Paint Calculator
Estimate paint containers from room dimensions and coverage.
Paint containers
2containers
- Paintable area
- 312 sq ft
- Coated area with waste
- 686.4 sq ft
- Assumption
- 2 coat(s), 350 sq ft per container
This is a planning estimate based on your inputs and assumptions, not an exact contractor, installer, or supplier quote.
What this calculator does
Estimate wall and optional ceiling paint using coats, openings, waste, units, and user-entered product coverage.
Inputs and what they mean
- Dimension unit
- — choice value.
- Room length
- — number value.
- Room width
- — number value.
- Wall height
- — number value.
- Doors and windows area
- — number value.
- Number of coats
- — number value.
- Coverage per container
- — number value.
- Waste allowance
- — number value.
- Include ceiling
- — yes/no value.
How to use it
- Enter the project dimensions and choose their unit.
- Adjust waste, coverage, quantity, and other assumptions.
- Use the rounded purchase estimate as a planning guide.
Formula
Paintable walls = 2(length + width) × height − openings. Optional ceiling is added, then coats and waste are applied before dividing by coverage.
Worked example
12 × 10 ft room
Estimate two coats after subtracting 40 sq ft of openings.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
This is a planning estimate based on your inputs and assumptions, not an exact contractor, installer, or supplier quote.