FBA vs FBM: Which Is Actually More Profitable for Your Product?
There is no universal answer to FBA vs FBM — there's only your product's answer. The decision comes down to one comparison: net profit per unit under each model, with every cost included.
The Only Comparison That Matters
FBA net = price − referral − FBA fulfillment fee − product cost · FBM net = price − referral − your shipping − packaging/labor − product cost
The referral fee is identical in both models, so the real fight is FBA's fulfillment fee versus your own shipping + packaging + labor. Everything else is context.
Free FBA vs FBM Calculator — No Signup
Your price, your costs, both models side by side. See the per-unit winner instantly.
When Each Model Tends to Win
| Product profile | Usual winner | Why |
|---|---|---|
| Small, light, fast-selling | FBA | Low fulfillment fee, Prime badge, no daily labor |
| Heavy or oversized | FBM | FBA oversize fees often exceed self-ship cost |
| Slow mover / seasonal | FBM or hybrid | FBA storage + aged fees punish slow stock |
| Fragile / high-touch | FBM | You control packaging quality and damage rate |
The Costs Sellers Forget
- FBA side: monthly storage (triples in Q4), aged-inventory surcharge, inbound shipping to Amazon, prep fees
- FBM side: packaging materials, your time (or staff) per order, returns handling, customer-service load
- Both: the conversion difference — the Prime badge typically lifts conversion, and that difference can outweigh a small per-unit fee gap
💡 Hybrid Is Legitimate
Many sellers run both: FBA for the fast movers where the badge pays for itself, FBM for oversize or slow items. The calculator answers per product — run it per SKU, not once for your whole catalog.
How to Decide in Practice
1
Get your real FBA fee
Look up the exact fulfillment fee for your product's size tier and weight in Seller Central — don't estimate from someone else's product.
2
Price your own fulfillment honestly
Postage + box + filler + label + minutes of labor per order. If you'd hire help, use their wage, not zero.
3
Run both through the calculator
Enter the shared items once and both models' costs. The per-unit gap is your decision number.
4
Stress-test with Q4 storage
If the FBA gap is small, add per-unit Q4 storage cost — a small FBA edge can flip in the expensive season.
Add Storage Cost to the Picture
The free Storage Fee Calculator turns your dims and stock into a per-month cost you can fold into the FBA side.