A standard tri-axle dump truck holds 10-16 cubic yards of material.
Tri-axle dump trucks typically carry 10-16 cubic yards, depending on bed size, weight limits, and material density. Lighter materials (e.g., mulch) may max out volume, while heavier loads (e.g., gravel) hit weight restrictions first. Always confirm local regulations and truck specifications.
Key Factors Affecting Capacity
- Material type: Loose materials (topsoil, mulch) fill more volume; dense materials (sand, gravel) add weight faster.
- Truck bed dimensions: Standard beds range 14-18 feet long, with side heights of 4-6 feet.
- Weight limits: Legal road weight (often 40,000-54,000 lbs total) restricts heavy materials like wet clay or rock.
- Local laws: Axle configurations and permits may alter maximum allowable volume/weight.
Capacity by Common Materials
| Material | Cubic Yards (Approx.) | Weight per Yard (Lbs) | Max Safe Load (Tons) |
|---|---|---|---|
| Topsoil (dry) | 14-16 | 2,000-2,500 | 14-16 |
| Gravel (loose) | 10-12 | 2,800-3,000 | 14-15 |
| Sand (dry) | 9-11 | 2,700-3,000 | 13-15 |
| Mulch | 16-18 | 500-1,000 | 4-6 |
| Crushed Stone | 8-10 | 3,000-3,200 | 12-13 |
How to Calculate Your Load
- Measure the bed: Multiply length × width × height (in feet), then divide by 27 to get cubic yards.
- Check material density: Use lbs/yard for your material (e.g., gravel = ~2,900 lbs/yard).
- Weigh constraints: Subtract truck weight (~25,000 lbs empty) from legal gross weight (e.g., 54,000 lbs).
- Test load: For accuracy, load a partial batch and weigh at a certified scale.
Tri-Axle vs. Other Dump Trucks
| Truck Type | Cubic Yards | Axles | Best For | Weight Limit (Lbs) |
|---|---|---|---|---|
| Single-Axle | 3-5 | 1 | Small jobs, tight spaces | 10,000-15,000 |
| Tandem-Axle | 7-10 | 2 | Residential projects | 25,000-35,000 |
| Tri-Axle | 10-16 | 3 | Commercial, heavy materials | 40,000-54,000 |
| Quad-Axle | 14-18 | 4 | Large-scale construction | 50,000-60,000 |
Safety Tips for Loading
- Avoid overfilling-materials settle during transit, risking spillage or instability.
- Distribute weight evenly to prevent tipping, especially with uneven loads like boulders.
- Tarp loose materials (e.g., mulch, dirt) to comply with road debris laws.
- Recheck weight after loading-scales at quarries or landfills prevent overlimit fines.