ShippingCowSFP for Oversize and Extra Large items: the two-day math, and how many warehouses you need
SFP for big items is decided by the two-day promise, not the one-day promise. An Extra Large SKU (50 lb and up, a side of 96 in or more, or 130 in length plus girth) must show a two-day delivery date on at least 25% of Prime page views and a five-day date on at least 60%, with no one-day target. Reaching 25% is a warehouse-coverage problem: one West Coast warehouse reaches about 16–24% of US buyers in two ground days and can miss the bar, while both coasts reach 51–81% and adding a Texas node reaches 66–98% (modeled).
The three tiers and their page-view targets
| Tier | 1-day target | 2-day target | 5-day target |
|---|---|---|---|
| Standard | 40% | 75% | 90% |
| Oversize | 15% | 45% | 80% |
| Extra Large (50 lb and up) | Not listed | 25% | 60% |
Reported figures, reproduced from PPC Land (May 26, 2026), the Amazon notice reposted on Sellers Ask Sellers (May 21, 2026) and SellerSprite (Aug 1, 2026). Amazon's Seller Central policy pages need a login, so treat each number as reported until you confirm it in your account. Extra Large means 50 lb and up, a side of 96 in or more, or 130 in length plus girth (any one of the three).
The two-day math: how many warehouses you need
The Extra Large bar is a two-day bar: at least 25% of Prime page views must show a two-day delivery date. How many of your buyers a warehouse can reach in two ground days decides whether one node is enough. Here is the modeled two-day reach, with Census population standing in for page views:
| Coverage | Two-day reach (modeled) | Clears the 25% bar? |
|---|---|---|
| One East Coast warehouse | 35–57% | Yes |
| One West Coast warehouse | 16–24% | No, can miss it |
| Both coasts | 51–81% | Yes |
| Coasts plus Texas | 66–98% | Yes |
Method: straight-line distance from the warehouse to every US ZIP, matched to published UPS ground transit maps, with Census population as a stand-in for Prime page views. Checked Oct 13, 2026.
Read the model as a range, not a quote
One West Coast warehouse can miss the Extra Large 25% bar, because 16–24% sits under 25%. The targets count the promise shown on the page, which depends on where stock sits, your cut-off and your weekend days, not the actual delivery.
Treat these numbers as modeled, not carrier-quoted. Real routes follow roads and hubs, not straight lines. Page views are not population. And parcels of 50 lb and up carry Additional Handling or Large Package status, where UPS says time guarantees do not apply, so heavy parcels can run slower than the map. Alaska, Hawaii and Puerto Rico are not in the model.
Weekends count from October 18, 2026
Amazon excludes weekend page views from the speed metric until October 17, 2026, and counts them from October 18, 2026 (reported by PPC Land, May 26, 2026, and Sellers Ask Sellers, May 21, 2026).
SFP requires at least one weekend operating day (Saturday or Sunday). Sunday counts as that day only if a carrier actually scans the parcel on Sunday. There is no generally available Sunday pickup for parcels of 50 lb and up, so a Sunday-packed order without a Sunday scan misses the ship date. For heavy parcels, Saturday is the safer weekend day.
The full SFP rulebook is in the Amazon SFP 3PL guide.
What to do this week
Check your page-view promise by ZIP. Amazon's delivery-promise tool estimates the promise from your ship-from locations, cut-off and weekend days, so the same SKU can show different promises in different ZIPs.
Map where your stock actually sits. One node on each coast is the difference between roughly 16–24% and 51–81% two-day reach.
Check your cut-off and weekend days. Sources report a weekday cut-off no earlier than 2 PM local (unconfirmed); choose one weekend day a carrier will actually scan.
Run the SFP readiness check at /tools/sfp-readiness and see your ZIP's two-day reach next to the 25% bar.
See your own number
The two-day math above is a model, not a quote. For your real numbers, send 30 recent shipments for a Cost Audit, and you see what you pay today next to what you would pay with ShippingCow, by weight, including where we would cost you more.
Sources
| Source | What we took from it |
|---|---|
| PPC Land: Amazon tightens Seller Fulfilled Prime speed rules starting July 6 | May 26, 2026. The tier targets, Extra Large including 50 lb and up, and the weekend exclusion ending Oct 17, 2026 |
| Sellers Ask Sellers: Updated Seller Fulfilled Prime requirements | May 21, 2026. The Amazon notice reposted: tier percentages, and that 25% of Prime page views must show a two-day date |
| SellerSprite: Amazon Seller Fulfilled Prime 2026 | Aug 1, 2026. The per-ZIP promise uses your ship-from locations; the weekend exclusion is removed after the grace period |
| Amazon Seller Central: SFP weekend operations | Read Oct 11, 2026. Saturday or Sunday may be enabled; Sunday counts only with a carrier scan that day |
| Two-day ground coverage model (this site) | Checked Oct 13, 2026. Straight-line distance to every US ZIP, matched to published UPS ground maps, with Census population as a stand-in for page views |
Checked Oct 13, 2026. Amazon's Seller Central policy pages need a login, so the tier numbers above are reproduced from the three secondary sources listed, and should be confirmed in your own account.
Questions
Which SFP tier is my 60 lb product in? +
Extra Large. Amazon's Extra Large tier covers items of 50 lb and up, a side of 96 in or more, or 130 in length plus girth (any one of the three; PPC Land, May 26, 2026).
Does my big item need a one-day delivery promise? +
No. Extra Large has no one-day target. You need a two-day delivery date on at least 25% of Prime page views and a five-day date on at least 60%.
Can one warehouse pass the Extra Large two-day bar? +
It depends where it sits. One East Coast warehouse reaches roughly 35–57% of US buyers in two ground days and clears the 25% bar; one West Coast warehouse reaches about 16–24% and can miss it (modeled).
Is the two-day promise the same as a two-day delivery? +
No. The target counts the delivery date Amazon shows on the page, set by where stock sits, your cut-off and your weekend days, not whether the parcel actually arrives in two days.
Do I have to ship on weekends for SFP? +
You must operate at least one weekend day, Saturday or Sunday. Sunday counts only if a carrier scans the parcel that day, and there is no generally available Sunday pickup for parcels 50 lb and up, so Saturday is the safer choice.
How do I check my two-day reach before I enroll? +
Check your page-view promise by ZIP in Amazon's delivery-promise tool, then run the SFP readiness check at /tools/sfp-readiness to see your ZIP's two-day reach next to the 25% bar.
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