Use a whole number.
Openings, container size and cost
Use 0 if there are no doors to subtract.
Use 0 if there are no windows to subtract.
Set to 0 to skip container rounding.
Optional. No currency conversion is applied.
Result updated. Containers needed: 2 containers.
Result summary
Paint estimate
Main project estimate from the values entered.
2 containers
This is a planning estimate for paint quantity and container rounding.
Key numbers
- Paint needed
- 1.89 gal
- Containers
- 2 containers
Key takeaway
This estimate covers 301 sq ft over 2 coats and rounds up to 2 containers.
Project details
Paint details
- Paintable area
- 301 sq ft
- Paint needed
- 1.89 gal
- Containers
- 2 containers
- Estimated cost
- $70
- Gross wall area
- 352 sq ft
- Openings subtracted
- 51 sq ft
- Coated area with waste
- 662.2 sq ft
Save or share this result
Copy a plain-English summary or download a CSV with the inputs, results, warnings and general-estimate note.
Exports are generated in your browser. NoNoiseTools does not need to store your numbers or require an account.
How this paint calculator works
The calculator estimates wall area from room dimensions or uses the wall area you enter directly. It subtracts door and window areas, multiplies by the number of coats, adds the waste allowance, then divides by the coverage per gallon or litre.
Assumptions
Coverage varies by product, surface texture and colour change. Container and cost estimates are rounded from the values entered and are not brand recommendations or cost guarantees.
What this calculator does not include
This tool does not estimate trim, cabinetry, ceilings, labour, local pricing or decorating choices. It is a general material estimate only.
Key terms and assumptionsShort notes about paint coverage, openings, waste allowance and cost limits.
- Coverage varies
- Paint coverage changes by product, surface and colour change. The coverage field should come from the paint label where possible.
- Openings
- Door and window areas are subtracted from wall area when entered.
- Waste allowance
- Waste allowance adds a buffer for touch-ups, roller loss and surface variation.
- No currency conversion
- Cost formatting is for readability only. Unit or region settings do not convert currencies.
Guides and methodology
Plain-English notes that explain the assumptions behind related calculators and tools.
Related calculators
Browse the Home calculators hub for related project tools.
- Flooring Calculator Estimate flooring area, waste allowance, boxes needed and rough material cost in square feet or square metres.
- Tile Calculator Estimate tiles needed from area, tile size, waste allowance, box quantity and optional material cost.
- Concrete Calculator Estimate concrete volume for a simple slab in cubic yards or cubic metres, with optional bag count from bag yield.
- Renovation Budget Calculator Build a rough renovation budget from cost categories, quotes, contingency and expected overruns.
- Decking Calculator Estimate deck area, decking boards, waste allowance and rough material cost from deck size and board dimensions.
- Roofing Calculator Estimate roof area from footprint, pitch factor, waste allowance and optional bundle or sheet coverage.
- Unit Converter Convert common length, weight, temperature, area, volume, speed and time units with a focused measurement converter.
- Basic Calculator Use a simple online calculator for everyday addition, subtraction, multiplication, division, percentages and quick arithmetic.
FAQs
How do I estimate how much paint I need?
Enter wall dimensions or wall area, number of coats, paint coverage and a waste allowance. The calculator subtracts doors and windows when those fields are included.
Should I include primer as a coat?
Include primer as a coat only if you want it counted in the paint estimate entered here.
Why does coverage vary by paint?
Paint coverage depends on the product, surface texture, colour change and application method. Check the label for the specific paint being used.
Can I use litres instead of gallons?
Yes. Choose metric units to use metres, square metres and litres. This changes labels and defaults only; it does not convert values already typed.
Does this include trim or ceilings?
No. This focused version estimates wall paint for a simple room or wall-area project.
Is the cost estimate guaranteed?
No. It is a rough material estimate from the price entered, not a quote or cost guarantee.