
• Concrete slab rebar calculator — bars, spacing, laps and weight for a slab grid.

Masonry and walls

• Concrete block calculator — CMU and cinder blocks for a wall.
• Retaining wall calculator — blocks, caps and gravel for a segmental retaining wall.

Gravel, soil and asphalt

• Gravel calculator — yards, tons and bags of gravel, crushed stone or pea gravel.
• Dirt calculator — fill dirt and backfill with a compaction allowance and truckloads.
• Asphalt calculator — tons of hot-mix asphalt for a driveway or lot.
• Cubic yard calculator — cubic yards, cubic feet and m³ for any shape, bags and truckloads.
• Cubic yards to tons calculator — convert volume to weight and back for common materials.
• Dump truck capacity calculator — cubic yards and tons per truck load from the body size, and the loads a job needs.

Earthwork and slopes

• Cut and fill calculator — cut, fill and net volumes by the grid method, with swell and shrinkage.
• Rise over run calculator — slope percentage, angle, ratio and grade.
• Roof pitch and slope calculator — pitch in x/12, angle, percent and rafter length.