Road Base Calculator · Tonnage, Volume & Cost Estimator for Road Base Material

Road Base Calculator

Estimate road base tonnage, volume, and cost for driveways, roads, and parking lots. Choose from crusher run, #304, #411, DGA, MOT Type 1, and recycled concrete aggregate with metric or imperial units.

Unit system
Project setup
Area is calculated from your shape dimensions. For irregular areas, split the project into rectangles, triangles, or trapezoids, calculate each separately, and add the results. A waste allowance is included below to cover spillage, uneven subgrade, and compaction loss.
Road base specifications
in
%
kg/m³
Compacted density is the mass per unit volume of road base after rolling. Crusher run compacts to about 2,200 kg/m³ (137 lb/ft³). #304 and #411 (Ohio DOT specs) compact to about 2,200 to 2,400 kg/m³. MOT Type 1 is the UK's standard sub-base at about 2,200 kg/m³. RCA is slightly lighter at about 2,000 kg/m³. The waste factor typically ranges from 5% to 15% to cover spillage, uneven subgrade, and compaction loss.
Cost estimate (optional)
$ / ton
Cost per ton varies by region, road base type, and project size. Typical ranges: $25 to $55 per US ton for crusher run, $30 to $60 per US ton for MOT Type 1, and $15 to $35 per US ton for recycled concrete aggregate. Leave at 0 to skip the cost estimate.
Road Base Estimate Result
Total Road Base Required
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- area - depth - volume
💚-
Surface area
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Volume (compacted)
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Road base weight
-
With waste allowance
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Dimension summary
DimensionValueMetric equivalentImperial equivalent
Volume conversions
UnitCompacted volumeWith wasteNotes
Weight conversions
UnitCompacted weightWith wasteNotes
Truckload estimate
Truck capacityPayload per loadLoads requiredNotes
Full project summary
MetricValueNotes
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Ordering road base is a weight game. Suppliers sell by the ton, but you measure your project in feet and inches. The conversion between the two depends on the aggregate’s compacted density, and that number shifts depending on whether you’re pouring crusher run, MOT Type 1, or recycled concrete. This calculator handles the conversion and adds a waste allowance so you’re not short. It supports rectangular, circular, triangular, and trapezoidal areas, which covers most driveway approaches, parking pads, and road segments. Enter your shape dimensions, set your compacted depth, pick your material, and the tool returns tonnage, volume, and optional material cost.

 

How to Use the Road Base Calculator

  1. Choose your unit system. Imperial uses feet and US tons; metric uses metres and tonnes.

  2. Select your project shape. Rectangle covers most driveways and parking pads.

  3. Enter your shape dimensions in feet, metres, or yards.

  4. Set your compacted depth. Six inches is a reasonable starting point for a residential driveway.

  5. Pick your depth unit if you measured in millimetres or centimetres instead of inches.

  6. Choose your road base type. The density field auto-fills based on your selection.

  7. Set a waste allowance. Ten percent is standard; go to 15% on uneven subgrade.

  8. Enter a price per ton if you want a material cost estimate. Leave at zero to skip.

 

How the Road Base Calculator Formula Works

The calculator converts your area and depth into compacted volume, then multiplies by density to get weight.

Formula: Weight = Area × Depth × Density × (1 + Waste%)

Area calculation depends on your shape selection. A rectangle uses length × width. A circle uses π × (diameter ÷ 2)². A triangle uses 0.5 × base × height. A trapezoid uses 0.5 × (top base + bottom base) × height.

Formula: Rectangle Area = Length × Width

Formula: Circle Area = π × (Diameter ÷ 2)²

Formula: Triangle Area = 0.5 × Base × Height

Formula: Trapezoid Area = 0.5 × (Top Base + Bottom Base) × Height

Density is the conversion factor between volume and weight, and it varies by material. Crusher run compacts to roughly 2,200 kg/m³ (137 lb/ft³). MOT Type 1 is similar at around 2,200 kg/m³ (137 lb/ft³). RCA is lighter at about 2,000 kg/m³ (125 lb/ft³). The calculator stores these values and applies the right one based on your dropdown selection. If you pick “Custom density,” the field unlocks and accepts your own value.

The waste factor covers spillage, uneven subgrade, and the difference between loose delivered volume and compacted in-place volume. A 10% allowance means you order 10% more than the compacted volume calculation suggests.

Worked Example

You’re building a driveway approach that’s 48 feet long and 14 feet wide. The subgrade is firm clay, so you’re laying a 6-inch compacted base of crusher run. Waste allowance is 12%. Crusher run costs $28 per US ton delivered.

Step 1 : Area. 48 × 14 = 672 sq ft.

Step 2 : Depth in feet. 6 inches ÷ 12 = 0.5 ft.

Step 3 : Compacted volume. 672 × 0.5 = 336 ft³. Divide by 27: 12.44 yd³.

Step 4 : Weight without waste. 336 ft³ × 137 lb/ft³ = 46,032 lb. Divide by 2,000: 23.02 US tons.

Step 5 : Weight with waste. 23.02 × 1.12 = 25.78 US tons.

Step 6 : Material cost. 25.78 × $28 = $721.84.

