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Painting Calculator

Free

Painting · Litres, gallons and containers · default waste 0%

Enter your measurements

Numbers start at typical defaults — change anything. Every result states the inputs and assumptions used.

Applied once to each material quantity, then rounded up to the orderable increment.

Product assumptions — editable4

Sheet sizes, coverage rates, bundle counts, bag yield and similar come from the product you are buying. Change any of them to match your supplier — whatever you set is shown again with the result.

Typical latex coverage is 300–400 sq ft per gallon. Use the number on the product data sheet.

Enter your measurements and press "Calculate materials" to see the calculated quantity, waste-adjusted quantity and recommended order quantity.

What this calculator does

  • •Wall area = wall length × wall height
  • •Paintable area = wall area + ceiling area − (doors × area per door) − (windows × area per window)
  • •Gallons = paintable area × coats ÷ coverage per gallon
  • •Litres = gallons × 3.7854
  • •Containers = litres ÷ container size, rounded up
Deterministic by design: no AI, no lookups, no network calls — the same inputs always give the same numbers. Product values such as coverage rates and bundle counts are editable and shown with the result.