# How Many Gallons of Paint to Paint a House Exterior: A Comprehensive Guide

**Table of Contents**

- Introduction
- Factors Affecting Paint Consumption
- Calculating the Surface Area
- Choosing the Right Paint
- Estimating the Number of Gallons
- Additional Considerations
- Conclusion

### Introduction

When it comes to painting the exterior of your house, one of the most important questions you’ll need to answer is how many gallons of paint to buy. Buying too little paint can lead to incomplete coverage, while buying too much can be a waste of money. In this article, we’ll break down the factors that affect paint consumption, calculate the surface area of your house, choose the right paint, estimate the number of gallons you’ll need, and discuss additional considerations.

### Factors Affecting Paint Consumption

#### Surface Roughness

The rougher the surface, the more paint it will absorb. If your house has a rough texture, such as stucco or brick, you’ll need more paint than if it had a smooth surface like vinyl siding.

#### Color Change

If you’re changing the color of your house significantly, you may need more paint to achieve adequate coverage. Dark colors tend to require more paint than light colors.

#### Number of Coats

The number of coats you plan to apply also affects paint consumption. If you want a durable, long-lasting finish, you may need to apply multiple coats, which will require more paint.

### Calculating the Surface Area

To estimate the number of gallons of paint you’ll need, you’ll need to calculate the surface area of your house. Here’s a simple formula:

- Measure the length and width of each side of your house in feet.
- Multiply the length and width of each side to get the square footage.
- Add up the square footage of all sides to get the total surface area.

For example, if your house has four sides with the following dimensions:

- Side 1: 40 feet x 20 feet = 800 square feet
- Side 2: 30 feet x 20 feet = 600 square feet
- Side 3: 40 feet x 20 feet = 800 square feet
- Side 4: 30 feet x 20 feet = 600 square feet

The total surface area would be 2,800 square feet.

### Choosing the Right Paint

Not all paints are created equal, and the type of paint you choose can affect the number of gallons you’ll need. Here are some factors to consider:

**Latex vs. Oil-Based**: Latex paint is generally easier to clean up and dries faster than oil-based paint. However, oil-based paint provides a harder, more durable finish.**Finish**: The finish of your paint can also affect paint consumption. Flat finishes tend to require less paint than semi-gloss or high-gloss finishes.

### Estimating the Number of Gallons

Once you’ve calculated the surface area of your house and chosen the right paint, you can estimate the number of gallons you’ll need. Here’s a general rule of thumb:

**Smooth surfaces**: 300-400 square feet per gallon**Rough surfaces**: 200-300 square feet per gallon**Multiple coats**: 100-200 square feet per gallon

Using the example above, if you have a smooth surface and want to apply one coat of paint, you would need:

- 2,800 square feet / 350 square feet per gallon = 8 gallons of paint

### Additional Considerations

**Trim and Accents**: Don’t forget to include the trim and accents when calculating the surface area of your house. These areas may require additional paint.**Decks and Railings**: If you have a deck or railing, you may need to paint these areas separately. Consider using a specialized deck stain or railing paint.**Waste**: Always add 10-20% to your total to account for waste and spills.

### How Many Gallons of Paint to Paint a House Exterior?

**For Smooth Surfaces**:

- Small houses (1,000-2,000 square feet): 4-6 gallons
- Medium houses (2,000-3,500 square feet): 6-10 gallons
- Large houses (3,500-5,000 square feet): 10-14 gallons

**For Rough Surfaces**:

- Small houses (1,000-2,000 square feet): 6-10 gallons
- Medium houses (2,000-3,500 square feet): 10-16 gallons
- Large houses (3,500-5,000 square feet): 16-20 gallons

### Conclusion

Now you know **How Many Gallons of Paint to Paint a House Exterior**. Remember to calculate the surface area of your house, choose the right paint, and consider additional factors like trim and accents, decks and railings, and waste. With this guide, you’ll be able to estimate the number of gallons you’ll need and achieve a beautiful, professional-looking finish.