What this Amazon FBA calculator includes
The estimate combines the referral fee with the 2026 non-apparel FBA fulfillment rate for your size, weight, and selling-price band. For standard-size products, it can check the packaged dimensions against the small- and large-standard limits. The optional fuel surcharge is applied to fulfillment—not to the item price.
Important: this is a planning estimate, not a payout quote. Storage and returns are seller-entered allowances, not Amazon rate calculations. The model excludes aged inventory, low-inventory, placement, removal, refund administration, dimensional-weight adjustments, and account-specific exceptions. Confirm a live SKU in Amazon’s Revenue Calculator.
Common 2026 fee inputs
| Input | Model used here | What can change it |
|---|---|---|
| Referral fee | Usually 15%; selected categories vary | Category and selling-price thresholds |
| Standard-size check | Small: up to 15 × 12 × 0.75 in and 16 oz; large: up to 18 × 14 × 8 in and 20 lb | Amazon’s measured packaged dimensions and shipping weight |
| FBA fulfillment | 2026 non-apparel size/weight schedule | Price band, size tier, shipping weight, apparel status |
| Fuel surcharge | 3.5% of fulfillment fee | Amazon may revise or remove a temporary surcharge |
| Ads | Your per-sale input | ACoS, attribution, and organic share |
Two quick examples
An 8 oz product with $8 cost, $2.50 ads, and $1.20 inbound cost keeps much less than “price minus 15%.” Fulfillment is usually the second large deduction.
Lower FBA price bands can help, but a fixed fulfillment cost still takes a large share. Small price changes can move the product into a different band.
Amazon FBA calculator FAQ
Is this Amazon’s official Revenue Calculator?
No. FreeFindy is independent. Use this for quick scenario planning, then confirm your ASIN in Amazon’s own tool before buying inventory.
How does automatic size detection work?
The tool sorts the three packaged dimensions and checks the longest, median, and shortest side plus shipping weight against the standard-size limits. Packages outside those limits require a manually confirmed bulky tier.
Does this calculate dimensional weight?
No. Enter the shipping weight Amazon uses for the SKU. Dimensional weight can apply above certain weights and in bulky tiers, so confirm Amazon’s measurement before relying on the result.
What is break-even ACoS?
It is the percentage of selling price that could be spent on attributed ads before modeled profit reaches zero. It is a ceiling, not a recommended target, because refunds and unmodeled costs need room.
Does the referral fee include tax?
Amazon generally calculates the referral fee on the total sales price excluding taxes calculated through Amazon tax services. This tool models it on the entered item price.
Why does the FBA fee change when the selling price changes?
Amazon’s 2026 standard-size schedule includes price bands. The same packaged product can therefore have a different fulfillment fee below $10, from $10–$50, or above $50.
Should I include the fuel surcharge?
Yes for sales during the surcharge period. Amazon announced a 3.5% surcharge on FBA fulfillment fees from 17 April 2026. Leave the box clear only for an earlier or no-surcharge scenario.
Does this include monthly storage?
Enter a per-sale storage allowance if you have one. The tool does not calculate monthly storage because the fee depends on occupied volume, season, inventory age, and utilization.
Comparing channels? Run the same product through the Amazon vs Etsy vs eBay profit calculator.