Paint Calculator - Free Home Improvement Calculator

Room length

Room width

Wall height

Doors

Windows

Paint coats

Primer coats

Waste allowance

Coverage / gallon

ft²

Container size

gal

Price / container

Include ceiling

Paintable area301 ft²

Paint required1.81 gal

Paint containers2

Primer required0.9 gal

Primer containers1

Paint cost$110.00

Material quantities are planning estimates. Confirm actual package coverage, density, dimensions and installation requirements before purchasing.

How to use the Paint Calculator

Choose imperial or metric measurements where available.
Enter the dimensions of the room, surface, structure or material.
Add waste, packaging, density or price information when relevant.
Review the calculated material quantity and round purchasing quantities according to the supplier's actual package size.

Examples

Formula

Paintable area = wall and ceiling area − doors/windows. Required paint = coated area ÷ paint coverage.

Worked example

Measure the room, subtract openings, choose the number of coats and enter the coverage printed on your paint container.

Frequently asked questions

Is this paint calculator free?

Yes. It is free to use and does not require an account or paid API.

Should I include extra material for waste?

Usually yes. Cutting, breakage, pattern matching, compaction and job-site conditions can increase actual material use. Choose a waste allowance appropriate for the project and material.

Are material quantities exact?

No. The result is a planning estimate based on your measurements and assumptions. Confirm package coverage, material density, product instructions and job requirements with the supplier or contractor.

Can I use metric measurements?

Yes. The Home & DIY calculators support metric or imperial measurements where those units are relevant.

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