Construction

Gallons per Square Foot Calculator

Convert an area and depth into a water/liquid volume in gallons.

Area

Depth

Calculated Output

Total volume 62.338

Gallons per ft² (gal/ft²) 0.6234

Total volume 235.97

Formula: gallons = area (ft²) × depth (ft) × 7.48052

Step-by-Step Breakdown

1. Values used:

2. Area = 100

3. Depth = 1

5. Total volume = 62.338

6. Gallons per ft² = 0.6234gal/ft²

7. Total volume = 235.97

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The math behind it

Volume in cubic feet = area × depth (both in feet), so depth in inches is divided by 12.

One cubic foot of water holds 7.48052 US gallons, so multiply cubic feet by 7.48052.

100 ft² at 1 in deep → 100 × (1/12) × 7.48052 = 62.3 US gallons.

How many gallons in a cubic foot?

7.48052 US gallons (about 28.32 liters).