How To Calculate How Much Paint For Exterior Of House

Paint Calculation Formula:

\[ \text{Paint (gallons)} = \frac{\text{Perimeter} \times \text{Height} - \text{Openings}}{\text{Coverage}} \times \text{Coats} \]

Perimeter (feet):

feet

Height (feet):

feet

Openings (square feet):

sq ft

Coverage (square feet per gallon):

sq ft/gallon

Number of Coats:

coats

Paint Needed (gallons):

1. What is the Paint Calculation Formula?

The paint calculation formula estimates how much paint is needed for the exterior of a house by considering the total paintable surface area, paint coverage rate, and number of coats required.

2. How Does the Calculator Work?

The calculator uses the paint calculation formula:

\[ \text{Paint (gallons)} = \frac{\text{Perimeter} \times \text{Height} - \text{Openings}}{\text{Coverage}} \times \text{Coats} \]

Where:

\( \text{Perimeter} \) — Total distance around the house (feet)
\( \text{Height} \) — Height of the exterior walls (feet)
\( \text{Openings} \) — Total area of windows and doors (square feet)
\( \text{Coverage} \) — Paint coverage rate (square feet per gallon)
\( \text{Coats} \) — Number of paint coats required

Explanation: The formula calculates the net paintable area by subtracting openings from the total wall area, then divides by coverage rate and multiplies by number of coats.

3. Importance of Accurate Paint Calculation

Details: Accurate paint calculation helps avoid waste, ensures you have enough paint for the job, prevents color mismatches from different batches, and helps with budget planning.

4. Using the Calculator

Tips: Measure perimeter accurately, include all windows and doors in openings calculation, check paint can for actual coverage rate (typically 250-400 sq ft/gallon), and plan for 2-3 coats for best results.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical paint coverage rate?
A: Most quality exterior paints cover 250-400 square feet per gallon, depending on surface texture and paint type.

Q2: Should I include trim and accents in this calculation?
A: No, this calculator is for main wall surfaces only. Trim, shutters, and accents require separate calculation.

Q3: How do I measure perimeter accurately?
A: Walk around the house with a measuring tape or use property plans. Include all sides of the house.

Q4: What about textured surfaces or rough siding?
A: Textured surfaces may require 10-20% more paint. Adjust coverage rate accordingly.

Q5: Should I buy extra paint for touch-ups?
A: Yes, it's recommended to buy 10-15% extra paint for future touch-ups and color matching.