Every free tool on one page — from rug size to concrete and paint. Each calculator shows its formula and a worked example, so you always know how the number was reached. Built for US homes (feet, inches, gallons), no sign-up, nothing stored.
Rug Size Calculator
The flagship tool — pick your room & furniture, get the ideal and minimum rug size, area, and placement tips.
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Square Footage Calculator
Area of any room in square feet or meters — rectangles and L-shapes.
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Paint Calculator
Exactly how many gallons of paint you need for a room.
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Curtain Length Calculator
How long should curtains be? Floor, sill, apron, or puddle looks.
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Tile Calculator
Exactly how many tiles you need for a floor or wall.
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Flooring Calculator
Square feet, waste, and material cost for flooring.
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Concrete Calculator
Cubic yards, feet, and bags of concrete for any slab.
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Drywall Calculator
How many 4x8 or 4x12 sheets for your walls and ceiling.
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Mulch Calculator
Cubic yards and bags of mulch for beds, by depth.
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Gravel Calculator
Gravel and stone by volume, in cubic yards and tons.
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Fence Calculator
Posts, rails, pickets, and cost for any fence run.
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Lumber Calculator
Board feet, framing counts, and lumber for your project.
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Wallpaper Calculator
How many rolls of wallpaper, including pattern repeat.
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Carpet Calculator
Square feet and rolls of carpet, accounting for seams.
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Roofing Calculator
Squares, bundles, and roofing material for any roof.
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Sod Calculator
Rolls and pallets of sod for your lawn.
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Paver Calculator
Pavers, sand, and base for patios and walkways.
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Stairs Calculator
Risers, treads, and stringer length for any rise.
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Pool Volume Calculator
Gallons and liters for rectangular, round, and oval pools.
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BTU Calculator
Heating and cooling size for any room.
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Deck Calculator
Boards, joists, and cost for your deck.
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TV Size Calculator
Screen size and viewing distance made easy.
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Every tool shows its math
Each calculator on this page is built the same way: enter your measurements, get an answer, and see the formula and a worked example underneath so you can verify it yourself. Whether you're sizing a rug for a king bed, ordering paint for a 10×12 room, or figuring out how many bags of concrete a small slab needs, the number is never a black box.
Prefer the full method? Pair each tool with its matching guide — the guides walk through measuring, waste allowances, and the mistakes people actually make, with the calculator linked in so you can apply it as you read.