Amazon FBA Large Standard Fees at 4 oz vs 8 oz vs 12 oz

A 12 oz Large Standard unit is not a heavier Small Standard fee. Once the carton leaves the 15″ × 12″ × 0.75″ envelope, the 2026 $10–$50 card uses the Large Standard ounce ladder: $3.73 at 4 oz, $3.95 at 8 oz, $4.20 at 12 oz — then the 3.5% fuel surcharge multiplies the cell.

Type 0.25 lb, 0.50 lb, then 0.75 lb into the Amazon FBA Calculator on the default $29.99 Home & Kitchen listing with Large Standard selected. The fulfillment row is the only line that should move. The ounce ladder that still fits Small Standard is Amazon FBA fees at 4 oz vs 8 oz vs 16 oz. The pound cells from 1.00 lb up are Amazon FBA fees at 1 lb vs 2 lb vs 3 lb.

Three ounce cells after you leave the 0.75″ envelope

Large Standard is the FBA tier for packaged units up to 18″ × 14″ × 8″ and 20 lb that no longer fit Small Standard. Inside that tier the 2026 US card still charges by shipping weight — 4 oz steps up to 1 lb, then quarter-pound steps. Price band is a second axis: this page stays in the $10–$50 column because $29.99 and $14.99 both sit there. Under $10 and over $50 use the other two numbers in the same amazon.ts row.

Large Standard · $10–$50 card · base fulfillment (before 3.5% fuel)

Shipping weight	Base FBA	After fuel	Dataset cell
4 oz (0.25 lb)	$3.73	$3.86	`upTo4oz.mid`
8 oz (0.50 lb)	$3.95	$4.09	`upTo8oz.mid`
12 oz (0.75 lb)	$4.20	$4.35	`upTo12oz.mid`
16 oz / 1.00 lb	$4.60	$4.76	`upTo16oz.mid` · next page starts here

Cells are amazon.ts fbaFulfillmentFees.largeStandard, last verified 2026-10-01. Fuel is fuelSurchargeMultiplier (1.035). Apparel and DG cards are not in this file — verify those SKUs in Seller Central.

The expensive decision on a light unit is usually the size tier, not the next 4 oz. Same 4 oz shipping weight on Small Standard is $3.42 ($3.54 after fuel) versus $3.73 ($3.86 after fuel) on Large Standard — $0.32 on a $29.99 listing. That gap is a thickness or length miss, not a heavier product. If the packed unit still fits 15″ × 12″ × 0.75″, this table does not apply.

SKU A: $29.99, calculator defaults, only ounces change

SKU A is the calculator’s default Home & Kitchen listing: $29.99, $8.00 COGS, $1.00 inbound, 0.25 cu ft, one off-peak month of storage ($0.78/cu ft → $0.20). Referral stays 15% ($4.50; the $0.30 minimum is not binding). Storage is held constant so the table isolates the fulfillment jump — a real 12 oz box is often larger than 0.25 cu ft; re-enter your cube in the tool.

Home & Kitchen, $29.99, Large Standard. Fulfillment rises $0.49 from 4 oz to 12 oz; profit falls by the same amount because referral, storage, inbound, and COGS are unchanged. Scroll sideways on small screens.

SKU A · Home & Kitchen · $29.99 · $8.00 COGS · $1.00 inbound · 0.25 cu ft × $0.78

Weight	Referral (15%)	FBA + fuel	Storage	Profit / unit	Margin
4 oz	$4.50	$3.86	$0.20	$12.44	41.5% · healthy
8 oz	$4.50	$4.09	$0.20	$12.21	40.7% · healthy
12 oz	$4.50	$4.35	$0.20	$11.95	39.8% · healthy

Profit = price − referral − FBA − storage − inbound − COGS. Reproduce the three rows in the calculator with Large Standard + Home & Kitchen + $29.99. The 8 → 12 oz step ($0.26) is close to 4 → 8 oz ($0.23). Same 4 oz weight on Small Standard would keep $12.76 leftover — only if the carton still fits the envelope.

On this mid-ticket SKU the 12 oz version is still 39.8% · healthy. The ounce steps are a packaging trim, not a kill switch: $0.49 per unit is what a 4 oz redesign is worth before you spend it on a new insert. Getting back into Small Standard is the larger lever ($0.32 on the 4 oz pair).

SKU B: $14.99 / $8 COGS — 4 oz already loses

Same Large Standard ounce path, tighter contribution. $14.99 still sits in the $10–$50 fulfillment column, so the FBA cells are identical to SKU A. Referral is 15% of the lower sticker ($2.25). COGS stays $8.00. The 4 oz cell is already below zero.

SKU B · Home & Kitchen · $14.99 · $8.00 COGS · same inbound and storage

Weight	Referral (15%)	FBA + fuel	Profit / unit	Margin
4 oz	$2.25	$3.86	-$0.31	-2.1% · loss
8 oz	$2.25	$4.09	-$0.54	-3.6% · loss
12 oz	$2.25	$4.35	-$0.80	-5.3% · loss

Same calculator path as SKU A: change price to $14.99 and cost to $8.00, then step the weight. 4 oz is already -2.1% · loss; 12 oz is -5.3% · loss.

