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BuildMath

Unit Conversion · Free calculator

Square Feet to Cubic Yards Calculator

Square feet measure area; cubic yards measure volume. To convert, you need a depth: 100 sq ft at 4" deep is 1.23 cubic yards. Enter your area and depth to get yards, cubic feet and bag counts.

Quick answer

100 sq ft @ 4"
1.23 yd³
1 yd³ covers @ 4"
81 sq ft
1 yd³ covers @ 3"
108 sq ft
1 yd³ covers @ 2"
162 sq ft

▍Sq Ft → Cubic Yards

sq ft
in
Material (for bags & weight)
Waste Factor
Cubic yards
1.36yd³
incl. 10% waste · order 1.50 yd³
Cubic feet
36.67ft³
Weight
2.75tons
80 lb bags
62
60 lb bags
82
40 lb bags
123

Square feet to cubic yards chart

Net volume, no waste added. Add 5–10% when ordering.

Area2" deep3" deep4" deep6" deep
50 sq ft0.31 yd³0.46 yd³0.62 yd³0.93 yd³
100 sq ft0.62 yd³0.93 yd³1.23 yd³1.85 yd³
150 sq ft0.93 yd³1.39 yd³1.85 yd³2.78 yd³
200 sq ft1.23 yd³1.85 yd³2.47 yd³3.70 yd³
250 sq ft1.54 yd³2.31 yd³3.09 yd³4.63 yd³
300 sq ft1.85 yd³2.78 yd³3.70 yd³5.56 yd³
400 sq ft2.47 yd³3.70 yd³4.94 yd³7.41 yd³
500 sq ft3.09 yd³4.63 yd³6.17 yd³9.26 yd³
750 sq ft4.63 yd³6.94 yd³9.26 yd³13.89 yd³
1,000 sq ft6.17 yd³9.26 yd³12.35 yd³18.52 yd³

How far one cubic yard goes

DepthSq ft per yd³Typical use
1"324Paver bedding sand
2"162Mulch refresh, top dressing
3"108Mulch beds
4"81Concrete slabs, gravel paths
6"54Garage slabs, driveway base
12"27Footings, deep fill

How to convert square feet to cubic yards

  1. Convert depth to feet: inches ÷ 12 (4" = 0.333 ft)
  2. Cubic feet = square feet × depth in feet (100 × 0.333 = 33.33 ft³)
  3. Cubic yards = cubic feet ÷ 27 (33.33 ÷ 27 = 1.23 yd³)
  4. Shortcut: yd³ = sq ft × depth (in) ÷ 324

Add a waste factor before ordering — uneven subgrade and spillage eat 5–10%.

Trade pro tips

  • Measure irregular areas as rectangles and triangles, then add the pieces together.
  • Ready-mix is ordered in ¼ yd³ steps; bulk gravel and mulch usually in ½ or whole yards.
  • Mulch and topsoil settle — order depth plus about 10%.

Frequently asked questions

How many cubic yards is 100 square feet?

It depends on depth: 100 sq ft is 0.62 yd³ at 2", 0.93 yd³ at 3", 1.23 yd³ at 4" and 1.85 yd³ at 6".

How many square feet does a cubic yard cover?

324 sq ft at 1" deep. Divide 324 by your depth in inches: 162 sq ft at 2", 108 at 3", 81 at 4", 54 at 6".

Can you convert square feet to cubic yards without depth?

No. Square feet is area and cubic yards is volume, so you need a thickness or depth to convert between them.

How many cubic yards of concrete for 500 square feet?

At 4" thick, 6.17 yd³ (6.79 yd³ with 10% waste). At 6" thick, 9.26 yd³.