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Paint Calculator – Estimates how many gallons of paint are needed ...

The Paint Calculator estimates how many gallons of paint are needed to cover a room's walls. This Paint Calculator helps you calculate the exact quantity of materials needed for your project, saving you from costly over-ordering or frustrating under-ordering. Add a 5–10% waste factor to any result before purchasing.

The formula behind this calculator: Wall area (minus doors/windows) divided by a gallon's typical coverage of about 350 sq ft. As a practical example: A room with 400 sq ft of wall area needs a bit more than 1 gallon for one coat. All results are calculated instantly in your browser — no data is stored or transmitted.

Paint Calculator FAQ

What does the Paint Calculator calculate?

Estimates how many gallons of paint are needed to cover a room's walls.

What is the difference between square footage and cubic footage?

Square footage measures 2D area (floor space). Cubic footage (volume) adds depth or height — used for concrete, gravel, soil, and insulation.

Should I order extra material beyond the calculated amount?

Always add 5–10% (sometimes 15% for tile or patterned materials) for cuts, waste, and future repairs. It's much cheaper to over-order once than to source matching materials later.

Is my data sent to a server?

No — calculations run directly in your browser. Your inputs are not stored or transmitted.