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Crusher run calculator for Washington

Build a pavement-like base with crusher run, calculated for compacted depth rather than an estimate of loose material.

Enter your project dimensions

ft
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ft
Enter a width greater than 0
ft
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in
Enter a depth between 0.25 and 24 inches

Crusher run settles 10-15% from its loose truck volume during compaction. Ordering only for the measured depth can leave the finished base half an inch too shallow, so this calculator starts with a +10% allowance selected. You may see it listed as 1 1/4 Minus, CSBC in Washington, or 2 inch minus on some tickets. Each refers to crushed stone that retains its fines, about 3,000 lb per cubic yard, forming a firm surface that tires do not easily displace.

Order for compacted depth

  1. Find the footprint in feet: multiply lane length by width, or measure the pad sides.
  2. Choose the required finished compacted depth: 4 inches for paths and pavers, 4-6 for driveways, and 6-8 under trucks.
  3. For yards, divide cubic feet by 27. Multiply that result by 1.5 for tons, and leave the +10% selected. Specifications refer to rolled depth, not loose depth.
Tons = (Area sq ft × Compacted depth in ÷ 12) ÷ 27 × 1.5 × 1.10

Per-ton coverage

Compacted depth1 cubic yard covers1 ton covers
2 inches162 sq ft≈ 108 sq ft
4 inches81 sq ft≈ 54 sq ft
6 inches54 sq ft≈ 36 sq ft
8 inches41 sq ft≈ 27 sq ft

Best uses and limits

  • Driveway base: compact 4-6 inches, then place 2-3 inches of #57 or driveway gravel as the finished driving layer.
  • Budget rural lanes: use crusher run by itself for a drivable surface. Plan for dust in summer and regrading every 2-4 years.
  • Paver and slab base: compact 4 inches in 2-inch layers. Use the Paver Base Calculator for the entire paver stack.
  • Shed and hot-tub pads need 4 inches on stripped ground and 6 on soft soil.
  • Keep it out of a French drain. Its fines help it bind but also retain water, so drainage calls for clean #57 or drain rock.

Example: a 20 x 10 parking pad

For two hundred square feet at 4 inches compacted, calculate 200 x 0.333 = 67 cubic feet = 2.5 cubic yards, or 3.7 tons. With the allowance, order 4 tons. Place and compact half first, then add the remaining half and compact it. Two 2-inch lifts last longer than one 4-inch pour by years. A plate compactor rented for the afternoon costs less than repairing the first pothole. Ruts by the second delivery often show when compaction was skipped.

Delivery details

  • Schedule base and surface stone together in one delivery to keep the work moving. Delivery is free either way.
  • Have the load tipped at the end farthest from the start, then spread back toward it. On large pads, downhill work saves a full day over spreading uphill.
  • Lightly mist each layer before rolling it. Damp crusher run compacts tighter than dry material.
  • Set aside a wheelbarrow-load for touchups. Crusher run also works for pothole patches.

How pricing works

Crusher run is generally lower priced than washed, sorted stone because it comes from crusher output. The +10% allowance on a 4-ton order can prevent needing another half-ton delivery. Visit the Crusher Run product page for per-ton pricing, compare Road Base, and order both driveway layers in one free delivery.

Crusher run, 1 1/4 Minus, and CSBC FAQs

How much crusher run is needed for a driveway?
Calculate lane area by compacted depth (4-6 inches), convert using 1.5 tons per yard, then add 10%. For a 50 x 10 ft lane at 4 inches, the delivered amount is about 10 tons.
What does a yard of crusher run weigh?
One cubic yard weighs about 3,000 lb, or 1.5 tons, with a little added weight after rain. Fines occupy the gaps between the stones, making it heavier than clean gravel.
How do crusher run and gravel differ?
Crusher run includes stone dust, while gravel such as #57 is washed or screened clean. The dust creates a dense base; clean stone stays open for drainage and surface layers. Use them in that sequence for a driveway.
Are crush and run and crusher run identical?
They are the same material under regional names. 1 1/4 Minus, CSBC, and 2 inch minus fall in the same product family. Any name brings the same blend.
Can crusher run serve as the top surface?
Yes, for rural and low-traffic drives. It compacts into a solid crust that suits changing weather, but it creates dust during dry periods and needs regrading every few years. A later 2 inches of #57 addresses both.
How much will crusher run compact?
It compacts by Ten to fifteen percent. A loose 4-inch layer finishes at about 3.5 inches after rolling. That is why the calculator leaves its allowance on and why specifications state compacted depth.
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