Which shipping carrier is cheapest?

It depends on weight and size. USPS is cheapest for under 1 lb (First-Class: $3–5). UPS and FedEx compete for 2–50 lb ground shipments ($8–30). DHL is often cheapest for international. For most e-commerce sellers, a multi-carrier strategy saves 10–20% vs using a single carrier.

How do carrier rates differ?

Rates differ by: base rate structure, DIM divisor (USPS 166, UPS/FedEx 139), zone pricing, residential surcharges ($4–6 for UPS/FedEx), and volume discounts. USPS doesn't charge residential surcharges, making it cheaper for B2C shipments under 10 lbs.

What are shipping zones?

Zones represent distance from origin to destination, numbered 1–8 (9 for some carriers). Zone 1 is local (same area), Zone 8 is coast-to-coast. Higher zones cost more. All carriers use similar zone maps. USPS zones affect Priority and Ground Advantage; First-Class is zone-independent.

Should I use one carrier or multiple?

Multi-carrier strategies save 10–20%. Use USPS for lightweight packages under 1 lb. Use UPS or FedEx Ground for heavier packages. Use DHL for international. Shipping platforms (ShipStation, Pirate Ship, EasyPost) make multi-carrier shipping simple with rate shopping.

How can I get lower carrier rates?

Ship more volume (carriers offer tiers at 50, 200, 500+ packages/week), use third-party postage platforms (Pirate Ship, ShipStation get pre-negotiated USPS rates), negotiate directly with UPS/FedEx using competitor quotes, and consolidate to fewer carriers for volume leverage. These changes usually reduce cost over time.

Are these rates accurate?

These are estimated rates based on publicly available pricing. Actual rates vary by your negotiated discounts, surcharges (residential, extended area, peak), fuel surcharges (11–15% for UPS/FedEx), and special handling. Use these as directional guidance and get actual quotes from carriers.

Carrier Comparison Calculator

Compare shipping rates across USPS, UPS, FedEx, and DHL side-by-side. Enter package weight and dimensions to see estimated costs by carrier and service level.

Weight

lbs

Length

Width

Height

Zone

Carrier	DIM Weight	Billable	Estimated Rate
USPS ✅	5.8 lbs	5.8 lbs	$11.46
UPS	6.9 lbs	6.9 lbs	$14.87
FedEx	6.9 lbs	6.9 lbs	$14.45
DHL	6.9 lbs	6.9 lbs	$18.04

Cheapest Carrier

USPS

For ground service

Savings vs Most Expensive

$6.58

Per package

Planning notes, formulas, and examples

About the Carrier Comparison Calculator

The Carrier Comparison Calculator lets you compare estimated shipping rates from USPS, UPS, FedEx, and DHL side by side based on package weight and service level. Carrier pricing varies significantly — USPS is often cheapest for lightweight packages under 1 lb, while UPS and FedEx compete for 2–50 lb packages, and DHL often wins for international shipments.

Rather than checking four carrier websites separately, this calculator shows estimated rates for standard, expedited, and express services from all major carriers in a single comparison table. The models use publicly available base rate structures and typical discounts.

Note: actual rates vary by account negotiation, shipping volume, origin/destination, and surcharges. Use this as a directional comparison to decide which carriers deserve a live quote for that shipment profile.

When This Page Helps

Stop checking four carrier sites one by one. This page shows side-by-side rate direction by service level so you can narrow the carrier choice before you buy a label.

How to Use the Inputs

Enter the package weight in pounds.
Enter the package dimensions (length, width, height).
Select the shipping zone (1–8).
View the comparison table showing rates by carrier and service.
The cheapest option for each service tier is highlighted.
Use results to guide carrier negotiations.

Formula used

Rate = Base Rate + Weight Surcharge + Zone Adjustment
DIM Weight = (L × W × H) / DIM Factor
Billable Weight = max(Actual Weight, DIM Weight)
Each carrier uses different DIM factors: USPS 166, UPS 139, FedEx 139, DHL 139

Example Calculation

Result: USPS: $12.30 | UPS: $14.75 | FedEx: $14.20 | DHL: $18.50

For a 5 lb package (12×10×8 in) to zone 5: DIM weight is 960/139 = 6.9 lb for UPS/FedEx (billable: 6.9 lb) and 960/166 = 5.8 lb for USPS (billable: 5.8 lb). USPS Priority Mail is cheapest at $12.30. FedEx Ground edges out UPS Ground by $0.55. DHL is most expensive for domestic ground.

Tips & Best Practices

USPS is usually cheapest for packages under 1 lb (First-Class Package).
UPS and FedEx are competitive for 2–70 lb ground shipments.
Always compare DIM weight — carriers with larger DIM factors (USPS 166) charge less for bulky, lightweight items.
Negotiate rates with your primary carrier using competitor quotes as leverage.
Regional carriers (OnTrac, LaserShip, Spee-Dee) can be 15–30% cheaper for specific zones.
Consider a multi-carrier strategy: use USPS for lightweight, UPS for heavy, FedEx for time-sensitive.

Choosing the Right Carrier

No single carrier is cheapest for every shipment. The optimal carrier depends on weight, size, distance, speed, and your negotiated rates. Most high-volume sellers use 2–3 carriers to get the best rate for each shipment. Shipping platforms like ShipStation, Pirate Ship, and EasyPost provide rate shopping across carriers.

Understanding DIM Weight

Dimensional weight often costs more than actual weight. A 2 lb box measuring 18×12×12 has a DIM weight of 18.7 lb at UPS/FedEx (DIM factor 139) and 15.7 lb at USPS (DIM factor 166). That difference means USPS charges for 15.7 lb while UPS charges for 18.7 lb, a significant rate gap.

Negotiating Carrier Rates

With 50+ packages per week, you can negotiate 15–40% discounts. Start by getting quotes from all four carriers. Use the lowest quote as leverage with your preferred carrier. Key areas to negotiate: per-package rates, DIM factor increases, residential surcharge reductions, and peak season surcharge caps.

Sources & Methodology

Last updated: February 8, 2026

Frequently Asked Questions

It depends on weight and size. USPS is cheapest for under 1 lb (First-Class: $3–5). UPS and FedEx compete for 2–50 lb ground shipments ($8–30). DHL is often cheapest for international. For most e-commerce sellers, a multi-carrier strategy saves 10–20% vs using a single carrier.