USPS · UPS · FedEx · Rate Comparison
Carriers charge by whichever is greater: actual weight or dimensional weight.
| Carrier | DIM Divisor | Formula |
|---|---|---|
| USPS | 166 | L × W × H ÷ 166 |
| UPS | 139 | L × W × H ÷ 139 |
| FedEx | 139 | L × W × H ÷ 139 |
| Tip | Savings |
|---|---|
| Use USPS for packages under 1 lb | 50-70% cheaper than UPS/FedEx |
| Use flat rate boxes when possible | Predictable cost, no weight calc |
| Print labels online (Pirateship, Shippo) | 20-40% off retail counter rates |
| Negotiate rates at 50+ shipments/mo | 10-30% volume discount |
| Consider regional carriers for local | LSO, OnTrac can be cheaper |
| Optimize box size to reduce DIM weight | Right-size packaging saves $$ |
| Box | Size | Price (2024) |
|---|---|---|
| Small Flat Rate | 8.6 × 5.4 × 1.6" | $10.20 |
| Medium Flat Rate | 11 × 8.5 × 5.5" | $17.10 |
| Large Flat Rate | 12 × 12 × 5.5" | $22.45 |
| Padded Flat Rate | 12.5 × 9.5" | $10.20 |