Construction & DIY
Material quantity calculators for concrete, paint, lumber, tiles and HVAC.
Concrete Volume & Bags Calculator
Cubic yards / metres of concrete needed for slabs, footings, columns and posts, plus bags-of-mix conversion.
Paint Coverage Calculator (Litres / Gallons)
Litres or gallons of paint needed by wall area, coats, primer and surface texture coverage.
Lumber Board Feet & Cost Calculator
Calculate board feet, linear feet and total cost for hardwood and softwood lumber.
Tile & Flooring Coverage Calculator
Tiles or boxes needed for any floor or wall area, with pattern waste and grout lines.
BTU & HVAC Sizing Calculator
BTUs needed to heat or cool a room from area, ceiling height, insulation, climate and sun exposure.
MIG Welding Settings Calculator (Amps, Volts, Wire Speed)
Recommended MIG welding voltage, amperage and wire feed speed by metal thickness, wire diameter and material.
Landscaping Material Calculator (Gravel, Mulch, Soil, Sand)
Cubic yards, weight, bags and cost of gravel, mulch, topsoil or sand needed for any area and depth.
Fence Post Concrete & Spacing Calculator
Number of fence posts, hole size and bags of concrete needed for any fence length and post spacing.
What these tools are for
Material estimating is arithmetic over geometry, and the arithmetic is the easy half. What decides whether a delivery is right is the allowances: waste from cuts, the overlap or grout gap between units, and the fact that materials are sold in fixed increments you cannot buy a fraction of.
Waste factor scales with pattern complexity rather than area. A straight tile layout might waste 10%; a herringbone or diagonal layout on the same floor can waste twice that, because every edge cut is at an angle and the offcut is rarely reusable.
Concrete is the least forgiving because you cannot easily add to a partial pour. Round up, order for the void plus a margin, and remember that bag yields are for the mixed volume rather than the dry contents.
Which one do I want?
- Working out concrete for footings or a slab
- Concrete calculator, or fence post concrete for postholes.
- Ordering tile, paint or decking
- Tile, paint or deck board — each applies its own waste allowance.
- Sizing heating or cooling
- BTU calculator.