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How Much Compost for 600 Square Feet?

3.7cubic yards

at 2 inches deep — about 100 bags (1 cu ft each) or 1.85 tons

Depth	Cubic yards	Cubic feet	1 cu ft bags	Approx. tons
1 in	1.85 yd³	50 ft³	50	0.93
2 in (typical)	3.7 yd³	100 ft³	100	1.85
3 in	5.56 yd³	150 ft³	150	2.78

For amending beds, spread 1–3 inches of compost and work it into the top 6 inches of soil. For lawn top-dressing, ¼–½ inch is plenty.

The math: 600 sq ft × depth in feet ÷ 27 = cubic yards. One cubic yard of compost covers 324 sq ft at 1" · 162 sq ft at 2" · 108 sq ft at 3".

Compost compresses — if it will sit in a pile for weeks before spreading, order about 10% extra.

Different area?