FBA Fees, Storage, and Profit Calculator: How to Make Sure Your Wholesale Deals Are Really Profitable

For Amazon wholesale, it’s easy to fall in love with a product and forget the math. To protect your business, you must understand FBA fees, storage costs, and how to calculate real profit and ROI before you place an order.

How to Make Sure Your Wholesale Deals Are Really Profitable

The Main Types of Amazon FBA Fees

Before you run any calculation, know the basic fee types that affect your margin:

Referral fee: A percentage of the selling price, taken on every sale.
FBA fulfillment fee: Charged per unit for picking, packing, and shipping orders.
Storage fees: Monthly fees for inventory sitting in Amazon warehouses, plus possible surcharges or long‑term storage.
Optional/extra fees: Returns processing, removal/disposal, and special handling for certain categories.

Every serious pricing decision must factor in all of these, not just the FBA fee you see on the calculator.

Step‑by‑Step: How to Calculate Profit and ROI for a Product

Use this simple workflow whenever you analyze a wholesale product.

Collect your core numbers
- Selling price (Amazon Buy Box price).
- Supplier price per unit (your wholesale cost).
- Inbound shipping per unit (from supplier to Amazon or to you).
- Any prep/labeling/3PL cost per unit.
Use an FBA calculator
- Enter selling price, FBA fees, and referral fee.
- Add your total landed cost per unit (supplier + shipping + prep).
- The calculator will show net profit per unit, margin %, and ROI %.
Check your minimum thresholds
- Many wholesale sellers target at least 25–30% ROI and a healthy cash profit per unit.
- If the numbers are below your target, either negotiate a better price, raise your selling price, or skip the product.

Do this before every purchase order so you never buy stock that looks good but loses money on FBA.

How Storage Fees Affect Your Profit

Storage costs can quietly kill your profit if products sit too long.

Monthly storage: Charged per cubic foot of space your products occupy, with different rates by size and season.
Storage utilization surcharges: Extra fees if your inventory‑to‑sales ratio is high for a long time.
Long‑term storage fees: Additional charges for units that stay in FBA beyond certain time thresholds (for example 181+ days).

For fast‑moving wholesale products, storage is usually a small part of your costs, but for slow‑moving or bulky items, it can destroy your margin if you overstock.

Simple Example: Checking a Wholesale Deal

Here’s a basic example you can adapt in your own blog content.

Amazon selling price: 120 SAR
Supplier price: 55 SAR
Inbound shipping + prep: 5 SAR per unit
Total landed cost: 60 SAR
Referral + FBA fees (calculator): 30 SAR per unit

Result:

Net profit per unit: 120 − 60 − 30 = 30 SAR
ROI: profit ÷ cost of goods = 30 ÷ 60 = 50% ROI

If the product sells steadily and your storage time is short, this is a solid wholesale deal. If it sells very slowly and sits in storage, you must adjust for extra storage costs and maybe demand a better buy price.

Practical Rules to Keep Your Deals Safe

Use these rules to stay disciplined.

Always use the latest FBA fee tables or an updated calculator; fees can change year to year.
Include shipping, prep, and expected storage impact in your per‑unit cost.
Set a clear minimum ROI and margin and do not break your own rule just because you “like” a product.
Re‑check profitability whenever Amazon updates FBA fees or when Buy Box price changes.

This way, each new wholesale deal strengthens your business instead of adding hidden losses.

Work With Mahnoor LLC on Profit Analysis

If you want help building a simple but powerful spreadsheet or system to analyze FBA fees, storage, and ROI for your wholesale products, Mahnoor LLC can set it up with you. We focus on giving you clear buy/skip decisions so you protect your cash and grow smarter.

Learn more and book a consultation:
👉 Visit Mahnoor LLC (mahnoor.online)

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