Paint Cost Calculator to estimate paint quantity, coats, labor, supplies, delivery, and total painting cost for rooms, homes, offices, and exterior projects.
Home & Construction Calculators
Estimate paint materials, purchase quantities, labor, delivery, and total project costs.
About the Paint Cost Calculator
This calculator estimates paintable area, paint quantity, material cost, labor, delivery, and total project cost for interior and exterior painting projects.
Formula and assumptions
Project area is multiplied by the number of coats and waste allowance. The adjusted coverage is divided by coverage per unit, then purchase quantities are rounded up.
Worked example
For a 20 ft × 12 ft project with one coat, 10% waste, and 32 ft² coverage per unit, the calculator estimates the required purchase units and total cost.
Measurement checklist
- Measure each wall or project section separately.
- Confirm the actual paint coverage on the product label.
- Include the number of coats required.
- Add waste for touch-ups and uneven surfaces.
Manual calculation steps
- Calculate project area.
- Multiply by the number of coats.
- Add the waste allowance.
- Divide by coverage per purchase unit.
- Round purchase units upward.
- Add material, labor, and delivery costs.
Frequently asked questions
Why should I add waste?
Waste accounts for spills, touch-ups, uneven surfaces, and paint left in rollers or trays.
Why are purchase units rounded up?
Paint is normally purchased in complete cans or containers.
Can this replace a professional estimate?
No. It is a planning tool and should be confirmed with a qualified professional or supplier.
Common mistakes
- Mixing measurement units.
- Using the wrong coverage rate.
- Forgetting additional coats.
- Ignoring waste and touch-up paint.