Home calculators

Home calculators estimate household quantities—paint, coverage, and similar DIY measures—from area and rate inputs.

Coverage rates on a product label override the example defaults. Add waste and extra coats as the manufacturer recommends.

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AC BTU Calculator

Rough cooling BTU from room size (≈20 BTU/ft²).
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Energy Cost Calculator

Electricity cost from kWh and rate.
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Flooring Quantity Calculator

Flooring area with waste and box count.
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Paint Coverage Calculator

Paint gallons from wall area, coats, and coverage rate.
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Wallpaper Rolls Calculator

Rolls needed from wall area and roll coverage.
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