Step 7 : Truckloads. A standard dump truck carries 12 to 15 tons. 25.78 ÷ 15 = 1.72, so two loads.

That’s roughly $1.07 per square foot for material. For a driveway approach on firm ground with a proper 6-inch base, that’s a normal figure.

 

Annotated sketch of a 48-foot by 14-foot driveway approach showing a 6-inch compacted crusher run base.

How Deep Should a Road Base Be?

For residential driveways carrying passenger vehicles, 4 to 6 inches of compacted base is the minimum. On soft ground or for driveways that see heavy trucks, push to 8 or 10 inches. Commercial roads and parking lots often specify 10 to 12 inches in two lifts. The calculator lets you test different depths and see how tonnage changes. Dropping from 8 inches to 6 inches cuts base volume by 25%.

The depth figure that matters is compacted depth, not loose depth. You’ll order more material than the finished volume suggests because compaction squeezes air out.

Crusher Run vs Recycled Concrete Aggregate: What’s the Difference?

Crusher run is quarried stone crushed to a dense gradation; recycled concrete aggregate is processed demolition concrete with similar gradation but lower density and higher variability.

DimensionCrusher RunRecycled Concrete Aggregate (RCA)
SourceQuarried limestone, granite, or trap rockDemolition concrete, crushed and screened
Compacted density2,100–2,400 kg/m³ (131–150 lb/ft³)1,900–2,100 kg/m³ (119–131 lb/ft³)
Typical cost per US ton$25–$40$10–$20
Compaction behaviorPredictable, consistent gradationVariable; depends on source concrete
DrainageModerate; fines limit flowModerate to good; depends on fines content
Best useStructural base under asphalt or concreteDriveway base, parking pads, fill
AvailabilityQuarry-dependentUrban areas with demolition activity

Crusher run wins when consistency matters. The gradation is controlled at the quarry, the density is predictable, and it performs the same batch to batch. For a base under asphalt or a driveway that sees heavy loads, crusher run is the safer specification.

RCA wins on cost and sustainability. At roughly half the price per ton, it’s a legitimate option for large fills where the structural demand is lower. A gravel driveway base or a parking pad on firm ground is a good fit. The trade-off is variability, one load might have more brick or mortar than the next, which changes compaction behavior.

Frequently Asked Questions

How much road base do I need for a driveway?

Measure length and width, multiply by compacted depth in feet, then multiply by density. For a 40 ft × 12 ft driveway with a 6-inch base of crusher run, you’ll need about 16 tons before waste. Add 10% and you’re ordering roughly 18 tons. The calculator handles the conversion from your dimensions to tonnage in one step.

 

How deep should a road base be?

Four to six inches compacted is the minimum for residential driveways on firm ground. Go to 8 or 10 inches on soft soil or for driveways that see heavy trucks. Commercial roads and parking lots often specify 10 to 12 inches. The depth that matters is compacted depth, not loose depth.

 

What’s the cheapest road base material?

Recycled concrete aggregate (RCA) is usually the cheapest at $10 to $20 per US ton in markets where it’s available. Crusher run runs $25 to $40 per ton. RCA performs well as a driveway base and costs roughly half as much as quarried stone. The trade-off is variability, gradation shifts from load to load.

 

How many tons of road base in a cubic yard?

It depends on the material. Crusher run weighs about 1.35 to 1.5 US tons per cubic yard. RCA is lighter at roughly 1.1 to 1.2 tons per cubic yard. MOT Type 1 sits around 1.4 to 1.5 tons per cubic yard. The calculator uses density presets to convert between volume and weight, so you don’t need to look these up.

 

Can I use road base under pavers?

Yes, and it’s the standard practice. Pavers sit on a compacted aggregate base, typically 4 to 6 inches deep for patios and walkways and 6 to 10 inches for driveways. MOT Type 1 is the UK specification; crusher run or #304 is the US equivalent. The base must be compacted in lifts and leveled before the bedding sand goes down.

 

What is the difference between #304 and #411 gravel?

Both are Ohio DOT specifications for aggregate base. #304 is a coarser gradation, typically 1.5 inches down to dust. #411 is finer, with a top size of 1 inch. Both compact well. #411 is often used as a leveling course over #304 because the finer gradation makes it easier to grade smooth. The calculator lists both with their own density presets.

 

How much does road base cost per ton?

Crusher run runs $25 to $40 per US ton delivered in most US markets. RCA is $10 to $20 per ton. MOT Type 1 in the UK runs £25 to £45 per tonne. Decorative or specialty aggregates cost more. Delivery distance and order size both affect the final price.

 

Does road base need to be compacted?

Yes. Loose road base has roughly 70% of the density of compacted material. Without compaction, the base will settle unevenly under load and the surface above it will crack or rut. Best practice is to place in 4 to 6-inch lifts and compact each lift with a roller or plate compactor before adding the next.

Disclaimer

This calculator estimates road base material quantities for planning purposes. Actual requirements depend on subgrade conditions, compaction methods, and supplier-specific aggregate densities. Verify quantities with your supplier before ordering. The tool does not model drainage, slope stability, or geotextile requirements, those need a site assessment or a conversation with a civil engineer.

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