Practical calculators for real home projects.
Estimate concrete, gravel, tiles, flooring, paint, drywall, fencing, decking, roofing materials and home electricity costs. Every calculator runs in your browser and shows the assumptions behind the estimate.
What you can calculate
Building, renovation, outdoor & energy tools
Use a calculator that matches the question you actually have: how much concrete, how many bags, how many tiles, how much paint, how much gravel, or how much an appliance costs to run.
Building Materials
Building Materials calculators
Concrete CalculatorFree concrete calculator for slabs, pads and rectangular pours. Calculate concrete volume, waste allowance a…Concrete Bag CalculatorCalculate the number of concrete bags needed for a slab, post hole, footing or small project. Enter bag yiel…Concrete Slab CalculatorCalculate concrete for a slab by length, width and thickness. Get volume, waste allowance and estimated mate…Footing CalculatorEstimate concrete volume for rectangular footing pours. Calculate total volume from footing length, width, d…Driveway Concrete CalculatorEstimate concrete needed for a rectangular driveway, parking pad or apron. Calculate volume, waste and optio…Gravel CalculatorFree gravel calculator for driveways, paths, landscaping and base layers. Estimate gravel volume, tonnes and…Gravel Driveway CalculatorCalculate gravel needed for a driveway from length, width and layer depth. Get cubic metres, tonnes and esti…Sand CalculatorCalculate sand needed for paving, leveling, mortar beds and landscaping. Estimate cubic volume, weight and m…Mortar CalculatorEstimate mortar volume for a rectangular masonry wall using wall dimensions, unit size and a joint allowance…Rebar CalculatorEstimate reinforcement bar count and total linear length for a simple rectangular slab. Use project plans an…Cement CalculatorEstimate cement volume and bag count from concrete volume and a target cement fraction. Use the mix design a…
Flooring & Finishes
Flooring & Finishes calculators
Paver CalculatorCalculate pavers needed for a patio, walkway or driveway. Enter paver size and area to estimate piece count,…Tile CalculatorEstimate tiles needed for floors, showers, backsplashes and walls. Calculate tile count, coverage and waste …Grout CalculatorEstimate tile grout quantity using tile size, joint width and joint depth. Get an approximate grout weight f…Flooring CalculatorCalculate flooring area and boxes needed for laminate, vinyl, hardwood and other flooring. Includes waste an…Laminate Flooring CalculatorEstimate laminate flooring boxes for a room. Calculate floor area, waste allowance and how many cartons you …Paint CalculatorCalculate paint needed for walls and ceilings. Account for doors, windows, coats and paint coverage to estim…Drywall CalculatorEstimate drywall sheets for walls and ceilings. Calculate area, sheet count and waste from project dimension…Insulation CalculatorEstimate insulation area and package count for walls, ceilings or lofts. Enter package coverage and waste to…
Outdoor Projects
Outdoor Projects calculators
Mulch CalculatorCalculate mulch volume for garden beds, landscaping and planting areas. Get cubic metres, cubic yards and es…Topsoil CalculatorEstimate topsoil needed for lawns, raised beds and landscaping. Calculate cubic metres, cubic yards, approxi…Fence CalculatorEstimate fence posts, rails and pickets for a straight run. Calculate quantities from fence length, post spa…Fence Post CalculatorCalculate fence post count from total fence length and spacing. Includes an optional extra-post allowance fo…Decking CalculatorEstimate decking boards for a rectangular deck. Calculate area, board count and waste from deck size, board …Retaining Wall Block CalculatorEstimate retaining wall blocks from wall length, height and block face dimensions. Includes waste and a simp…
Roofing & Exterior
Roofing & Exterior calculators
Roofing CalculatorCalculate roof surface area from plan dimensions and roof pitch. Estimate area for shingles, tiles or other …Shingle CalculatorEstimate asphalt shingles for a roof from roof area and bundle coverage. Includes waste and optional cost pe…Gutter CalculatorEstimate gutter length and downspout count from roof-edge length and planned spacing. Useful for quick resid…
Home Energy
Home Energy calculators
Appliance Electricity Cost CalculatorCalculate electricity cost from appliance wattage, daily usage, electricity price and days per month. See mo…AC Electricity Cost CalculatorEstimate air conditioner electricity use and cost from power draw, daily hours, days used and electricity ra…Heater Electricity Cost CalculatorCalculate electric heater running cost from wattage, hours per day, days used and your electricity rate.…Water Heater Electricity Cost CalculatorEstimate electric water heater energy use and cost from heater power, daily runtime and electricity price.…EV Charging Cost CalculatorEstimate home EV charging cost from battery size, charging efficiency, charges per month and your electricit…Home Heating Cost CalculatorEstimate home electric heating cost from average heating power, daily operating hours, days and electricity …
Built for useful answers, not filler
BuildCalc Tools focuses on practical calculators that solve a specific user problem. Each tool has an indexable URL, an explanation of the formula, assumptions, FAQs and links to closely related calculators.
Typical searches covered by the site include Concrete Calculator Concrete Bag Calculator Concrete Slab Calculator Footing Calculator Driveway Concrete Calculator Gravel Calculator Gravel Driveway Calculator Sand Calculator Mulch Calculator Topsoil Calculator, plus many more long-tail variations around project size, material type, quantity and cost.
For estimates that depend on supplier coverage, product yield, density or local rules, use the calculator as a first pass and verify the final number using the product documentation or project specifications.