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Gallons per Square Foot Calculator

Calculate paint, sealer, coating, or water volume required per square foot of surface.

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Input Parameters

Enter details for calculation.

Surface Area (sq ft)

Coverage Rate (sq ft per gallon)

Number of Coats

Total Required

2.86 Gallons

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Expert Tip

Standard wall paint covers roughly 350-400 sq ft per gallon; concrete sealers cover 150-250 sq ft.

Calculation Methodology & Details

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Formula

Total Gallons = (Surface Area × Coats) / Coverage Rate

Applies standard construction engineering calculation formulas.

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Important Disclaimer

The calculations provided are for educational and structural planning purposes. Always consult a qualified general contractor or structural engineer for site-specific verification.

How to Calculate Step-by-Step

Follow these steps to complete the calculation:

Step 1

Enter total surface square footage to cover.

Step 2

Input manufacturer coverage rate per gallon.

Step 3

Select number of coats to determine total gallons needed.

Detailed Insights & Expert Guide

ℹ️ About this Calculation

This tool computes required liquid volumes in gallons for painting, waterproofing, sealing, or irrigation based on square footage and manufacturer coverage rates.

Variable Glossary

Input

Surface Area

Total coverage area measured in square feet.

Parameter

Coverage Rate

Square feet covered by a single gallon of coating.

FAQ

How many gallons of paint do I need for 1,000 sq ft?

At 350 sq ft per gallon coverage with 2 coats, you need about 5.7 gallons (round up to 6 gallons).

Does rough texture increase gallon requirements?

Yes, porous or textured surfaces like stucco, unsealed masonry, or rough wood require up to 25% more product.

Should I buy extra paint or sealer?

Yes, buy 10% extra for touch-ups, spills, and cut-in edges.