Square Feet to Cubic Yards Calculator

Already know your area in square feet? This tool converts it directly to cubic yards once you add a depth — perfect for ordering gravel, topsoil or concrete.

How the Math Works

The Square Feet to Cubic Yards Calculator uses a straightforward volume conversion formula: cubic yards equals area in square feet multiplied by depth in feet, then divided by 27. This works because cubic yards measure volume (3D space), while square feet measure area (2D space). When you multiply square feet by feet of depth, you get cubic feet. Since one cubic yard equals 27 cubic feet (3 feet × 3 feet × 3 feet), dividing by 27 converts cubic feet to cubic yards.

Practical Applications

To use this calculator practically, first measure your floor area in square feet and determine how deep you need the fill material to be in feet (or convert inches to feet by dividing by 12). For example, if you have a 500 square foot basement that needs 6 inches of dirt fill, convert 6 inches to 0.5 feet, then multiply 500 × 0.5 = 250 cubic feet, and finally divide by 27 to get approximately 9.26 cubic yards of fill material needed.

Day-to-Day Use

This calculation is essential for everyday projects like backyard landscaping, basement finishing, or driveway repairs. Instead of guessing how much soil, gravel, or concrete to order, you can accurately purchase exactly what you need, saving both money and time. Whether you're a DIY homeowner or a professional contractor, this tool prevents costly over-ordering or project delays from under-ordering materials.

Worked example

200 ft² at 3 in deep → 200 × (3/12) = 50 ft³ ÷ 27 = 1.85 yd³.

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