Why Use This Gravel & Aggregate Calculator?
Whether installing a new gravel driveway, landscape drainage trench, patio base, or walkway, ordering aggregate by weight or volume can be confusing. Landscape yards quote prices either per cubic yard or per ton. Because different aggregates vary significantly in density—from lightweight pea gravel to heavy decomposed granite—this calculator accurately converts volume into tons and adds compaction overage so you never run short.
Gravel & Aggregate Formulas
\[\text{Depth (ft)} = \frac{\text{Depth (in)}}{12}\] \[\text{Net Volume (cu ft)} = \text{Area (sq ft)} \times \text{Depth (ft)}\] \[\text{Total Volume with Waste (cu ft)} = \text{Net Volume (cu ft)} \times \left(1 + \frac{\text{Waste \%}}{100}\right)\] \[\text{Cubic Yards} = \frac{\text{Total Volume (cu ft)}}{27}\] \[\text{Tons} = \frac{\text{Cubic Yards} \times \text{Density (lbs/cu yd)}}{2000}\] \[\text{Total Cost} = \text{Tons} \times \text{Price Per Ton}\]Gravel Coverage Reference Table (Crushed Stone ~1.35 Tons/yd³, $45/Ton)
| Area & Depth | Volume (cu ft) | Total Volume (+10% Waste) | Weight in Tons | Coverage per Ton | Total Cost |
|---|---|---|---|---|---|
| 100 sq ft @ 2 in depth | 16.67 cu ft | 0.68 cu yds | 0.92 Tons | 109 sq ft / ton | $41.40 |
| 300 sq ft @ 3 in depth | 75.00 cu ft | 3.06 cu yds | 4.13 Tons | 73 sq ft / ton | $185.85 |
| 500 sq ft @ 4 in depth | 166.67 cu ft | 6.79 cu yds | 9.17 Tons | 55 sq ft / ton | $412.65 |
| 1,000 sq ft @ 4 in depth | 333.33 cu ft | 13.58 cu yds | 18.33 Tons | 55 sq ft / ton | $824.85 |
Step-by-Step Guide: How to Calculate Gravel Orders
- Calculate Area: Multiply length by width of your excavation bed to find total square feet.
- Determine Layer Thickness: Use 2 inches for flower beds, 3 inches for footpaths, and 4 to 6 inches for driveways.
- Select Aggregate Material: Choose crushed stone for compaction or pea gravel for decorative footpaths.
- Order by Ton or Yard: Supply your quarry or landscape supplier with total tons or cubic yards.
Frequently Asked Questions
How many tons of gravel are in a cubic yard?
One cubic yard of crushed gravel weighs approximately 1.35 tons (2,700 lbs), while pea gravel weighs ~1.30 tons and decomposed granite weighs ~1.50 tons.
How many square feet does a ton of gravel cover at 3 inches depth?
One ton of crushed stone (approx. 0.74 cubic yards) covers roughly 80 square feet at a depth of 3 inches.
How thick should a gravel driveway be?
A gravel driveway should have a total depth of 4 to 6 inches, typically consisting of a 3-inch subbase of heavy crushed stone topped with 2 inches of decorative gravel.
Why do I need to add a compaction factor to gravel calculations?
When gravel is spread and compacted with a plate compactor or driven over, its volume decreases by 10% to 15% as smaller stones settle into air gaps.
How much does a yard of gravel cost?
Bulk gravel costs between $35 and $65 per cubic yard ($40 to $75 per ton), depending on material type and local quarry proximity.
What is the difference between pea gravel and crushed stone?
Pea gravel consists of naturally rounded, smooth river stones ideal for pathways, whereas crushed stone has sharp angular edges that interlock tightly for stable driveways.
Is my personal data saved?
No. All calculations run locally in your web browser.