How much area does one gallon of paint cover?

One standard gallon of interior paint covers approximately 350 to 400 square feet (about 33 to 37 square meters) with a single coat.

How many coats of paint should I apply?

Two coats are industry standard for uniform color saturation, durability, and complete hide, especially when transitioning between colors.

Calculators & Converters•Free Online Tool

Paint Calculator for Walls, Rooms & Ceilings

Estimate exact interior and exterior paint requirements. Calculates paintable wall area after door and window deductions, accounts for multiple coats, optional ceilings, and provides can size purchasing breakdowns (gallons and quarts).

100% Free & Private

Unit System:

Currency:

Room Dimensions

Length (ft)

Width (ft)

Height (ft)

Doors (Deduct ~21 sq ft ea)

Windows (Deduct ~15 sq ft ea)

Number of Coats2 Coat(s)

Include Ceiling in painting calculation

Price per Gallon / Can ($)

Total Paint Required (2 Coats)

2.47 Gallons (9.34 Liters)

🛒 Recommended Store Purchase:2 × 1-Gallon Can(s) + 2 × 1-Quart Can(s)

Surface Area

432 sq ft (40.1 m²)

Estimated Cost

$111

Surface Area Breakdown

Net Paintable Walls:432 sq ft

Coverage Formula:350 sq ft / gallon

How to Use Paint Calculator for Walls, Rooms & Ceilings

Enter Room Dimensions

Input the length, width, and height of the room in feet or meters.

Set Doors & Windows

Specify the count of doors and windows to automatically deduct unpainted area.

Choose Coats & Ceiling

Select 1, 2, or 3 coats and toggle ceiling coverage to get recommended can counts.

Frequently Asked Questions

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Calculators & Converters•Free Online Tool

Paint Calculator for Walls, Rooms & Ceilings

100% Free & Private

Unit System:

Currency:

Room Dimensions

Length (ft)

Width (ft)

Height (ft)

Doors (Deduct ~21 sq ft ea)

Windows (Deduct ~15 sq ft ea)

Number of Coats2 Coat(s)

Include Ceiling in painting calculation

Price per Gallon / Can ($)

Total Paint Required (2 Coats)

2.47 Gallons (9.34 Liters)

🛒 Recommended Store Purchase:2 × 1-Gallon Can(s) + 2 × 1-Quart Can(s)

Surface Area

432 sq ft (40.1 m²)

Estimated Cost

$111

Surface Area Breakdown

Net Paintable Walls:432 sq ft

Coverage Formula:350 sq ft / gallon

How to Use Paint Calculator for Walls, Rooms & Ceilings

Enter Room Dimensions

Input the length, width, and height of the room in feet or meters.

Set Doors & Windows

Specify the count of doors and windows to automatically deduct unpainted area.

Choose Coats & Ceiling

Select 1, 2, or 3 coats and toggle ceiling coverage to get recommended can counts.

Frequently Asked Questions

Related Tools

Unit Conversion Calculator

Convert between metric and imperial units for length, mass, volume, temperature, and speed.

Open Tool

Tile Calculator for Floors, Walls & Backsplashes

Calculate tile count, box requirements, and material square footage with waste buffer.

Open Tool

Flooring Calculator for Hardwood, Vinyl Plank (LVP) & Laminate

Calculate total flooring square footage, cartons needed, waste buffer, and trim perimeter.

Open Tool

Percentage Calculator

Calculate percentages, percentage increases, decreases, and percentage differences.

Open Tool