Road base calculator for Illinois

For a 100-foot lane that is 10 feet across and 6 inches deep after compaction, plan on about 31 tons of road base. Material adds up quickly on a lane, which is why free delivery matters when moving 30 tons can otherwise approach the stone cost. With graded crushed stone and fines, road base weighs about 3,000 lb per cubic yard and compacts into a tight supporting layer for equipment yards, roads, and driveways. Where the specification permits, use this calculation for recycled crushed concrete base too.

Lane calculations

1. For a lane, take the centerline measurement and multiply by its average width. A pad is simply length multiplied by width.
2. Use 4 inches compacted for light residential use, 6 for regular traffic and delivery trucks, and 8-12 beneath equipment or across soft subgrades.
3. Divide cubic feet by 27 to find yards, then multiply by 1.5 for tons and leave 10% extra for compaction.

Lane coverage and tonnage

Build a lane for its second winter

• Take out organic soil before placing the base. Leave topsoil below it and mud will work upward through the stone, regardless of depth.
• Lay woven geotextile before the stone on wet or weak subgrade. It helps a lane hold together over soft ground.
• Place and roll lifts no deeper than 4 inches before adding the next layer.
• Build a 2-3% slope from the centerline toward both sides to move rain off the surface rather than into the base.
• For a cleaner, dust-free driving surface, use #57 or driveway gravel on top.
• Moving 20-plus tons by hand can take a week. Include a tractor box blade or skid steer in the plan, since either can spread it in an afternoon.

Example: a 100-foot farm lane

One hundred by ten feet at 6 inches works out to 1,000 x 0.5 = 500 cubic feet = 18.5 cubic yards, about 28 tons, or 30-31 after the allowance. Plan for two tandem loads and arrange two drop points along the lane, not one pile at the gate. For a farm lane, split drops keep the spreading work moving along the run instead of forcing material uphill.

Equipment, container, and RV pads

Pad calculations use the lane formula, but choose depth for axle load rather than the calendar. A 12 x 40 RV pad at 6 inches compacted takes about 12 tons. At 8 inches, a 20 x 40 equipment yard needs 27. Because shipping containers bear on four corners, use a full 8 inches plus fabric under a container pad even on decent ground, or those corners can settle into the pad by spring.

Using crushed concrete for road base

Recycled concrete base can compact and carry loads similarly to virgin road base, and it often costs less. Review county specifications before making the change, since some call for virgin aggregate; it can still suit private pads and lanes. Quantity stays the same: 1.5 tons per yard, with the same lifts and crown.

Road base tonnage for lanes

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