Home improvement calculators
Concrete, mulch and gravel, square footage and paint. Every tool below is free, works instantly in your browser and explains the formula behind the result.
Buying the right amount of material saves money and extra trips to the store. These calculators estimate concrete for slabs, mulch, gravel, topsoil and sand for landscaping, square footage for flooring and paint for walls — with sensible waste allowances and bag counts based on standard product sizes.
17 tools in this category
- Concrete CalculatorWork out how much concrete to order for a slab, patio, shed base or driveway.
- Mulch & Gravel CalculatorEstimate how much mulch, gravel, topsoil or sand to buy for a garden bed, path or driveway, in cubic yards, approximate tons and bags.
- Square Footage CalculatorCalculate the area of a room, floor, lot or any simple shape in square feet, and optionally the total cost from a price per square foot.
- Paint CalculatorWork out how much paint to buy for a room.
- Sheet Metal Gauge to MM ConverterFind the thickness of a sheet metal gauge in mm and inches.
- Feet and Inches CalculatorDo math with feet and inches the way carpenters need it — add or subtract two lengths, or multiply and divide by a number.
- Inches to Decimal & Decimal Feet ConverterConvert between decimal feet used on plans and surveys and the feet-and-inches used on tape measures.
- Lumber Size Converter (Nominal to Actual)A 2x4 isn’t 2 by 4 inches.
- Board Feet CalculatorCalculate how many board feet of lumber you are buying — and what it costs — for hardwood and rough lumber priced by the board foot.
- Pipe Size Converter (NPS to MM)Find the real outside diameter of a nominal pipe size and its metric DN equivalent — for steel and PVC pipe.
- Wrench & Socket Size ConverterFind the closest metric or SAE wrench or socket size, and whether it is a safe substitute.
- Drill Bit Size ConverterConvert a drill bit size between fractional inches, letter sizes and metric — and find the nearest bit in each system.
- Sandpaper Grit ConverterCompare sandpaper grits between the US (CAMI) and European (FEPA “P”) systems, and see what each grit is for.
- Mesh to Micron ConverterConvert screen and sieve mesh numbers to opening size in microns (µm) and millimeters, or find the mesh for a particle size.
- Thread Pitch ConverterConvert between inch threads (threads per inch) and metric thread pitch (mm between threads).
- Paint Application Temperature GuidePaint needs the right temperature to cure properly.
- Concrete Curing Temperature GuideConcrete gains strength through a chemical reaction that depends on temperature.
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