Package inputs (outer box, inches & oz)

in
in
in
oz

Fee data: Amazon 2026 US rate card (small standard $2.43–$2.95, large standard $2.91–$6.93, bulky from $6.78, special from $194.18), 3.5% fuel surcharge effective 2026-04-17. Verified October 2026.

Result

Current size tier—
Fulfillment fee (incl. fuel)—
Billed weight—
Next cheaper tier—
Fee if you drop a tier—
Saving per unit—
Enter your box dimensions and weight, then hit Optimize.
How the tier rules work (2026)
  • Small standard-size: longest ≤ 15 in, second ≤ 12 in, shortest ≤ 0.75 in, weight ≤ 1 lb. Fee $2.43–$2.95.
  • Large standard-size: longest ≤ 18 in, second ≤ 14 in, shortest ≤ 8 in, weight ≤ 20 lb. Fee $2.91–$6.93 (3 lb top bracket) or $6.15 + $0.08/4 oz above 3 lb.
  • Small / medium / large bulky: up to 108 in longest, girth up to 165 in, weight up to 150 lb. Fee from $6.78 / $8.58 + $0.38 per lb above 1 lb.
  • Special / extra-large: beyond the above, from $194.18.
  • Non-small-standard packages bill on the greater of actual weight and dimensional weight (L×W×H ÷ 139 for US).
Packaging tips to drop a tier
  • Cut the shortest side under 0.75 in (poly mailer instead of a box) to qualify as small standard.
  • Keep the longest side under 18 in and shortest under 8 in to stay large standard.
  • Remove void fill: shrink the box volume to lower dimensional weight even inside the same tier.
  • Watch the weight brackets — trimming 1–2 oz can drop a full fee step within a tier.
Pair with the full workflow: use the FBA Profit Calculator to see the real profit impact of your tier, or the ACoS Calculator to check ad profitability on the trimmed unit. Full fee schedules: FBA Fees 2026 Table.
What are the Amazon FBA size tiers in 2026?

Amazon sorts packages into small standard-size (longest side up to 15 in, second up to 12 in, third up to 0.75 in, under 1 lb), large standard-size (up to 18/14/8 in, under 20 lb), small bulky (up to 60 in longest, 30 in second, girth up to 130 in, under 70 lb), medium bulky (up to 108 in, girth 130 in), large bulky (girth 165 in) and special/extra-large bulky. Fulfillment fees rise with each tier.

How much can I save by dropping an FBA size tier?

Fulfillment fee differences between adjacent tiers are typically $0.38–$0.93 per unit on standard sizes, and much larger when crossing from standard to bulky (from $2.43–$6.93 standard vs $6.78+ bulky). Example: a 3 lb large-standard unit at $5.85 vs the same unit in a lower weight bracket at $5.44 saves $0.41/unit — over $4,920/year at 1,000 monthly sales.

What counts as a small standard-size FBA package?

A small standard-size package has a longest side up to 15 inches, second-longest side up to 12 inches, shortest side up to 0.75 inches, and weight under 1 lb. Its 2026 fulfillment fee ranges from $2.43 (2 oz) to $2.95 (16 oz) before the 3.5% fuel surcharge.

Does dimensional weight affect my FBA size tier?

For non-small-standard sizes, Amazon bills the greater of actual weight and dimensional weight (length × width × height ÷ 139 in inches for US). A light but large box can be charged by dimensional weight, pushing the effective fee up even inside the same tier — so trimming box volume matters for cost even without changing tiers.

How do I reduce my FBA fulfillment fee?

Drop to a lower size tier by shrinking the box (cut the shortest side under 0.75 in to reach small standard, or keep longest side under 18 in), reduce weight under the next weight bracket, and cut empty space to lower dimensional weight. Each bracket you drop saves roughly $0.38–$0.93 per unit.

Not affiliated with Amazon. As an Amazon Associate I earn from qualifying purchases. This report was generated on fbacalcs.com — tool results are estimates for planning, not Amazon quotes. No data ever leaves your device.