If A, a 12 oz inbound on the $29.99 / $8.00 SKU still clears 39.8% — cut ounces when the carton project is cheaper than $0.49 per unit, or spend the bigger budget on returning to Small Standard if that $0.32 gap is real. If B, do not send the Large Standard version at $14.99 / $8.00: the 4 oz row is already -$0.31 per unit. Raise the sticker, cut COGS, or drop the SKU. Volume does not fix a negative unit.

If A, trim the carton / if B, do not inbound

The rule is not “light products are cheap to fulfill.” It is two forks on the same Large Standard ounce card — re-run your own price, COGS, cube, and size tier in the calculator before you copy the dollars.

If leftover after 15% referral, COGS, inbound, and storage still clears 25% at 12 oz (SKU A) — inbound is fine. Spend the packaging budget only when a real path to 4 oz, or back into the 0.75″ Small Standard envelope, is cheaper than $0.49 / $0.32 per unit. Do not chase Small Standard unless the box also fits 15″ × 12″ × 0.75″; that size-tier walkthrough is Amazon FBA fees at 4 oz vs 8 oz vs 16 oz.
If leftover is already negative at 4 oz (SKU B) — stop. The 8 oz and 12 oz cells add $0.23 and $0.49 more fulfillment on the same sticker, and the 4 oz row is already -$0.31. Re-price or re-source before the first inbound. Peak storage ($2.40/cu ft in Q4 vs $0.78 off-peak) is a separate lever on Amazon Q4 2026 prep.

Comparing the same SKU on another marketplace is the Marketplace Fee Comparison Calculator, not this ounce table. The 3.5% fuel line that sits on every cell is already inside the calculator’s fulfillment row.

How to run the number this week

Open the Amazon FBA Calculator. Set Large Standard, Home & Kitchen (or your real category), your COGS and inbound, and January–September storage unless the unit will sit into Q4.
Enter the live list price. Set weight to the packed shipping weight Amazon will use (the greater of actual and dimensional), in pounds — 4 oz is 0.25, 8 oz is 0.50, 12 oz is 0.75. Write down Net profit / unit. On SKU A those three figures are $12.44, $12.21, and $11.95.
If you change cartons often, watch the live dimensional-weight line and the size tier Amazon assigned, not the factory spec. Helium 10 ^* is the research suite we already link from the calculator; Sellerboard ^* is the per-SKU settlement view. Neither changes the fee card.
Confirm the 4 / 8 / 12 oz row in Seller Central’s Revenue Calculator before you lock a packaging redesign. This page follows amazon.ts (https://sellercentral.amazon.com/help/hub/reference/external/G201411300). Apparel and dangerous-goods cards are outside this file. The 1.00 lb cell and the pound ladder above it are Amazon FBA fees at 1 lb vs 2 lb vs 3 lb. Extra-Large 0–50 lb is Amazon FBA Extra-Large fees.

Frequently asked questions

How much does Amazon FBA charge for a Large Standard unit under 1 lb?

On the 2026 Large Standard $10–$50 card the ounce cells are $3.73 at 4 oz, $3.95 at 8 oz, and $4.20 at 12 oz. After the 3.5% fuel surcharge those become $3.86, $4.09, and $4.35 — $0.49 more fulfillment from 4 oz to 12 oz on the same selling price. The 16 oz / 1.00 lb cell is $4.60 ($4.76 after fuel). Apparel and dangerous-goods cards are separate. Verify the live cell in Seller Central’s Revenue Calculator.

When does a light unit leave Small Standard and pay these Large Standard cells?

Small Standard is only for packaged units that stay inside 15″ × 12″ × 0.75″ and 16 oz. A 4 oz kit in a 1″ mailer is already Large Standard, so it uses $3.73 instead of the Small Standard 4 oz cell ($3.42 on the same $10–$50 card) — $0.31 before fuel, $0.32 after on a $29.99 listing. If the carton still fits the envelope, stop using this page and open Amazon FBA fees at 4 oz vs 8 oz vs 16 oz. Confirm the size tier Amazon assigned the ASIN; do not guess from unit weight alone.

How do I reproduce the 4 oz / 8 oz / 12 oz table in the calculator?

Open the Amazon FBA Calculator. Leave the defaults: $29.99 price, $8.00 cost, Home & Kitchen, Large Standard, $1.00 inbound, January–September storage, 0.25 cu ft, 1 month. Set weight to 0.25 lb (4 oz), then 0.50 lb (8 oz), then 0.75 lb (12 oz). Net profit / unit should match $12.44, $12.21, and $11.95. The 1.00 lb / 16 oz cell on the same path is $11.54.

Does crossing 12 oz to 16 oz change the Large Standard fee?

Yes. This dataset bills 12 oz on $4.20 and 16 oz / 1.00 lb on $4.60 — a $0.40 base step, $0.41 after fuel on a $29.99 listing. Anything above 1.00 lb leaves this ounce ladder for the quarter-pound cells on Amazon FBA fees at 1 lb vs 2 lb vs 3 lb. Confirm dimensional weight if the box is light but large; Amazon bills the greater of actual and dimensional weight.

Does the 3.5% fuel surcharge change between 4 oz and 12 oz?

The rate does not. The 3.5% fuel & logistics surcharge (effective 2026-04-17) multiplies whichever Large Standard cell you land on. Heavier units pay more dollars of surcharge because the base is higher — $0.15 on the 12 oz cell versus $0.13 on the 4 oz cell in this example — but it is the same multiplier. The calculator’s fulfillment row already includes it.