How to Use This Tool
Adding 18 percent to a target payout does not undo an 18 percent fee. The fee is calculated from the larger listing price, so the correct reverse formula divides the desired payout plus fixed fees by the share you retain. With 17.9 percent in percentage fees, the retained share is 82.1 percent.
Why a simple markup misses
If you need thirty dollars and add 17.9 percent, you list at $35.37. Percentage fees on that price plus the fixed charge leave less than thirty dollars. Reverse pricing solves the equation once, then runs the result forward through the same fee model as a cross-check.
Match the platform's fee base
This model assumes all percentage inputs apply to listing price. Real marketplaces may charge commission on shipping, buyer-paid tax, discounts or other amounts while payment fees use another base. Combine only fees that share the same base; otherwise treat the result as a planning price and verify it against the platform's current fee statement.
Sources & assumptions
Tool Spec v2 · verified 2026-08-18. Platform rules and fees can change; the editable inputs remain authoritative for your account.
Official references
- US SBA — price products and services (checked 2026-08-18)
Model assumptions
- Every entered percentage fee applies to the same listing-price base; platforms may use different bases for tax, shipping or promotions.
- The calculator does not round to marketplace price endings or include tax collected from the buyer.
