Shipping is typically the second or third largest operational expense for e-commerce businesses, after product cost and sometimes marketing. Unlike marketing, shipping costs compound — every order you fulfill has a shipping cost attached. Reducing that cost by 15-20% across all shipments has a significant impact on margin. Here’s how to do it with EasyPost and WooCommerce.
Understand How Carriers Price Shipments
Before optimizing, understand what you’re optimizing against. Carriers price shipments based on:
- Actual weight — the physical weight of the package
- Dimensional weight (DIM weight) — calculated as (L × W × H) ÷ DIM factor. Carriers charge whichever is higher.
- Zone — distance between origin and destination ZIP codes. Zone 1 is nearby; Zone 8 is cross-country.
- Service level — ground vs. express vs. priority
- Surcharges — residential delivery, fuel surcharge, oversized, signature required
The two biggest levers are reducing DIM weight (using right-sized boxes) and choosing the cheapest carrier+service for each shipment.
Strategy 1: Use the Smallest Box That Fits
DIM weight is calculated from your box dimensions, not your product dimensions. A small product in a large box pays large-box DIM weight pricing. Using right-sized boxes consistently reduces DIM weight charges — often by 20-30% for lightweight products in standard packaging.
The TheForge EasyPost Shipping plugin includes a 3D bin packing algorithm that automatically selects the smallest box from your configured box sizes for each order. This isn’t just about efficiency — it’s a direct cost reduction mechanism.
Strategy 2: Compare Rates Across Carriers Automatically
EasyPost’s core value proposition is multi-carrier rate comparison. For every shipment, EasyPost returns rates from every carrier your account has access to — USPS, UPS, FedEx, DHL, and more — ranked by price. The cheapest option for a 2lb package going to Zone 3 might be USPS Ground Advantage one week and UPS Ground the next, depending on fuel surcharges and zone pricing.
Manual carrier comparison is impractical at scale. EasyPost does it automatically, and the shipping plugin surfaces the lowest rate at checkout and in the order management screen.
Strategy 3: USPS Commercial Pricing
EasyPost accounts get access to USPS Commercial pricing (also called Commercial Base Pricing or CBP) — rates that are significantly lower than retail Post Office prices. For USPS Priority Mail, commercial rates are typically 15-25% lower than retail. For USPS Ground Advantage (formerly First Class and Retail Ground), commercial rates make it competitive with UPS and FedEx Ground for packages under 1lb.
This pricing is included in your EasyPost account at no additional cost and applied automatically to every USPS rate request.
Strategy 4: UPS and FedEx Negotiated Rates
If you ship significant volume with UPS or FedEx (50+ packages/week), you’re eligible for negotiated rates directly with the carrier. These can be 30-50% below published rates for high-volume shippers. EasyPost supports importing your negotiated rates via carrier accounts, so the plugin automatically uses your discount rates when calculating and purchasing labels.
Strategy 5: Flat Rate Shipping for Predictable Products
For products with consistent dimensions and weight, USPS flat rate packaging eliminates zone-based pricing entirely. A USPS Priority Mail flat rate box ships anywhere in the US for the same price regardless of weight (up to 70lbs) or destination.
The plugin lets you configure flat rate rules — for example, “if order weight is under 5lbs and fits in a flat rate envelope, use USPS Priority Mail flat rate.” Applied to the right products, this simplifies pricing and reduces cost for zone-heavy destinations.
Strategy 6: Reduce Surcharges
Surcharges add up. Common avoidable surcharges:
- Residential delivery — unavoidable for B2C but factor it into rate comparison
- Address correction — eliminated by address validation at checkout (the plugin handles this)
- Oversize — avoidable by choosing the right packaging; know each carrier’s oversize thresholds
- Signature required — only add when genuinely necessary; it adds $4-6 per package
Strategy 7: Automate to Eliminate Fulfillment Overhead
Labor cost is a shipping cost. Manual label printing — finding the order, choosing a carrier, printing the label, updating tracking — takes 2-5 minutes per order. At 50 orders/day, that’s 2-4 hours of fulfillment time daily.
The TheForge EasyPost Shipping plugin includes automation rules that purchase labels automatically when orders are paid — choosing the right carrier, the right service, and applying your box configuration without manual intervention. Bulk label printing handles the rest. Your team focuses on picking and packing, not on shipping software.
Putting It Together
The compounding effect of these strategies is significant. Right-sized boxes reduce DIM weight by 20%. Carrier comparison finds the cheapest option for each shipment. Commercial pricing reduces USPS costs by 15-25%. Address validation eliminates correction surcharges. Automation eliminates fulfillment labor time.
Applied together, stores typically reduce their per-shipment cost by 20-35% compared to manual carrier accounts and retail pricing.
Ready to get started? Get the TheForge EasyPost Shipping plugin or talk to our team about your specific shipping setup.