Road base calculator for Utah

At 100 feet long and 10 feet wide, a lane built to 6 inches compacted takes about 31 tons of road base. Long runs can use more aggregate than expected, making free delivery especially useful when 30 tons of freight can nearly match the material cost. Road base is graded crushed stone with fines, about 3,000 lb per cubic yard, which compacts into a dense foundation for equipment yards, driveways, and roads. Recycled crushed concrete base follows the same calculation when the specification permits it.

Lane quantities

1. For lanes, take the length along the center and calculate from the average width. Pad area is simply length multiplied by width.
2. For light residential areas, compact to 4 inches. Use 6 for daily traffic and delivery trucks, or 8-12 where subgrades are soft or equipment will sit.
3. Take cubic feet ÷ 27 to find yards; multiply by 1.5 for tons; include +10% for compaction.

Coverage and lane quantities

Build a lane for the next winter

• Remove organic material before placing stone. If base goes over topsoil, mud can push up through it regardless of how much stone is added.
• Lay woven geotextile first on wet or soft subgrade, then add stone. It adds support beneath a lane at low cost.
• Place and roll lifts no deeper than 4 inches before adding the next layer.
• Build in a 2-3% slope from the center toward both sides, allowing rain to run off at the edges rather than enter the base.
• For a tidy, lower-dust driving surface, finish with #57 or driveway gravel.
• Handling 20-plus tons by hand can consume a week. With a tractor box blade or skid steer, the spreading can take an afternoon, so include the machine in your budget.

Example: a 100-foot farm lane

For one hundred by ten feet at 6 inches, 1,000 x 0.5 = 500 cubic feet = 18.5 cubic yards, about 28 tons, or 30-31 after the allowance. It comes in two tandem loads, so arrange two unloading spots along the route instead of leaving one pile at the entrance. Farm lanes tend to create the largest typical calculator orders, and using two drops avoids moving material uphill after spreading it downhill.

Equipment, container, and RV pads

Use the same method for pads, but choose depth based on axle weight rather than the calendar. An RV pad measuring 12 x 40 at 6 inches compacted takes about 12 tons. An equipment yard at 20 x 40 and 8 inches takes 27 tons. Because shipping containers place their load on four corners, use a full 8 inches plus fabric for container pads, even where ground seems decent, to limit settling by spring.

Crushed concrete road base

Recycled concrete base can compact and handle loads about as well as virgin road base, often at a lower cost. Check county specifications before making the change, since some call for virgin aggregate. It is a practical choice for private lanes and pads. Use the same math: 1.5 tons per yard, identical lifts, and the same crown.

Road base by ton or lane

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