No carrier is cheaper than another in every case. USPS bills actual weight on most domestic services, UPS bills the greater of actual and dimensional weight, and the point where that difference flips the cheaper option depends on the box, the weight and the destination zone. These 12 comparisons work out where each flip sits.
USPS vs UPS vs FedEx: Where the Cheaper Carrier Flips
Head-to-head carrier comparisons that name the weight, zone or box size at which the answer changes, rather than crowning one carrier overall.
- 12Head-to-head comparisons
- USPS and UPSCarriers you can buy here
Three variables decide almost every carrier flip on this site: the package's weight, the zone it is traveling to, and whether the box counts as dimensional.
Each square is one package: a billed weight, read across to the zone it ships to. The figure is how much less the lower service charges for that label, never a price. The tint deepens with the gap in four steps, scaled within each run, so the widest USPS lead and the widest UPS lead both read darkest.
Read one square 10 lb to zone 6: USPS Ground Advantage $20.99, UPS® Ground $21.19. USPS is $0.20 less, the figure in the ringed square.
-
Weight
On the map: the flip, between 20 and 30 lb.
Weight alone rarely settles it, because a service that is cheaper at one weight can lose at the next weight break, and a service that wins to a nearby zone can lose to a coast-to-coast one. Reading a single headline price and assuming it holds for every shipment is the mistake these comparisons exist to correct.
-
The box
On the map: dimensional weight moves a big, light box down to a heavier row.
Dimensional weight is the variable that surprises the most sellers, because it is billed on the box, not the contents. UPS and FedEx bill the greater of actual weight and a volume-based weight, calculated from the box's length, width, and height, on the package services the rule applies to, which covers the ground and express services most sellers use. USPS applies that same volume-based calculation only to qualifying Priority Mail Express, Priority Mail, Ground Advantage, and Parcel Select packages over one cubic foot addressed to Zones 1 through 9, which means a light item in a right-sized small box can dodge the charge on USPS while the identical item in an oversized box cannot. The box, not the carrier relationship, is usually the first thing worth checking.
-
Zone
On the map: at 10 lb USPS is lower to zones 2 to 7 and UPS is lower to zone 8. Here the zone changes the winner, not only the size of the gap.
Zone is the other half of the answer, and it is easy to under-price because a seller usually tests a rate to one destination and assumes it holds everywhere. The same package can be the cheaper USPS option to a nearby zone and the cheaper UPS option to a distant one, because the two carriers' zone-based pricing curves do not rise at the same rate. Checking the zone for your highest-volume destinations, rather than a single test shipment, is what keeps a routing rule accurate as your customer base spreads out.
12 comparisons, grouped by the two carriers they weigh.
The ones between two USPS services are grouped as Within USPS.
Each comparison below names the two options being weighed and states where the flip happens, so the page can be used as a lookup rather than read end to end. If your package matches the weight, zone, or box size described, the flip point is the number that decides your label. I'd Ship That rate-shops USPS and UPS on every order and, with Ship Intelligence (Pro), applies the cheaper valid option automatically once you would rather stop checking by hand.
Pick the comparison that matches the two options you are actually choosing between. If you have already chosen a carrier and only need its price table, go to the rate guides instead.
I'd Ship That prints discounted USPS and UPS labels. FedEx appears in several of these comparisons because sellers compare against it, and those pages are reference material: FedEx is not sold through I'd Ship That.
Within USPS
3 comparisons- USPS Ground Advantage vs Priority Mail Turns on the deadline: inside three days Ground Advantage the default: costs less on every package Priority Mail a deadline inside three days, or coast to coast When the Priority Mail upgrade is worth paying for, and when 2-5 days is enough
- USPS Flat Rate vs Weight-Based: Break-Even Weight Turns on the zone: far zones, heavy items Flat Rate heavy, dense items to far zones Weight-based light packages and near zones The break-even weight where a flat rate box stops saving you money
- USPS Media Mail vs Ground Advantage: Eligibility Turns on contents: qualifying media only Media Mail qualifying media, more so as weight grows Ground Advantage anything that is not strictly media When Media Mail eligibility is worth the savings, and when it is a postage-due risk
USPS vs UPS
4 comparisons- USPS vs UPS: Where the Cheaper Carrier Flips Turns on the box: light for its size USPS a box that is light for its size UPS a dense, heavy box to a far zone Where dimensional weight and cubic pricing flip the cheaper carrier
- USPS vs UPS Small Packages Under 1 lb Turns on weight: under 1 lb USPS nearly every package under 1 lb UPS only once weight or size clears its floor Where sub-pound USPS pricing beats the UPS® Ground floor, and where cubic wins
- USPS vs UPS Heavy Packages Over 10 lb Turns on the box: one cubic foot USPS a dense box under one cubic foot UPS a large, light box to a far zone Where dimensional weight and girth flip the cheaper carrier on a big box
- USPS Ground Advantage vs UPS® Ground: Surcharges Turns on weight: 20 to 30 lb Ground Advantage light, residential, rural and PO Box parcels UPS® Ground dense boxes past roughly 20–30 lb to commercial addresses The surcharges that decide the two everyday ground services, shipment by shipment
USPS vs FedEx
3 comparisonsReference only- USPS vs FedEx: The Surcharge Stack That Doubles It Turns on fees: residential, delivery area, fuel USPS light residential parcels, with residential and fuel built in Why a FedEx Ground quote is not what a residential parcel actually costs
- USPS vs FedEx Overnight: Which Window You Need Turns on the clock: 8 AM, 10:30 AM or 6 PM USPS guaranteed by 6 PM in 1 to 3 days by lane, $12 to $55 less at 1 lb FedEx a package that must land by 8 AM or 10:30 AM Which overnight guarantee you are actually paying for, and when 6 PM is enough
- USPS vs FedEx for Ecommerce: Route by SKU Turns on weight: route each SKU by weight and cube USPS most SKUs, the sub-2 lb bulk of an order book FedEx can compete on compact heavy items to the farthest zones Route each SKU by weight and cube instead of standardizing on one carrier
UPS vs FedEx
2 comparisonsReference only- UPS vs FedEx: Surcharges Decide It, Not Base Rates Turns on fees: the surcharge schedule Tie base rates within $1–3, so surcharges decide USPS often beats both on a light, bulky residential parcel The surcharge structure, not the base gap of under $1, decides a UPS or FedEx invoice
- UPS® Ground vs FedEx Ground: the Fee Stack Turns on fees: the fee stack Tie base rates within $1–3, so the fee stack decides Either right-sizing the box saves more than switching Residential, delivery-area, fuel, and DIM decide a Ground bill, not the base-rate gap
Compare USPS and UPS Rates in One Place#
Get instant quotes from USPS and UPS side by side.
Create a label