Powerful Square Feet to Gallons Calculator

Calculate the number of gallons needed per square foot for painting or flooring

Dimensions

Enter length, width, and height in feet to calculate gallons per square foot

Length (L)

Width (W)

Height (H)

Results

Enter dimensions to seelive results and step-by-step calculations.

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How to Use This Calculator

Step-by-step guide to get accurate results

What is a Gallons per Square Foot Calculator?

A Gallon to square feet calculator helps you determine how much liquid is needed per square foot given a specific depth. It is useful for pools, tanks, coatings, landscaping, irrigation, and construction projects.

How to Use the Calculator

Enter Length and Width

Base area dimensions.

Enter Depth / Height

Liquid depth in feet, inches, or yards.

Optional: Enter Price per Gallon

For cost calculation.

Click Calculate

Get gallons per square foot and total gallons instantly.

Tip

Ensure units are consistent for accurate results.

Key Features

Instant Calculation

Gallons per square foot and total gallons.

Multiple Units

Feet, inches, or yards supported.

Cost Estimation

Calculates total cost if price per gallon is entered.

Mobile-Friendly

Works on all devices.

Versatile Applications

Water, paint, coatings, and more.

Use Cases

Pool & Spa Planning

Estimate water volume.

Tank Filling

Calculate storage container capacity.

Irrigation & Landscaping

Plan water requirements.

Construction & Coatings

Estimate liquids for surfaces.

Education

Understand area, depth, and volume relationships.

Example Calculations

Example 1 – Basic Volume

Base: 10 ft × 5 ft | Depth: 1 ft | Volume: 10 × 5 × 1 × 7.48052 ≈ 374 gallons | Gallons per sq ft: 374 ÷ (10 × 5) ≈ 7.48 gal/ft²

Example 2 – Cost

Volume: 500 gallons | Price per gallon:

3 | Total Cost: 500 × 3 =

1,500

Frequently Asked Questions

What is a gallons per square foot calculator?

It calculates gallons needed per square foot for a given depth.

Why use it?

Saves time and ensures accurate liquid volume planning.

Units supported?

Feet, inches, and yards.

Works for pools and tanks?

Yes, ideal for any liquid-containing area.

Does it calculate total gallons?

Yes, total volume is displayed instantly.

Useful for landscaping/irrigation?

Yes, helps plan water requirements for gardens and ponds.

Can I calculate cost?

Yes, enter price per gallon to get total cost.

Does it account for uneven depth?

No, it assumes flat, uniform depth.

Mobile-friendly?

Yes, works on smartphones, tablets, and desktops.

Is it free?

Yes, completely free with no downloads required.

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Understanding Gallons per Square Foot

Formulas Used

A = L × W (Area in square feet)

V_ft³= A × H = (L × W) × H (Volume in cubic feet)

V_gal= V_ft³× 7.48052 (Volume in US gallons)

G = V_gal÷ A (Gallons per square foot)

Common Applications

Pool & Spa:Calculate volume and chemical dosing rates
Tank Design:Determine liquid storage capacity per floor area
Irrigation:Calculate application rates for landscaping
Construction:Estimate concrete, paint, or coating coverage
Aquaculture:Design fish tanks and water systems

Conversion Factor

1 cubic foot = 7.48052 US gallons

This conversion factor is exact and widely used in construction, plumbing, and engineering applications.

Example Calculation

Given:Length = 10 ft, Width = 8 ft, Height = 3 ft

Solution:

Area = 10 × 8 = 80 ft²

Volume = 80 × 3 = 240 ft³

Volume in gallons = 240 × 7.48052 = 1,795.32 gallons

Gallons per sq ft = 1,795.32 ÷ 80 = 22.44 gal/ft²