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Tool · home improvement · free

Room paint coverage estimator

Estimate paint volume and full-container count for rectangular room walls from explicit dimensions, opening area, coats, waste allowance, coverage rate and container size.

Imperial or metricNo guessed coverage rateTool 1.0.0Formula 1.0.0

Enter the room and paint assumptions

Nothing is sent to an ICU account or server.

Formula and boundary

Explicit formulas

gross_wall_area = 2 × (length + width) × heightpaintable_wall_area = gross_wall_area − openingscoated_area = paintable_wall_area × coatsadjusted_area = coated_area × (1 + waste_pct ÷ 100)required_volume = adjusted_area ÷ coveragecontainers = ceil(required_volume ÷ container_size)

Assumptions

  • Walls are treated as rectangular and ceiling/floor paint is excluded.
  • Opening area is entered as one combined area in the selected unit system.
  • Coverage rate is supplied by the visitor; ICU does not guess a manufacturer coverage rate.
  • The same number of coats applies to all included wall area.
  • Waste allowance is an explicit visitor-entered percentage.

Known unknowns

  • Primer requirements
  • Surface texture, porosity and repair needs
  • Color-change hiding power
  • Spills, touch-up and leftover preferences beyond the entered waste allowance
  • Actual product coverage under site conditions

Validation rules

  • Unit-system changes clear unit-dependent numeric values instead of relabeling them.
  • Opening area must be smaller than gross wall area.
  • All required numeric inputs must be finite and within their declared bounds.

Unit safety

Imperial mode expects feet, square feet, square-feet-per-gallon and gallons. Metric mode expects metres, square metres, square-metres-per-litre and litres. Switching modes clears unit-dependent measurements instead of pretending the same number has a different unit.

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