Paint Calculator

Calculate how many gallons of paint you need for walls, ceilings, and rooms. Get accurate paint estimates with coverage rates and number of coats.

Calculator Inputs
Your Results

Enter your values and click Calculate to see results

Accurate Paint Estimation

Precise Measurements

Calculate exact paint quantities based on room dimensions, wall height, and coverage rates.

Multiple Coats

Account for primer and multiple paint coats to ensure complete coverage and color accuracy.

Cost Estimates

Get budget, mid-range, and premium paint cost estimates to plan your painting budget.

Paint Coverage Formula

The formula calculation is standard for this mathematical operation.

Gallons = \frac{(Wall\ Area + Ceiling\ Area - Openings) \times Coats}{Coverage\ Rate}

Variables Explained:

Wall Area
2(Length × Height) + 2(Width × Height)
Ceiling Area
Length × Width (if painting ceiling)
Openings
Total area of doors and windows
Coats
Number of paint coats (typically 2)
Coverage Rate
Square feet per gallon (typically 350)

Worked Examples

Standard Bedroom
12×10 ft room, 8 ft walls, 2 coats, not painting ceiling

Inputs:

room Length:
12
room Width:
10
wall Height:
8
coats:
2
coverage:
350
paint Ceiling:
no
door Windows:
40

Result:

2 gallons needed

Large Living Room
20×15 ft room, 9 ft walls, 2 coats, painting ceiling

Inputs:

room Length:
20
room Width:
15
wall Height:
9
coats:
2
coverage:
350
paint Ceiling:
yes
door Windows:
60

Result:

5 gallons needed

Small Bathroom
8×6 ft room, 8 ft walls, 2 coats, painting ceiling

Inputs:

room Length:
8
room Width:
6
wall Height:
8
coats:
2
coverage:
350
paint Ceiling:
yes
door Windows:
15

Result:

1 gallon needed

Frequently Asked Questions