9 free tools · Home & DIY Calculators
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Home & DIY Calculators.
Free home improvement calculators: square footage, concrete in cubic yards and bags, gravel in tons, mulch in yards and bags, and tile counts with waste. Measure once, buy the right amount, no sign-up.
Browse 9 toolsHome & DIY Calculators
9 tools · Free to use
Concrete Calculator
Work out how much concrete you need for a slab, footing or post holes in cubic yards, cubic metres and 40, 50, 60 or 80 lb bags. Includes waste and cost. Free.
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Square Footage Calculator
Calculate square footage for rooms, floors, and lots. Combine rectangles, circles, and triangles, subtract cut-outs, and convert to m² or acres.
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Gravel Calculator
Calculate how much gravel, crushed stone, river rock or sand you need in tons and cubic yards from your area and depth. Editable density, waste and cost. Free.
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Mulch Calculator
Calculate how much mulch you need in cubic yards and bags for garden beds of any shape. Depth guidance, 1.5, 2 or 3 cu ft bags, and bulk cost. Free and instant.
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Tile Calculator
Calculate how many floor or wall tiles you need from the area, tile size and grout width, with extra for cuts. Get boxes and cost too. Free, inches or cm.
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Electricity Cost Calculator
Work out how much an appliance costs to run per day, month and year from its watts, hours of use and your price per kWh. Heaters, AC, PCs and more. Free.
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Paint Calculator
Work out how many gallons of paint you need for a room: walls, optional ceiling, doors, windows and coats at your paint’s coverage. Gallons, quarts, litres.
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Roofing Calculator
Estimate roof area, roofing squares and shingle bundles from your house size, roof pitch, overhang and waste, with the pitch multiplier and underlayment.
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BTU Calculator
Find the BTU and AC size you need for a room from its size, ceiling height, sun exposure, occupants and use as a kitchen. Recommends a standard AC size. Free.
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A quick guide
Choosing the right Home & DIY Calculators
Buying too little means a second trip mid-project; buying too much wastes money and leaves you with bags in the garage. These calculators turn your measurements into the amounts you actually order, with sensible extra for waste.
Every calculator accepts several areas at once, including rectangles, circles and triangles, in feet and inches or metres, and shows the answer in the units suppliers sell: cubic yards, tons, bags, boxes and square feet.
Digital ToolPad brings together 9 free Home & DIY Calculators in one collection. Open a tool, add your input, and review the result on your device. All tool processing happens in your browser, without uploading your data to our servers for processing.
How accurate are these DIY calculators?
They are as accurate as your measurements. They use standard volume formulas and published bag yields; material densities are typical values you can change. Always round up and follow product and local building guidance.
Can I measure irregular areas?
Yes. Split the space into rectangles, circles and triangles, add each one, and subtract cut-outs such as islands, ponds or patios.
Do the calculators work in metric?
Yes. Switch to metres to enter dimensions in metres or centimetres. Results show both US and metric units.
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