Square Feet to Cubic Yards Calculator

Convert square feet to cubic yards effortlessly. Perfect for planning concrete, gravel, mulch, or soil for landscaping and construction projects.

Why Convert Square Feet to Cubic Yards?

When working on outdoor or construction projects, you often measure surface area in square feet — like a patio, driveway, or garden bed. But materials like concrete, gravel, and soil are sold by cubic yards.

This calculator bridges that gap — helping you convert square footage into the volume you actually need to order.

Formula to Convert ft² to yd³

The conversion depends on depth (thickness).

Formula:

Cubic Yards = (Square Feet × Depth in inches) ÷ 324

Why 324?
There are 27 cubic feet in a cubic yard, and 12 inches in a foot:
1 yd³ = 3 ft × 3 ft × 3 ft = 27 ft³
→ 1 ft² × 1 inch = 1/12 ft × 1 ft = 1/12 ft³
→ 1 ft² × 1 inch over 27 ft³ = 1/324 yd³

How to Use the Calculator

1. Enter the area in square feet
2. Input the depth (choose inches, feet, or yards)
3. Click Calculate

You’ll instantly get:

• Volume in cubic yards
• Optionally: volume in cubic feet and cubic meters

Example

You want to lay 3 inches of gravel over a 500 sq ft area.

Cubic Yards = (500 × 3) ÷ 324 ≈ 4.63 yd³

So, you’ll need about 4.6 cubic yards of gravel.

Common Uses

• Pouring concrete slabs or footings
• Installing gravel driveways
• Laying mulch in flower beds
• Spreading topsoil for lawns
• Filling raised garden beds

FAQs❓

Why divide by 324?

Because you’re converting inches of depth over square feet into cubic yards — and 324 accounts for both the 12-inch-to-foot and 27-cubic-foot-to-yard conversions.

Can I use feet instead of inches for depth?

Yes! Just switch units in the calculator and it’ll adjust the math automatically.

Is this accurate for ordering concrete?

Absolutely — but always round up and add 10% for waste when ordering materials.