Materials & quantities
Paint Quantity Calculator
Estimate paint containers from wall area, coats, and stated coverage.
Use this as a planning estimate and confirm coverage on the product label.
What the result means
The result is a calculated container count before rounding up to a purchasable size. Coverage varies with surface and application.
The formula
Wall area * coats / coverage per container
Results are displayed to at most two decimal places. Calculations use the unrounded inputs.
A worked example
Put the formula to work
- Wall area (square metres)
- 40
- Number of coats (coats)
- 2
- Coverage per container (square metres)
- 10
Containers required: 8
Forty square metres over two coats at ten square metres per container gives eight containers.
How to use this calculator
- Measure the paintable surface.
- Choose the coats and product coverage.
- Divide total coat area by coverage.
- Round up and confirm with the product instructions.
Why this number matters
Separating measured area, coats, and coverage makes the allowance visible.
Input definitions
- Wall area (square metres)
- The surface area to paint after measuring openings.
- Number of coats (coats)
- Planned coats; add a primer coat only if it uses the same coverage basis.
- Coverage per container (square metres)
- Coverage stated for one container; must be greater than zero.
Assumptions and limitations
- Does not account for texture, porosity, color changes, or unopened-container returns.
- Not a professional building estimate.
Methodology
The default result and worked example use the same calculation functions as the interactive tool. The formula cannot verify the quality or scope of your source data.
Read our calculation methodology
Last updated .