Estimate tons and cubic yards of crushed stone, #57 stone, #21A base, or aggregate gravel for driveways and foundations.
🪨 Aggregate Calculator
Cubic Yards
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Tons Needed
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Est. Cost ($42/ton)
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💡 Pro Tip
Compact aggregate in layers — no more than 4 inches at a time. Using a plate compactor on each layer dramatically increases load-bearing capacity and prevents settling.
Frequently Asked Questions
Q: How many tons of crushed stone do I need for a driveway?
For a 10×50 ft driveway at 4-inch depth: 500 × (4/12) ÷ 27 × 1.4 = 8.6 tons of crushed stone. Most standard gravel driveways use #57 stone or #21A base.
Q: What size crushed stone for a driveway base?
Use 3/4-inch or #57 crushed stone for the top layer. For the sub-base, use #21A (21A base or QP) which compacts firmly and resists ruts.
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