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Gravel Type & Size Calculator

Estimate any gravel grade, 2B, 411, Class 5, ABC and others, from your area and depth. The volume math is the same; only density varies slightly by type.

Gravel Type & Size Calculator

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tons
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cubic yards
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bags (0.5 ft³)
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est. cost
Gravel Type & Size Calculator, live preview
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Enter values to see your estimate.

How to Calculate Gravel by Type

Change the calculator above and watch every figure and the diagram below update live.

Top-down view (area × depth)

W L depth 4"

Step 1 · Area

20 ft × 10 ft = 200 ft²

Step 2 · Volume (× depth, ÷ 27)

200 ft² × 0.33 ft ÷ 27 = 2.47 yd³

3.46
tons (× 1.4)
134
bags (÷ 0.5 ft³)

These figures update automatically as you change the calculator above.

Gravel coverage by depth

Approximate coverage of one cubic yard of gravel at common depths.

Approximate coverage of one cubic yard of gravel at common depths.
DepthCoverage per yd³Relative coverage
1" 324 sq ft
100%
2" 162 sq ft
50%
3" 108 sq ft
33%
4" 81 sq ft
25%
6" 54 sq ft
17%
3 in
3"

At 3 inches deep, one cubic yard of gravel covers 108 sq ft.

Gravel Type FAQs

How do I calculate a specific gravel grade?
Volume is the same for every grade: area × depth ÷ 27 for cubic yards. Just confirm the supplier's tons-per-yard for that specific stone.
What is 2B gravel?
2B is clean crushed stone about 3/4–1 inch with no fines, good for drainage and driveways where you don't need compaction.
What is 411 or Class 5 gravel?
These are crushed stone blended with fines that compact into a firm base, commonly used under driveways, pavers and roads.
Does gravel size change how much I need?
Not the volume, but larger, cleaner stone weighs slightly less per yard, and compacting grades need an extra 10–15%.

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