Surface-based estimate
Calculate wall perimeter × height, optional ceiling area, and opening deductions.
Room paint coverage calculator
Estimate paint from the surfaces you will cover.
Model walls and ceilings separately, subtract openings, choose coats, and round to the container sizes you can buy.
Use the free toolRuns in this browser
paint calculator
Coverage varies by surface and product. Enter the number printed on the selected paint rather than relying on a universal marketing estimate.
Result
The jobs this tool completes
Built around the failure points.
Real product coverage
Use the selected coating's label and number of coats instead of a fixed hidden constant.
Purchase rounding
See raw volume, waste allowance, and a practical container mix separately.
Workflow
From input to an auditable output.
- Choose units and enter room length, width, and wall height.
- Set doors, windows, ceiling, coats, labeled coverage, and waste allowance.
- Review net area, coated area, raw volume, adjusted volume, and suggested container rounding.
Learn the details
Use the result with fewer surprises.
Guide
How to calculate wall area for paint
Measure room perimeter and wall height, subtract openings, include ceilings, and avoid common area mistakes.
Read guide →GuidePaint coverage, coats, and waste allowance
Turn measured surface area into a paint estimate using the product label, number of coats, surface condition, and waste.
Read guide →Common questions
What this tool does—and does not do.
Surface-based estimate
Calculate wall perimeter × height, optional ceiling area, and opening deductions.
Real product coverage
Use the selected coating's label and number of coats instead of a fixed hidden constant.
Purchase rounding
See raw volume, waste allowance, and a practical container mix separately.
Does this guarantee the result will be accepted elsewhere?
No. The tool completes and explains its calculation or transformation, but another platform can apply different limits, rules, encoders, or policies. Verify consequential output in the destination.
Ready
Estimate paint
Return to the tool with your inputs still in this tab.