Unit Converter
Paint Calculator
Estimate paint units from wall area, coverage per unit, coat count, and waste allowance.
Formula and usage notes
paint units = wall area x coats x (1 + waste percent) / coverage.
Estimate paint units from wall area, coverage per unit, coat count, and waste allowance.
Practical examples
480 square feet, 2 coats, 10% waste, and 350 coverage needs about 3.02 paint units.
Round up to whole cans when buying paint.
Subtract large windows and doors if the estimate is too high.
Frequently asked questions
What inputs does this calculator need?
Wall area, Coverage per paint unit, Coats, Waste allowance.
How should I round the result?
Keep extra digits while comparing values, then round for the final decision or report.
Can I reuse the result in another calculation?
Yes, but preserve the original inputs and units so the next calculation stays traceable.