
How Far Does 1 Gallon of Paint Go? Coverage Tested
A controlled sensitivity test of the same room at four coverage rates, with walls and ceiling rounded separately.
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See the evidence
Founder & editorial lead
Home Improvement & Project Planning Editor
Alex Carter is a home improvement and project-planning editor specializing in construction math, material estimating, measurement, and practical DIY calculations. Alex reviews formulas, manufacturer guidance, industry standards, and common field practices to help homeowners estimate materials and plan projects more accurately.
Editorial responsibility
Alex sets the editorial scope for iNuggets, reviews calculator logic, selects sources, records substantive updates, and handles corrections. The review process pays particular attention to measurements, waste factors, unit conversions, package quantities, and where a manufacturer's instructions or locally adopted requirements must take priority.
Alex also reviews Product Lab protocols and the distinction between computational evidence and field evidence. Lab reports publish the input matrix, expected arithmetic, actual engine result, limitations, and downloadable data. Generated editorial artwork is labeled as illustration and is never treated as a project photograph.
Read the complete methodology →Reviewed by Alex Carter
Browse the focused public calculator set Alex maintains, organized by the kind of project it helps plan.
4 calculators
Estimate wall area, gallons, and a practical purchase quantity for a room.
Calculate floor area, waste allowance, and the number of boxes to order.
Estimate tile quantity from surface size, tile dimensions, and cutting waste.
Estimate 4×8 sheets for walls, with an optional ceiling and waste factor.
2 calculators
3 calculators
1 calculators
Edited by Alex Carter
Reproducible studies of coverage, package rounding, geometry, density, depth, spacing, and other decisions that can change an estimate.

A controlled sensitivity test of the same room at four coverage rates, with walls and ceiling rounded separately.
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Two rooms, one waste setting, and four carton coverage values reveal the cost of whole-box rounding.
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A fixed 80-square-foot field tested at four reserve levels, using 12-inch square tile.
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Slab, footing, and cylindrical post-hole cases checked against independent volume arithmetic.
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Four room cases test wall area, optional ceilings, waste, and upward rounding to standard 4 × 8 sheets.
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The same bed modeled at two, three, and four inches, plus a smaller high-reserve comparison.
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One driveway-base geometry tested across three density values and a deeper-layer case.
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A 160-foot run tested with four gate-opening totals while spacing and corner adjustments remain fixed.
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A fixed 16 × 12-foot deck tested across three designed gaps and two stock lengths.
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Four bead cross-sections show why width and depth must be measured instead of guessed.
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Six calculators compared before and after their published reserve settings to expose linear changes and purchase thresholds.
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Paired cases sit on either side of whole-unit thresholds for paint, flooring, tile, and sealant.
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