Home & build calculators

Free home & build calculators with formulas shown on every page.

• Square Footage calculatorRectangles, multi-room totals, m² and ft².
• Flooring calculatorArea plus waste factor, then boxes.
• Cubic Meters calculatorShipping volume: L×W×H → m³.
• Cubic Feet calculatorVolume from feet and/or inches.
• Cubic Yards calculatorConcrete and soil staple unit.
• Concrete calculatorSlab or footing, waste, m³ and bags.
• Gravel calculatorArea × depth → tonnes by density.
• Mulch calculatorGarden cover depth and bags.
• Asphalt calculatorPavement area × depth × density.
• Paint calculatorWalls minus openings, coats and waste.
• Tile calculatorCount tiles from size and grout gap.
• Electricity Cost calculatorWatts × hours × tariff.
• Led Savings calculatorYearly saving after swapping bulbs.
• Density calculatorρ = m / V — solve any one.
• Mpge calculatorEV energy as miles per gallon equivalent.
• Miles Per Kwh calculatorEV efficiency: mi/kWh or kWh/100km.
• Wallpaper calculatorRolls from wall height, roll length and pattern repeat.
• Fence calculatorPosts and boards from run length, spacing and board width.
• Soil calculatorVolume from area × depth, plus bag count.
• Fuel Cost calculatorDistance, consumption, price → litres and cost.
• Cbm Shipping calculatorPieces × volume, optional density for kg and a rate for freight.
• Roofing calculatorPlan area × pitch factor + waste.
• Stairs calculatorSplit storey height into risers; get rise and going.
• Hvac Btu calculatorArea × height × a rule-of-thumb factor.