A tri-axle dump truck holds 10-16 cubic yards of material.
A standard tri-axle dump truck typically carries 10-16 cubic yards of loose material like gravel, sand, or dirt, depending on weight limits and material density. Capacity varies by truck design, local regulations, and load type (e.g., lighter materials allow for more volume). Always confirm with load calculations.
Factors Affecting Tri-Axle Dump Truck Capacity
- Material Type: Light materials (mulch, topsoil) max out volume (~16 yd³). Heavy materials (gravel, wet clay) may limit capacity (~10-12 yd³).
- Weight Limits: Legal road weight restrictions (often ~50,000-80,000 lbs total) reduce volume for dense loads.
- Truck Design: Side height, bed length, and axle configuration influence capacity. Some trucks prioritize weight over volume.
- Local Regulations: State/provincial laws may enforce stricter weight or volume limits.
Tri-Axle vs. Other Dump Truck Sizes
| Truck Type | Cubic Yards Capacity | Typical Load Weight | Best For |
|---|---|---|---|
| Single-Axle | 3-5 yd³ | Up to 10,000 lbs | Small projects, tight spaces |
| Tandem-Axle | 7-10 yd³ | 20,000-30,000 lbs | Residential/medium jobs |
| Tri-Axle | 10-16 yd³ | 30,000-50,000 lbs | Commercial, heavy materials |
| Super Dump (6+ Axles) | 18-25 yd³ | 50,000-80,000 lbs | Large-scale construction |
How to Calculate Your Load
- Determine Material Density: Check lbs/yd³ (e.g., gravel = ~2,800 lbs/yd³; topsoil = ~2,000 lbs/yd³).
- Weigh the Truck: Subtract empty weight from gross weight to find usable load capacity.
- Convert to Yards:
- Example: 40,000 lbs capacity ÷ 2,500 lbs/yd³ (sand) = 16 yd³ max.
- For gravel: 40,000 lbs ÷ 2,800 lbs/yd³ = ~14 yd³.
Common Materials & Estimated Yards per Tri-Axle Load
- Topsoil: 14-16 yd³ (light, fluffy)
- Sand (dry): 12-15 yd³
- Gravel (crushed stone): 10-13 yd³
- Concrete (broken): 8-10 yd³ (dense, heavy)
- Mulch: 15-16 yd³ (very light)
Safety & Legal Considerations
- Overloading Risks: Fines, truck damage, or accidents. Never exceed gross vehicle weight rating (GVWR).
- Permits: Some areas require permits for oversize/overweight loads.
- Tarp Laws: Many regions mandate covering loose materials to prevent spillage.
- Axle Weight Limits: Distribute load evenly to avoid exceeding per-axle limits (often ~20,000 lbs/axle).