Gravel Calculator — Cubic Yards & Tons Needed
Accurately estimate crushed stone, pea gravel, and river rock in both cubic yards and US tons (or cubic meters & metric tonnes) with compaction factors.
Project Inputs & Specs
Loose gravel compacts by 8-12% under plate compactor or vehicle tire rolling.
Gravel Quantity Required
Equivalent to 4.07 Cubic Yards
Order 6 Tons (or 4.5 Cu Yds) from Local Quarry
Dump truck deliveries typically range from 3-ton single-axle trucks up to 15-to-20-ton tri-axle loads. Quoting both tons and yards ensures clear communication with dispatchers.
Aggregate Volume & Density Tonnage Math
Gravel volume is computed in cubic feet, scaled for a 10% compaction settling buffer, and multiplied by material-specific density factors:
Volume (Cu Ft) = L(ft) × W(ft) × (Depth ÷ 12) × 1.10 | Cu Yds = Cu Ft ÷ 27 | Tons = Cu Yds × Density FactorStep-by-Step Step Rule:
- 1Measure the length and width of the project excavation area.
- 2Select your target depth (2" for refresh, 4" for standard paths, 6" for driveways).
- 3Choose your gravel aggregate type to apply the correct laboratory bulk density factor.
- 4Review dual output in cubic yards and scale tons for local supplier ordering.
How to Calculate Gravel in Tons and Cubic Yards: Complete Quarry Guide
Gravel ordering is one of the most common sources of contractor budget overruns. The discrepancy stems from the difference between volume (cubic yards) and scale weight (US tons or metric tonnes). Because aggregate rocks have varying pore densities and moisture contents, 1 cubic yard of gravel weighs between 2,700 and 3,100 lbs (1.35 to 1.55 US tons).
Bulk Aggregate Density & Tonnage Conversion Table
Quarries and weigh-stations bill in certified tons. Use this laboratory density conversion table:
| Gravel / Aggregate Type | Tons per Cu.Yd | Lbs per Cu.Ft | Primary Structural Use |
|---|---|---|---|
| Crushed Stone (#57 / 3/4" Angular) | 1.40 Tons | 104 lbs | Driveways, French drains, concrete sub-bases. |
| Pea Gravel (3/8" Smooth Rounded) | 1.50 Tons | 111 lbs | Garden walkways, dog runs, exposed aggregate concrete. |
| River Rock (1"-3" Decorative) | 1.35 Tons | 100 lbs | Dry creek beds, drainage swales, landscape borders. |
| Decomposed Granite (DG) | 1.55 Tons | 115 lbs | Tightly compacted rustic trails, bocce courts, tree surrounds. |
How to Layer a Permanent Gravel Driveway (The 3-Layer Method)
Pouring loose gravel directly over dirt results in mud sinkholes within 6 months. Commercial civil engineers build gravel driveways with three distinct layers:
- Subgrade Geotextile Fabric: Lay heavy-duty woven polypropylene ground fabric over excavated soil to prevent aggregate from sinking into the dirt while allowing moisture drainage.
- Base Course (4-6 inches): Install large, angular #3 or #4 crushed stone (1.5 to 2.5 inch stone) to establish heavy vehicular load bearing capacity.
- Surface Wearing Course (2-3 inches): Crown the center with #57 crushed limestone (3/4 inch with stone dust / crusher run) to pack tightly and channel rainwater into side ditches.
Quarry Hauling & Dump Truck Sizing
Aggregate haulers generally operate single-axle dump trucks (carrying 5 to 7 tons), tandem trucks (carrying 10 to 14 tons), and tri-axle trucks (carrying 18 to 22 tons). Always inspect overhead clearances for power lines and tree branches before the truck begins its hydraulic bed lift.
Frequently Asked Questions (FAQ)
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