How Much Road Base for 100 Square Feet?
How much road base for 100 square feet depends on depth. At 6 inches you need about 1.85 cubic yards, roughly 2.8 tons at 1.5 tons per yard. At 4 inches the order drops to 1.9 tons.
Volume and tonnage calculator →Road base for 100 sq ft by depth
| Depth | Cubic yards | Tons | Tons +10% |
|---|---|---|---|
| 4 in | 1.23 | 1.9 | 2.0 |
| 6 in | 1.85 | 2.8 | 3.1 |
| 8 in | 2.47 | 3.7 | 4.1 |
Working it out
- 100 sq ft × (6 ÷ 12) ft = 50.0 cubic feet.
- ÷ 27 = 1.85 cubic yards.
- × 1.5 tons per yard = 2.8 tons.
About road base
Road base is meant to be compacted at close to the right moisture. Dry base rock does not lock up well; a light spray of water before rolling helps. Most suppliers will quote 1.4 to 1.65 compacted tons per yard for this material.
Before the truck comes
- Measure odd shapes in pieces. Split curves and L-shapes into rectangles and add them.
- Add a margin. About 10 percent covers compaction and low spots.
- Bulk or bags. Bulk delivery is the practical choice here.
- Prep first. Remove sod, compact the subgrade and set edging before the stone arrives.
Use the volume and tonnage calculator for any other size.
Where road base fits
Works well for:
- Base under asphalt and concrete
- Gravel roads and drives
- Equipment and shed pads
Poor fit for:
- Drainage layers
- Decorative surfaces
- Surfaces that will stay uncompacted
Quick reference numbers
- Per inch over 100 sq ft: about 0.46 tons of road base (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.6 tons.
- Another size for comparison: a 15x30 area at 2 inches takes about 4.2 tons.
- Weight used here: about 1.5 tons per cubic yard.
Common estimating mistakes
- Skipping drainage. Water sitting under any surface softens the base and leads to ruts and potholes.
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
- Assuming every supplier uses the same weight. Two yards selling the same product name can quote different tons per yard.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
Questions people ask
How many tons of road base for 100 square feet?
About 2.8 tons at 6 inches deep.
How many cubic yards of road base for 100 square feet?
About 1.85 yards at 6 inches.
How much road base for 100 square feet at 4 inches?
About 1.9 tons, or 1.23 cubic yards.
How much does a yard of road base weigh?
About 1.4 to 1.65 compacted tons.
Should I add extra?
Yes, about 10 percent is a common allowance.
Related guides
- Crushed Stone vs Gravel: Differences and Best Uses
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Much Does a Ton of Gravel Cover? Depth Chart
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