How Much Gravel Do I Need? Easy Calculation Guide
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One of the most common questions we get is “how much gravel do I need?” Over-ordering wastes money, and under-ordering means a second delivery charge. Here’s how to get it right the first time.
The Basic Formula
The calculation is straightforward:
Length (ft) × Width (ft) × Depth (ft) ÷ 27 = Cubic Yards
The ÷ 27 converts cubic feet to cubic yards, which is how gravel is sold.
Example: Standard Driveway
A driveway that is 40 feet long, 12 feet wide, with 3 inches of gravel:
- 40 × 12 × 0.25 = 120 cubic feet
- 120 ÷ 27 = 4.44 cubic yards
- Round up to 5 cubic yards
Always round up — it’s better to have a small amount left over than to come up short.
Common Project Calculations
Driveway (Single Car)
- Typical size: 30 ft × 10 ft × 4 in deep
- Calculation: 30 × 10 × 0.33 ÷ 27 = 3.7 yards (order 4)
Driveway (Double Car)
- Typical size: 40 ft × 18 ft × 4 in deep
- Calculation: 40 × 18 × 0.33 ÷ 27 = 8.8 yards (order 9–10)
Garden Pathway
- Typical size: 20 ft × 3 ft × 2 in deep
- Calculation: 20 × 3 × 0.17 ÷ 27 = 0.38 yards (order 0.5)
Patio Base
- Typical size: 12 ft × 12 ft × 4 in deep
- Calculation: 12 × 12 × 0.33 ÷ 27 = 1.8 yards (order 2)
French Drain
- Typical size: 30 ft × 1 ft × 1.5 ft deep
- Calculation: 30 × 1 × 1.5 ÷ 27 = 1.7 yards (order 2)
Converting Depth to Feet
Since depth is usually measured in inches, here are the conversions:
| Inches | Feet |
|---|---|
| 1 in | 0.083 ft |
| 2 in | 0.167 ft |
| 3 in | 0.25 ft |
| 4 in | 0.33 ft |
| 6 in | 0.5 ft |
| 12 in | 1.0 ft |
Weight Estimates
Gravel typically weighs 2,800–3,000 pounds per cubic yard (about 1.4–1.5 tons). This is important for:
- Ensuring your vehicle can handle the weight if you’re picking up
- Understanding delivery requirements
- Planning for equipment needs (a wheelbarrow holds about 0.06 cubic yards)
Pro Tips for Accurate Estimates
- Add 10% extra for irregular shapes, compaction, and settling
- Measure twice before ordering — delivery charges apply per trip
- Consider depth carefully — driveways need 4+ inches, pathways need only 2–3 inches
- Account for the base layer if you’re building from scratch — you’ll need larger stone underneath
Skip the Math
Don’t want to do the calculations yourself? Use our gravel calculator — just enter your dimensions and we’ll tell you exactly how much you need, with pricing included.
Ready to order? Browse our products to find the right material for your project.