How Much Gravel for 100 Square Feet?

Answer at a glance — 100 sq ft

Depth	Cu ft	Cu yards	Tons (with 10% waste)
2 inches	16.7	0.62	1 tons
3 inches	25	0.93	1.4 tons
4 inches	33.3	1.23	1.9 tons
6 inches	50	1.85	2.9 tons

How we calculated it

For 100 sq ft at 4 inches:

1. Volume = 100 × 4 ÷ 12 = 33.3 cu ft
2. Cubic yards = 33.3 ÷ 27 = 1.23 cu yd
3. With 10% waste = 1.36 cu yd
4. Tons = 1.36 × 1.4 = 1.9 tons

Gravel density varies by type: pea gravel ≈ 1.35 tons/cu yd, crushed stone ≈ 1.5 tons/cu yd. The 1.4 figure is a reliable average.

Compare nearby sizes

Area	At 3" (paths)	At 4" (standard)	At 6" (driveway)
50 sq ft	0.7 tons	1 tons	1.4 tons
75 sq ft	1.1 tons	1.4 tons	2.1 tons
100 sq ft	1.4 tons	1.9 tons	2.9 tons
150 sq ft	2.1 tons	2.9 tons	4.3 tons
200 sq ft	2.9 tons	3.8 tons	5.7 tons

Depth guide by use

• 2–3 inches — decorative coverage, flower beds, tree rings
• 4 inches — paths, patios, play areas (most common)
• 6 inches — driveways (base layer), high-traffic areas
• 8–12 inches — driveway full build (base + surface combined)

Ordering tips

Gravel is sold by the ton or by the cubic yard depending on supplier. Always confirm which unit your quote uses before ordering. For 100 sq ft at 4 inches you need roughly 1.36 cu yd — if ordering by the ton, ask for 1.9 tons.

Use the Gravel Calculator to enter your exact dimensions and get a precise tonnage with price estimate.