Which fees can be difficult to calculate without an Amazon calculator?

Fulfilled by Amazon (FBA) fees are complex because they involve multiple components, such as fulfillment fees (based on product size and weight), storage fees (monthly and long-term), referral fees, and potentially other charges like removal or disposal fees. These fees can vary significantly based on product dimensions, weight, storage duration, and sales velocity, making manual calculation challenging and prone to error. An Amazon calculator simplifies this by integrating all these variables to provide an accurate estimate. Seller Fulfilled Prime fees and Merchant Fulfilled fees are generally easier to calculate as they primarily involve a referral fee percentage and the seller's own shipping costs, which are typically more straightforward to determine.