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How Much Compost for 100 Square Feet?

0.62cubic yards

at 2 inches deep — about 17 bags (1 cu ft each) or 0.31 tons

Depth	Cubic yards	Cubic feet	1 cu ft bags	Approx. tons
1 in	0.31 yd³	8.3 ft³	9	0.15
2 in (typical)	0.62 yd³	16.7 ft³	17	0.31
3 in	0.93 yd³	25 ft³	25	0.46

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: 100 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?