Kalkulator opłat Amazon FBA — Darmowe narzędzie online

Amazon FBA Fee Kalkulator: Know Your True Profit Before You Source

Selling on Amazon through Fulfillment by Amazon (FBA) is one of the most popular e-commerce business models, but the fee structure is notoriously complex. Between referral fees, fulfillment fees, storage fees, and your product costs, it is easy to think you are making money when you are actually losing it. This calculator breaks down every fee so you know your exact profit per unit before you place a single order with your supplier.

Understanding Amazon FBA Fees

Amazon charges three main categories of fees for FBA sellers. The referral fee is a percentage of the sale price that Amazon takes as commission. For most categories, this is 15%, but it ranges from 6% (personal computers) to 45% (Amazon device accessories). The fulfillment fee covers the cost of Amazon picking your product from their warehouse, packing it, and shipping it to the customer. This fee depends on the product's size tier and weight. Finally, the monthly storage fee is charged per cubic foot of warehouse space your inventory occupies.

Size Tiers Explained

Amazon classifies all products into size tiers that directly affect fulfillment costs. Small Standard items (under 15 x 12 x 0.75 inches, under 1 lb) have the lowest fees, typically around $3.22 per unit. Large Standard items (up to 18 x 14 x 8 inches, up to 20 lb) cost more, starting around $4.75 and increasing with weight. Once your product crosses into Oversize territory, fees jump significantly — Small Oversize starts at approximately $9.73, and Large Oversize at $89.98. Understanding which tier your product falls into is critical for pricing decisions.

The Hidden Koszts of FBA

Beyond the three main fees, successful FBA sellers budget for several additional costs. Amazon PPC advertising typically consumes 10-25% of revenue for competitive products. Return processing fees apply when customers return items (especially in apparel). Long-term storage fees kick in for inventory sitting in warehouses over 271 days. And the often-overlooked removal/disposal fees apply when you need to clear unsold inventory. A realistic total fee burden for most FBA sellers is 35-50% of the selling price.

How to Use This Kalkulator Effectively

Start with your real numbers. Get actual quotes from your supplier for product cost and shipping to FBA. Do not estimate — a $0.50 difference in product cost changes your margin by 5% or more on a $10 item. For dimensions, measure the packaged product (including any packaging materials and poly bags), not just the product itself. Amazon measures the packaged unit, and even a fraction of an inch can push you into a higher size tier.

Use the ROI metric to compare different product opportunities. A product with $5 profit but $2 total cost (250% ROI) is a better investment than a product with $8 profit but $15 total cost (53% ROI), assuming similar sales velocity. The break-even units per month calculation helps you determine the minimum sales volume needed to cover your fixed costs like Amazon's monthly professional seller subscription ($39.99/month).

Profit Margin Benchmarks

Industry benchmarks suggest targeting a minimum 25-30% net profit margin after all FBA fees. Below 20%, you have very little buffer for advertising costs, returns, and market fluctuations. Above 40% is excellent but rare in competitive categories. Products with very high margins usually exist in niches with lower competition and higher barriers to entry (custom products, patented items, established brands).

The most common mistake new FBA sellers make is choosing products based on revenue potential rather than margin. A $50 product with 10% margin ($5 profit) requires twice the advertising budget and inventory investment of a $25 product with 30% margin ($7.50 profit). Always optimize for margin first, then scale volume.

When FBA Makes Sense vs. FBM

FBA is not always the best choice. For lightweight, high-margin products that sell consistently, FBA provides excellent value through Prime eligibility and hands-off fulfillment. But for heavy, bulky, or slow-moving products, the fulfillment and storage fees can eat your entire margin. Consider Fulfilled by Merchant (FBM) for oversize items, seasonal products, or items with very low margins where you can ship more cost-effectively yourself.