Gravel Volume to Weight (Tons) Conversion Formulas
Aggregate material suppliers sell gravel and crushed rock by the ton weighed on truck scales, while excavations are measured in cubic yards or cubic meters:
Worked Example: 12 × 20 ft Driveway at 4 Inches Depth
For a standard single-car driveway parking pad (12 × 20 ft) with 4 inches of crushed stone base:
- Surface area: 12 × 20 = 240 sq ft
- Volume: 240 × (4 ÷ 12) = 80 cu ft (2.96 yd³)
- With 10% compaction & subbase settling = 88.0 cu ft (3.26 cubic yards)
- Crushed stone density (#57) = 1.40 tons per cubic yard
- Total weight: 3.26 × 1.40 = 4.56 US short tons (or ~183 bags of 50 lb)
- Bulk delivery recommendation: Order one 5-ton tandem dump truck load.
Gravel Tons & Cubic Yards by Area (2" and 4" Depth for 10×10, 12×20 Driveway, and 20×20 Slab Base)
Standard material estimates based on clean crushed stone (#57) @ 1.40 tons/yd³ with a 10% compaction allowance:
| Project Size & Application | Area (sq ft) | 2" Depth Volume (yd³) | 2" Depth Weight (Tons) | 4" Depth Volume (yd³) | 4" Depth Weight (Tons) |
|---|---|---|---|---|---|
| Small Patio Base (10 × 10 ft) | 100 sq ft | 0.68 yd³ (18 cu ft) | 0.95 tons (38 bags) | 1.36 yd³ (37 cu ft) | 1.90 tons (76 bags) |
| Walkway / French Drain (4 × 30 ft) | 120 sq ft | 0.81 yd³ (22 cu ft) | 1.14 tons (46 bags) | 1.63 yd³ (44 cu ft) | 2.28 tons (91 bags) |
| Single Car Driveway (12 × 20 ft) | 240 sq ft | 1.63 yd³ (44 cu ft) | 2.28 tons (Bulk) | 3.26 yd³ (88 cu ft) | 4.56 tons (Bulk) |
| Garage Apron (16 × 24 ft) | 384 sq ft | 2.61 yd³ (70 cu ft) | 3.65 tons (Bulk) | 5.21 yd³ (141 cu ft) | 7.30 tons (Bulk) |
| Two-Car Garage Base (20 × 20 ft) | 400 sq ft | 2.72 yd³ (73 cu ft) | 3.80 tons (Bulk) | 5.43 yd³ (147 cu ft) | 7.61 tons (Bulk) |
| Two-Car Driveway (20 × 30 ft) | 600 sq ft | 4.07 yd³ (110 cu ft) | 5.70 tons (Bulk) | 8.15 yd³ (220 cu ft) | 11.41 tons (Bulk) |
Note: Crushed stone compacts by 10% to 15% under a mechanical plate tamper. Always order 10% extra material to reach target finished grade.
Frequently Asked Questions
How many tons of gravel are in a cubic yard?
One cubic yard of standard crushed stone (#57 stone or 3/4-inch gravel) weighs approximately 1.40 US short tons (2,800 lbs). Pea gravel weighs approximately 1.35 tons per cubic yard (2,700 lbs), while dense-graded crusher run / limestone road base with fines weighs 1.45 tons per cubic yard (2,900 lbs).
How deep should gravel be for a patio, walkway, or driveway?
For garden paths and pedestrian walkways, a 2 to 3 inch depth is sufficient. For paver patios and concrete slab sub-bases, install 4 inches of compacted aggregate. For residential vehicle driveways, install a 6 to 8 inch compacted base in two separate lifts.
How many 50 lb bags of gravel make one ton?
There are exactly 40 fifty-pound (50 lb) bags in one US short ton (2,000 lbs). Because one cubic yard of gravel weighs approximately 1.4 tons, one cubic yard requires approximately 56 fifty-pound bags.
What is the difference between clean crushed stone and crusher run?
Clean crushed stone (#57) consists of uniform gravel washed free of stone dust, creating voids that provide excellent water drainage for French drains and retaining walls. Crusher run (dense grade aggregate) blends angular crushed stone with fine stone dust that packs tightly when rolled or vibrated to create a rigid, load-bearing driveway foundation.