Question 1

What is Inventory Hero’s fulfillment fee calculator?

Accepted Answer

Inventory Hero’s free fulfillment fee calculator lets Amazon and TikTok Shop sellers instantly compare FBA and Fulfilled by TikTok (FBT) costs side by side. Enter your product’s dimensions, weight, and selling price, and Inventory Hero shows the exact fulfillment fee, cumulative storage cost, and grand total for both platforms. Inventory Hero updates all rates whenever Amazon or TikTok publishes new fee schedules.

Question 2

How are Amazon FBA fulfillment fees calculated in 2026?

Accepted Answer

Amazon FBA fulfillment fees depend on two things: size tier and shipping weight. Inventory Hero classifies products into five size tiers (Small Standard, Large Standard, Small Bulky, Large Bulky, and Extra-Large) using Amazon's official dimension and weight limits. Shipping weight is the greater of unit weight or dimensional weight (L x W x H / 139), except Small Standard which uses unit weight only. Starting January 15, 2026, Amazon introduced price-banded rates: items under $10, $10 to $50, and over $50 each have different fee schedules. Inventory Hero applies the correct band automatically based on your item price. See Amazon's official size tier definitions (https://sellercentral.amazon.com/help/hub/reference/external/G201105770) and fulfillment fee schedule (https://sellercentral.amazon.com/help/hub/reference/external/GABBX6GZPA8MSZGW) for full details.

Question 3

How does Inventory Hero calculate TikTok Shop fulfillment fees?

Accepted Answer

TikTok Shop (Fulfilled by TikTok) uses a base-plus-weight model. The 2026 base fee is $3.58 for a single item up to 1 lb, plus $1.70 for each additional pound. Multi-unit orders get per-unit discounts: $2.86 for 2-item orders, $2.65 for 3, and $2.35 for 4 or more. TikTok uses a dimensional weight divisor of 166 (compared to Amazon’s 139), so the same product may have a lower billing weight on TikTok. Inventory Hero calculates billing weight, applies the correct single or multi-unit rate, and shows the result alongside the Amazon FBA fee so you can compare instantly. See TikTok’s official Fulfilled by TikTok fee page (https://seller-us.tiktok.com/university/essay?knowledge_id=3507056320268087) for the full rate card.

Question 4

How does dimensional weight work for Amazon FBA vs TikTok Shop?

Accepted Answer

Dimensional weight estimates how much space a package occupies relative to its actual weight. The formula is L × W × H (in inches) divided by a platform-specific divisor. Amazon FBA uses a divisor of 139; TikTok Shop uses 166. The billing weight is whichever is greater: actual weight or dimensional weight. One exception: Amazon’s Small Standard tier uses unit weight only (no dim weight). Because TikTok’s divisor is larger, the same box produces a lower dimensional weight on TikTok, which can mean lower fees for lightweight, bulky products. Inventory Hero calculates both dimensional weights automatically and shows you the billing weight each platform will charge.

Question 5

What are Amazon FBA storage fees and how does Inventory Hero calculate them?

Accepted Answer

Amazon FBA charges monthly storage fees per cubic foot. Rates are seasonal: Off-Peak (January through September) is $0.87/cu ft for standard-size and $0.56/cu ft for oversize; Peak (October through December) jumps to $2.40/cu ft and $1.40/cu ft respectively. Inventory Hero's calculator lets you specify both a storage start month and the number of months stored. It then iterates month by month, applying the correct seasonal rate for each month (including wrap-around from December to January), and sums the total per-unit storage cost across the full period. This cumulative approach gives you a realistic storage estimate, not just a single-month snapshot.

Question 6

How does TikTok Shop storage pricing work?

Accepted Answer

TikTok Shop storage is charged daily per cubic foot, with tiered rates based on how long inventory has been stored. The first 60 days are completely free. Days 61 to 90 cost $0.017/cu ft/day (2026 rate), days 91 to 180 cost $0.045/cu ft/day, and days 181 and beyond cost $0.09/cu ft/day. Inventory Hero's calculator walks through these tiers for your specified storage duration, calculating the exact overlap between your storage period and each pricing bracket to give you a precise cumulative cost. For example, 3 months (90 days) means 60 free days plus 30 days at $0.017.

Question 7

What changed in Amazon FBA fees for 2026 vs 2025?

Accepted Answer

The biggest 2026 change is price-banded fulfillment fees. Before January 15, 2026, Amazon charged a single rate per size tier and weight bracket. After that date, fees vary by item selling price: under $10, $10 to $50, and over $50. Items priced under $10 generally see lower fulfillment fees, while items over $50 pay slightly more. Storage rates and size-tier definitions remain the same. Inventory Hero lets you toggle between 2025 Peak and 2026 Price-Banded rates so you can see the impact on your specific products.

Question 8

Is Inventory Hero’s fee calculator accurate and up to date?

Accepted Answer

Yes. Inventory Hero’s calculator is built directly from the official Amazon Seller Central fee schedule (https://sellercentral.amazon.com/help/hub/reference/external/GABBX6GZPA8MSZGW) and TikTok Shop’s Fulfilled by TikTok rate card (https://seller-us.tiktok.com/university/essay?knowledge_id=3507056320268087). The 2026 Amazon FBA rates (effective January 15, 2026) include all price-banded tiers, and the TikTok rates reflect the latest published schedule. We monitor both platforms for fee updates and push changes as soon as new rate cards are announced. All calculation logic is covered by automated tests to ensure accuracy.

Question 9

How can I use Inventory Hero to decide between Amazon FBA and TikTok Shop?

Accepted Answer

Enter your product’s length, width, height, weight, and selling price into Inventory Hero’s calculator. Set the number of units you plan to ship and how many months you expect to store them. Inventory Hero instantly shows per-unit fulfillment fees, cumulative storage costs, and a grand total for both Amazon FBA and TikTok Shop. The side-by-side comparison table highlights which platform is cheaper and by how much. Use the pricing period toggle to see how fees changed between 2025 and 2026. For sellers listing on both marketplaces, Inventory Hero makes it easy to see exactly where each product is most profitable.

Question 10

Where can I find the official Amazon FBA and TikTok Shop fee schedules?

Accepted Answer

Amazon publishes FBA fulfillment fee rates at https://sellercentral.amazon.com/help/hub/reference/external/GABBX6GZPA8MSZGW and size tier definitions at https://sellercentral.amazon.com/help/hub/reference/external/G201105770. TikTok Shop’s Fulfilled by TikTok fees are published at https://seller-us.tiktok.com/university/essay?knowledge_id=3507056320268087. Inventory Hero’s calculator is built directly from these sources and is updated whenever new rates are announced.

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