Road base calculator for Maine

A lane measuring 100-foot by 10 feet with 6 inches of compacted base calls for about 31 tons of road base. Material needs can climb quickly on long lanes, making free delivery particularly relevant when moving 30 tons can otherwise cost nearly as much as the stone. Road base contains graded crushed stone and fines, weighing about 3,000 lb per cubic yard, and compacts into a dense foundation for equipment yards, driveways, and roads. This calculation also applies to recycled crushed concrete base when the specification permits its use.

Lane calculations

1. For lanes, take the length along the centerline and apply the average width. For pads, multiply length by width.
2. Use 4 inches compacted for light residential use, 6 for daily traffic and delivery trucks, and 8-12 beneath equipment or across soft subgrades.
3. Divide cubic feet by 27 for yards, multiply by 1.5 for tons, then leave +10% for compaction.

Coverage and lane totals

Building a lane for the second winter

• Begin by removing organics. Placing base on topsoil lets mud pump into the stone, regardless of how thick the material is poured.
• Put woven geotextile down before stone where the subgrade is wet or soft. It is an economical way to add strength beneath a lane.
• Place and roll lifts no deeper than 4 inches before adding another layer.
• Build a 2-3% crown from the centerline toward each edge, directing rain away rather than allowing it into the base.
• For a tidy, low-dust driving surface, use #57 or driveway gravel as the top layer.
• Spreading 20-plus tons by hand can consume a week of your life. A skid steer or tractor box blade can finish in an afternoon, so include the machine in the budget.

Example: a 100-foot farm lane

One hundred by ten feet at 6 inches comes to 1,000 x 0.5 = 500 cubic feet = 18.5 cubic yards, about 28 tons, or 30-31 with the allowance. Expect two tandem loads, and set up two drop points along the route instead of one mountain at the gate. Farm lanes are often the calculator's largest average orders, and splitting the drops can mean spreading downhill rather than moving material uphill.

Pads for RVs, containers, and equipment

Use the lane calculation for pads, but select depth by axle load rather than the calendar. A 12 x 40 RV pad at 6 inches compacted requires about 12 tons. A 20 x 40 equipment yard at 8 inches needs 27. Because shipping containers place weight on four corners, container pads need a full 8 inches plus fabric even on decent ground, or those corners can leave signatures in the pad by spring.

Using crushed concrete for road base

Recycled concrete base can compact and support loads much like virgin road base, often at a lower cost. Check county specifications before making the switch, since some require virgin aggregate. It can be a sensible choice for private pads and lanes. The math remains unchanged: 1.5 tons per yard, the same lifts, and the same crown.

Road base by ton and lane

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